* [PATCH] hwmon: coretemp: fix oops on cpu unplug
@ 2012-04-30 13:18 Kirill A. Shutemov
2012-04-30 15:28 ` Guenter Roeck
2012-05-01 15:20 ` Guenter Roeck
0 siblings, 2 replies; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-04-30 13:18 UTC (permalink / raw)
To: Fenghua Yu
Cc: Andi Kleen, Jean Delvare, Guenter Roeck, lm-sensors,
linux-kernel, Kirill A. Shutemov
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
coretemp tries to access core_data array beyond bounds on cpu unplug if
core id of the cpu if more than NUM_REAL_CORES-1.
BUG: unable to handle kernel NULL pointer dereference at 000000000000013c
IP: [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
PGD 673e5a067 PUD 66e9b3067 PMD 0
Oops: 0000 [#1] SMP
CPU 79
Modules linked in: sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bnep bluetooth rfkill ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter nf_conntrack_ipv4 nf_defrag_ipv4 ip6_tables xt_state nf_conntrack coretemp crc32c_intel asix tpm_tis pcspkr usbnet iTCO_wdt i2c_i801 microcode mii joydev tpm i2c_core iTCO_vendor_support tpm_bios i7core_edac igb ioatdma edac_core dca megaraid_sas [last unloaded: oprofile]
Pid: 3315, comm: set-cpus Tainted: G W 3.4.0-rc5+ #2 QCI QSSC-S4R/QSSC-S4R
RIP: 0010:[<ffffffffa00159af>] [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
RSP: 0018:ffff880472fb3d48 EFLAGS: 00010246
RAX: 0000000000000124 RBX: 0000000000000034 RCX: 00000000ffffffff
RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000246
RBP: ffff880472fb3d88 R08: ffff88077fcd36c0 R09: 0000000000000001
R10: ffffffff8184bc48 R11: 0000000000000000 R12: ffff880273095800
R13: 0000000000000013 R14: ffff8802730a1810 R15: 0000000000000000
FS: 00007f694a20f720(0000) GS:ffff88077fcc0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 000000000000013c CR3: 000000067209b000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process set-cpus (pid: 3315, threadinfo ffff880472fb2000, task ffff880471fa0000)
Stack:
ffff880277b4c308 0000000000000003 ffff880472fb3d88 0000000000000005
0000000000000034 00000000ffffffd1 ffffffff81cadc70 ffff880472fb3e14
ffff880472fb3dc8 ffffffff8161f48d ffff880471fa0000 0000000000000034
Call Trace:
[<ffffffff8161f48d>] notifier_call_chain+0x4d/0x70
[<ffffffff8107f1be>] __raw_notifier_call_chain+0xe/0x10
[<ffffffff81059d30>] __cpu_notify+0x20/0x40
[<ffffffff815fa251>] _cpu_down+0x81/0x270
[<ffffffff815fa477>] cpu_down+0x37/0x50
[<ffffffff815fd6a3>] store_online+0x63/0xc0
[<ffffffff813c7078>] dev_attr_store+0x18/0x30
[<ffffffff811f02cf>] sysfs_write_file+0xef/0x170
[<ffffffff81180443>] vfs_write+0xb3/0x180
[<ffffffff8118076a>] sys_write+0x4a/0x90
[<ffffffff816236a9>] system_call_fastpath+0x16/0x1b
Code: 48 c7 c7 94 60 01 a0 44 0f b7 ac 10 ac 00 00 00 31 c0 e8 41 b7 5f e1 41 83 c5 02 49 63 c5 49 8b 44 c4 10 48 85 c0 74 56 45 31 ff <39> 58 18 75 4e eb 1f 49 63 d7 4c 89 f7 48 89 45 c8 48 6b d2 28
RIP [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
RSP <ffff880472fb3d48>
CR2: 000000000000013c
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/hwmon/coretemp.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 0d3141f..54a70fe 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -709,6 +709,10 @@ static void __cpuinit put_core_offline(unsigned int cpu)
indx = TO_ATTR_NO(cpu);
+ /* The core id is too big, just return */
+ if (indx > MAX_CORE_DATA - 1)
+ return;
+
if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
coretemp_remove_core(pdata, &pdev->dev, indx);
--
1.7.9.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-04-30 13:18 [PATCH] hwmon: coretemp: fix oops on cpu unplug Kirill A. Shutemov
@ 2012-04-30 15:28 ` Guenter Roeck
2012-04-30 16:19 ` Kirill A. Shutemov
2012-05-01 15:20 ` Guenter Roeck
1 sibling, 1 reply; 15+ messages in thread
From: Guenter Roeck @ 2012-04-30 15:28 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Mon, 2012-04-30 at 09:18 -0400, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> coretemp tries to access core_data array beyond bounds on cpu unplug if
> core id of the cpu if more than NUM_REAL_CORES-1.
>
> BUG: unable to handle kernel NULL pointer dereference at 000000000000013c
> IP: [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
> PGD 673e5a067 PUD 66e9b3067 PMD 0
> Oops: 0000 [#1] SMP
> CPU 79
> Modules linked in: sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bnep bluetooth rfkill ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter nf_conntrack_ipv4 nf_defrag_ipv4 ip6_tables xt_state nf_conntrack coretemp crc32c_intel asix tpm_tis pcspkr usbnet iTCO_wdt i2c_i801 microcode mii joydev tpm i2c_core iTCO_vendor_support tpm_bios i7core_edac igb ioatdma edac_core dca megaraid_sas [last unloaded: oprofile]
>
> Pid: 3315, comm: set-cpus Tainted: G W 3.4.0-rc5+ #2 QCI QSSC-S4R/QSSC-S4R
> RIP: 0010:[<ffffffffa00159af>] [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
> RSP: 0018:ffff880472fb3d48 EFLAGS: 00010246
> RAX: 0000000000000124 RBX: 0000000000000034 RCX: 00000000ffffffff
> RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000246
> RBP: ffff880472fb3d88 R08: ffff88077fcd36c0 R09: 0000000000000001
> R10: ffffffff8184bc48 R11: 0000000000000000 R12: ffff880273095800
> R13: 0000000000000013 R14: ffff8802730a1810 R15: 0000000000000000
> FS: 00007f694a20f720(0000) GS:ffff88077fcc0000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 000000000000013c CR3: 000000067209b000 CR4: 00000000000007e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process set-cpus (pid: 3315, threadinfo ffff880472fb2000, task ffff880471fa0000)
> Stack:
> ffff880277b4c308 0000000000000003 ffff880472fb3d88 0000000000000005
> 0000000000000034 00000000ffffffd1 ffffffff81cadc70 ffff880472fb3e14
> ffff880472fb3dc8 ffffffff8161f48d ffff880471fa0000 0000000000000034
> Call Trace:
> [<ffffffff8161f48d>] notifier_call_chain+0x4d/0x70
> [<ffffffff8107f1be>] __raw_notifier_call_chain+0xe/0x10
> [<ffffffff81059d30>] __cpu_notify+0x20/0x40
> [<ffffffff815fa251>] _cpu_down+0x81/0x270
> [<ffffffff815fa477>] cpu_down+0x37/0x50
> [<ffffffff815fd6a3>] store_online+0x63/0xc0
> [<ffffffff813c7078>] dev_attr_store+0x18/0x30
> [<ffffffff811f02cf>] sysfs_write_file+0xef/0x170
> [<ffffffff81180443>] vfs_write+0xb3/0x180
> [<ffffffff8118076a>] sys_write+0x4a/0x90
> [<ffffffff816236a9>] system_call_fastpath+0x16/0x1b
> Code: 48 c7 c7 94 60 01 a0 44 0f b7 ac 10 ac 00 00 00 31 c0 e8 41 b7 5f e1 41 83 c5 02 49 63 c5 49 8b 44 c4 10 48 85 c0 74 56 45 31 ff <39> 58 18 75 4e eb 1f 49 63 d7 4c 89 f7 48 89 45 c8 48 6b d2 28
> RIP [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp]
> RSP <ffff880472fb3d48>
> CR2: 000000000000013c
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> ---
> drivers/hwmon/coretemp.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 0d3141f..54a70fe 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -709,6 +709,10 @@ static void __cpuinit put_core_offline(unsigned int cpu)
>
> indx = TO_ATTR_NO(cpu);
>
> + /* The core id is too big, just return */
> + if (indx > MAX_CORE_DATA - 1)
> + return;
> +
> if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
> coretemp_remove_core(pdata, &pdev->dev, indx);
>
Hi,
good catch. Couple of problems, though.
First, what number of cores are we talking about ? We should probably
increase NUM_REAL_CORES as well. Long term, we should get rid of the
dependency to prevent that problem from happening again, but that is a
different issue.
Second, we'll need the same code in get_core_online(). Otherwise the
platform device can be created for the new core (if the core is
re-enabled) but will never be deleted.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-04-30 15:28 ` Guenter Roeck
@ 2012-04-30 16:19 ` Kirill A. Shutemov
2012-04-30 16:59 ` Guenter Roeck
0 siblings, 1 reply; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-04-30 16:19 UTC (permalink / raw)
To: Guenter Roeck
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Mon, Apr 30, 2012 at 08:28:10AM -0700, Guenter Roeck wrote:
> Hi,
>
> good catch. Couple of problems, though.
>
> First, what number of cores are we talking about ? We should probably
> increase NUM_REAL_CORES as well. Long term, we should get rid of the
> dependency to prevent that problem from happening again, but that is a
> different issue.
It triggered by another bug. Cores on my 10-core processor have ids 0, 1,
2, 8, 9, 16, 17, 18, 24, 25. :-/
No need to change NUM_REAL_CORES at the moment.
> Second, we'll need the same code in get_core_online(). Otherwise the
> platform device can be created for the new core (if the core is
> re-enabled) but will never be deleted.
It has already handled in create_core_data().
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-04-30 16:19 ` Kirill A. Shutemov
@ 2012-04-30 16:59 ` Guenter Roeck
0 siblings, 0 replies; 15+ messages in thread
From: Guenter Roeck @ 2012-04-30 16:59 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Mon, 2012-04-30 at 12:19 -0400, Kirill A. Shutemov wrote:
> On Mon, Apr 30, 2012 at 08:28:10AM -0700, Guenter Roeck wrote:
> > Hi,
> >
> > good catch. Couple of problems, though.
> >
> > First, what number of cores are we talking about ? We should probably
> > increase NUM_REAL_CORES as well. Long term, we should get rid of the
> > dependency to prevent that problem from happening again, but that is a
> > different issue.
>
> It triggered by another bug. Cores on my 10-core processor have ids 0, 1,
> 2, 8, 9, 16, 17, 18, 24, 25. :-/
> No need to change NUM_REAL_CORES at the moment.
>
The problem, though, is that core_data[] is indexed by the core ID. So,
NUM_REAL_CORES is a bit misleading. It should probably be named
NUM_CORE_ID or something similar.
> > Second, we'll need the same code in get_core_online(). Otherwise the
> > platform device can be created for the new core (if the core is
> > re-enabled) but will never be deleted.
>
> It has already handled in create_core_data().
>
... which is called from coretemp_add_core(), which does not return an
error. Besides, it is called after the call to coretemp_device_add().
As a result, the platform device for the unsupported core(s) will be
created, even if the core is not supported. I just don't think that is a
good idea.
Besides, if you'd have the check in get_core_online(), you would not
even hit the problem in put_core_offline(), since the platform device
would not exist and the function would bail out because of that.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-04-30 13:18 [PATCH] hwmon: coretemp: fix oops on cpu unplug Kirill A. Shutemov
2012-04-30 15:28 ` Guenter Roeck
@ 2012-05-01 15:20 ` Guenter Roeck
2012-05-01 21:00 ` Kirill A. Shutemov
1 sibling, 1 reply; 15+ messages in thread
From: Guenter Roeck @ 2012-05-01 15:20 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Mon, Apr 30, 2012 at 09:18:01AM -0400, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> coretemp tries to access core_data array beyond bounds on cpu unplug if
> core id of the cpu if more than NUM_REAL_CORES-1.
>
[ ... ]
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Looking at it again, you were right. Adding the check to get_core_online()
doesn't really help as the platform device is per CPU, not per core.
Applied. I'll submit a separate patch to increase NUM_REAL_CORES.
Guenter
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-05-01 15:20 ` Guenter Roeck
@ 2012-05-01 21:00 ` Kirill A. Shutemov
2012-05-01 21:25 ` Guenter Roeck
0 siblings, 1 reply; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-01 21:00 UTC (permalink / raw)
To: Guenter Roeck
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Tue, May 01, 2012 at 08:20:14AM -0700, Guenter Roeck wrote:
> On Mon, Apr 30, 2012 at 09:18:01AM -0400, Kirill A. Shutemov wrote:
> > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> >
> > coretemp tries to access core_data array beyond bounds on cpu unplug if
> > core id of the cpu if more than NUM_REAL_CORES-1.
> >
> [ ... ]
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
>
> Looking at it again, you were right. Adding the check to get_core_online()
> doesn't really help as the platform device is per CPU, not per core.
>
> Applied. I'll submit a separate patch to increase NUM_REAL_CORES.
Actually, the problem is bigger.
Documentation/cputopology.txt:
====
2) /sys/devices/system/cpu/cpuX/topology/core_id:
the CPU core ID of cpuX. Typically it is the hardware platform's
identifier (rather than the kernel's). The actual value is
architecture and platform dependent.
====
We should not use core id as an index in an array since it's an arbitrary
number (from kernel POV).
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH] hwmon: coretemp: fix oops on cpu unplug
2012-05-01 21:00 ` Kirill A. Shutemov
@ 2012-05-01 21:25 ` Guenter Roeck
2012-05-02 15:10 ` [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data Kirill A. Shutemov
0 siblings, 1 reply; 15+ messages in thread
From: Guenter Roeck @ 2012-05-01 21:25 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Andi Kleen, Jean Delvare, lm-sensors, linux-kernel
On Tue, May 01, 2012 at 05:00:41PM -0400, Kirill A. Shutemov wrote:
> On Tue, May 01, 2012 at 08:20:14AM -0700, Guenter Roeck wrote:
> > On Mon, Apr 30, 2012 at 09:18:01AM -0400, Kirill A. Shutemov wrote:
> > > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> > >
> > > coretemp tries to access core_data array beyond bounds on cpu unplug if
> > > core id of the cpu if more than NUM_REAL_CORES-1.
> > >
> > [ ... ]
> > >
> > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> >
> > Looking at it again, you were right. Adding the check to get_core_online()
> > doesn't really help as the platform device is per CPU, not per core.
> >
> > Applied. I'll submit a separate patch to increase NUM_REAL_CORES.
>
> Actually, the problem is bigger.
>
> Documentation/cputopology.txt:
> ====
> 2) /sys/devices/system/cpu/cpuX/topology/core_id:
>
> the CPU core ID of cpuX. Typically it is the hardware platform's
> identifier (rather than the kernel's). The actual value is
> architecture and platform dependent.
> ====
>
> We should not use core id as an index in an array since it's an arbitrary
> number (from kernel POV).
>
Yes, we know we'll need a better fix going forward. Using a fixed size array is bad,
no matter what context.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-01 21:25 ` Guenter Roeck
@ 2012-05-02 15:10 ` Kirill A. Shutemov
2012-05-03 5:29 ` [lm-sensors] " R, Durgadoss
2012-05-03 11:18 ` [PATCH, v2] " Kirill A. Shutemov
0 siblings, 2 replies; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-02 15:10 UTC (permalink / raw)
To: Fenghua Yu, Guenter Roeck
Cc: Andi Kleen, Jean Delvare, lm-sensors, linux-kernel, Kirill A. Shutemov
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Let's rework code to allow arbitrary number of cores on a CPU, not
limited by hardcoded array size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/hwmon/coretemp.c | 176 +++++++++++++++++++++++++++++++++-------------
1 files changed, 127 insertions(+), 49 deletions(-)
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 54a70fe..f5f9108 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -36,6 +36,8 @@
#include <linux/cpu.h>
#include <linux/pci.h>
#include <linux/smp.h>
+#include <linux/list.h>
+#include <linux/kref.h>
#include <linux/moduleparam.h>
#include <asm/msr.h>
#include <asm/processor.h>
@@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
-#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
#define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
-#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
#define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
@@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
* @valid: If this is 1, the current temperature is valid.
*/
struct temp_data {
+ struct list_head list;
+ struct kref refcount;
+ int id;
int temp;
int ttarget;
int tjmax;
@@ -101,7 +104,8 @@ struct temp_data {
struct platform_data {
struct device *hwmon_dev;
u16 phys_proc_id;
- struct temp_data *core_data[MAX_CORE_DATA];
+ struct list_head temp_data_list;
+ spinlock_t temp_data_lock;
struct device_attribute name_attr;
};
@@ -114,6 +118,29 @@ struct pdev_entry {
static LIST_HEAD(pdev_list);
static DEFINE_MUTEX(pdev_list_mutex);
+static void temp_data_release(struct kref *ref)
+{
+ struct temp_data *tdata = container_of(ref, struct temp_data, refcount);
+
+ kfree(tdata);
+}
+
+static struct temp_data *get_temp_data(struct platform_data *pdata, int id)
+{
+ struct temp_data *tdata;
+
+ spin_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list)
+ if (tdata->id == id) {
+ kref_get(&tdata->refcount);
+ goto out;
+ }
+ tdata = NULL;
+out:
+ spin_unlock(&pdata->temp_data_lock);
+ return tdata;
+}
+
static ssize_t show_name(struct device *dev,
struct device_attribute *devattr, char *buf)
{
@@ -125,12 +152,19 @@ static ssize_t show_label(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
if (tdata->is_pkg_data)
- return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
+ ret = sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
+ else
+ ret = sprintf(buf, "Core %u\n", tdata->cpu_core_id);
- return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_crit_alarm(struct device *dev,
@@ -139,11 +173,18 @@ static ssize_t show_crit_alarm(struct device *dev,
u32 eax, edx;
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
- return sprintf(buf, "%d\n", (eax >> 5) & 1);
+ ret = sprintf(buf, "%d\n", (eax >> 5) & 1);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_tjmax(struct device *dev,
@@ -151,8 +192,16 @@ static ssize_t show_tjmax(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
+
+ ret = sprintf(buf, "%d\n", tdata->tjmax);
- return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_ttarget(struct device *dev,
@@ -160,8 +209,16 @@ static ssize_t show_ttarget(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
- return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
+ if (!tdata)
+ return -ENOENT;
+
+ ret = sprintf(buf, "%d\n", tdata->ttarget);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_temp(struct device *dev,
@@ -170,7 +227,11 @@ static ssize_t show_temp(struct device *dev,
u32 eax, edx;
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret = -EAGAIN;
+
+ if (!tdata)
+ return -ENOENT;
mutex_lock(&tdata->update_lock);
@@ -188,7 +249,12 @@ static ssize_t show_temp(struct device *dev,
}
mutex_unlock(&tdata->update_lock);
- return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
+
+ if (tdata->valid)
+ ret = sprintf(buf, "%d\n", tdata->temp);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id,
@@ -412,6 +478,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
if (!tdata)
return NULL;
+ kref_init(&tdata->refcount);
tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
MSR_IA32_THERM_STATUS;
@@ -423,7 +490,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
return tdata;
}
-static int __cpuinit create_core_data(struct platform_device *pdev,
+static int __cpuinit create_temp_data(struct platform_device *pdev,
unsigned int cpu, int pkg_flag)
{
struct temp_data *tdata;
@@ -440,9 +507,6 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
*/
attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
- if (attr_no > MAX_CORE_DATA - 1)
- return -ERANGE;
-
/*
* Provide a single set of attributes for all HT siblings of a core
* to avoid duplicate sensors (the processor ID and core ID of all
@@ -450,8 +514,14 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
* Skip if a HT sibling of this core is already registered.
* This is not an error.
*/
- if (pdata->core_data[attr_no] != NULL)
- return 0;
+ spin_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list) {
+ if (tdata->id == attr_no) {
+ spin_unlock(&pdata->temp_data_lock);
+ return 0;
+ }
+ }
+ spin_unlock(&pdata->temp_data_lock);
tdata = init_temp_data(cpu, pkg_flag);
if (!tdata)
@@ -480,16 +550,23 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
}
}
- pdata->core_data[attr_no] = tdata;
+ tdata->id = attr_no;
+
+ spin_lock(&pdata->temp_data_lock);
+ list_add(&tdata->list, &pdata->temp_data_list);
+ spin_unlock(&pdata->temp_data_lock);
/* Create sysfs interfaces */
err = create_core_attrs(tdata, &pdev->dev, attr_no);
if (err)
- goto exit_free;
+ goto exit_list_del;
return 0;
+exit_list_del:
+ spin_lock(&pdata->temp_data_lock);
+ list_del(&tdata->list);
+ spin_unlock(&pdata->temp_data_lock);
exit_free:
- pdata->core_data[attr_no] = NULL;
kfree(tdata);
return err;
}
@@ -502,23 +579,21 @@ static void __cpuinit coretemp_add_core(unsigned int cpu, int pkg_flag)
if (!pdev)
return;
- err = create_core_data(pdev, cpu, pkg_flag);
+ err = create_temp_data(pdev, cpu, pkg_flag);
if (err)
dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
}
-static void coretemp_remove_core(struct platform_data *pdata,
- struct device *dev, int indx)
+static void coretemp_remove_core(struct temp_data *tdata, struct device *dev)
{
int i;
- struct temp_data *tdata = pdata->core_data[indx];
/* Remove the sysfs attributes */
for (i = 0; i < tdata->attr_size; i++)
device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
- kfree(pdata->core_data[indx]);
- pdata->core_data[indx] = NULL;
+ list_del(&tdata->list);
+ kref_put(&tdata->refcount, temp_data_release);
}
static int __devinit coretemp_probe(struct platform_device *pdev)
@@ -536,6 +611,8 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
goto exit_free;
pdata->phys_proc_id = pdev->id;
+ INIT_LIST_HEAD(&pdata->temp_data_list);
+ spin_lock_init(&pdata->temp_data_lock);
platform_set_drvdata(pdev, pdata);
pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
@@ -557,11 +634,12 @@ exit_free:
static int __devexit coretemp_remove(struct platform_device *pdev)
{
struct platform_data *pdata = platform_get_drvdata(pdev);
- int i;
+ struct temp_data *cur, *tmp;
- for (i = MAX_CORE_DATA - 1; i >= 0; --i)
- if (pdata->core_data[i])
- coretemp_remove_core(pdata, &pdev->dev, i);
+ spin_lock(&pdata->temp_data_lock);
+ list_for_each_entry_safe(cur, tmp, &pdata->temp_data_list, list)
+ coretemp_remove_core(cur, &pdev->dev);
+ spin_unlock(&pdata->temp_data_lock);
device_remove_file(&pdev->dev, &pdata->name_attr);
hwmon_device_unregister(pdata->hwmon_dev);
@@ -641,16 +719,17 @@ static void __cpuinit coretemp_device_remove(unsigned int cpu)
static bool __cpuinit is_any_core_online(struct platform_data *pdata)
{
- int i;
-
- /* Find online cores, except pkgtemp data */
- for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
- if (pdata->core_data[i] &&
- !pdata->core_data[i]->is_pkg_data) {
- return true;
- }
- }
- return false;
+ struct temp_data *tdata;
+ bool ret = true;
+
+ spin_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list)
+ if (!tdata->is_pkg_data)
+ goto out;
+ ret = false;
+out:
+ spin_unlock(&pdata->temp_data_lock);
+ return ret;
}
static void __cpuinit get_core_online(unsigned int cpu)
@@ -697,9 +776,10 @@ static void __cpuinit get_core_online(unsigned int cpu)
static void __cpuinit put_core_offline(unsigned int cpu)
{
- int i, indx;
+ int i, attr_no;
struct platform_data *pdata;
struct platform_device *pdev = coretemp_get_pdev(cpu);
+ struct temp_data *tdata;
/* If the physical CPU device does not exist, just return */
if (!pdev)
@@ -707,14 +787,12 @@ static void __cpuinit put_core_offline(unsigned int cpu)
pdata = platform_get_drvdata(pdev);
- indx = TO_ATTR_NO(cpu);
-
- /* The core id is too big, just return */
- if (indx > MAX_CORE_DATA - 1)
- return;
+ attr_no = TO_ATTR_NO(cpu);
- if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
- coretemp_remove_core(pdata, &pdev->dev, indx);
+ tdata = get_temp_data(pdata, attr_no);
+ if (tdata->cpu == cpu)
+ coretemp_remove_core(tdata, &pdev->dev);
+ kref_put(&tdata->refcount, temp_data_release);
/*
* If a HT sibling of a core is taken offline, but another HT sibling
--
1.7.9.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* RE: [lm-sensors] [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-02 15:10 ` [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data Kirill A. Shutemov
@ 2012-05-03 5:29 ` R, Durgadoss
2012-05-03 10:04 ` Kirill A. Shutemov
2012-05-03 11:18 ` [PATCH, v2] " Kirill A. Shutemov
1 sibling, 1 reply; 15+ messages in thread
From: R, Durgadoss @ 2012-05-03 5:29 UTC (permalink / raw)
To: Kirill A. Shutemov, Yu, Fenghua, Guenter Roeck
Cc: Andi Kleen, linux-kernel, lm-sensors
Hi,
> -----Original Message-----
> From: lm-sensors-bounces@lm-sensors.org [mailto:lm-sensors-bounces@lm-
> sensors.org] On Behalf Of Kirill A. Shutemov
> Sent: Wednesday, May 02, 2012 8:41 PM
> To: Yu, Fenghua; Guenter Roeck
> Cc: Andi Kleen; linux-kernel@vger.kernel.org; Kirill A. Shutemov; lm-sensors@lm-
> sensors.org
> Subject: [lm-sensors] [PATCH] hwmon: coretemp: use list instead of fixed size
> array for temp data
>
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> Let's rework code to allow arbitrary number of cores on a CPU, not
> limited by hardcoded array size.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> ---
> drivers/hwmon/coretemp.c | 176 +++++++++++++++++++++++++++++++++---
> ----------
> 1 files changed, 127 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 54a70fe..f5f9108 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -36,6 +36,8 @@
> #include <linux/cpu.h>
> #include <linux/pci.h>
> #include <linux/smp.h>
> +#include <linux/list.h>
> +#include <linux/kref.h>
> #include <linux/moduleparam.h>
> #include <asm/msr.h>
> #include <asm/processor.h>
> @@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
> MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
>
> #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp
> */
> -#define NUM_REAL_CORES 16 /* Number of Real cores per cpu
> */
> #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
> #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
> #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
> -#define MAX_CORE_DATA (NUM_REAL_CORES +
> BASE_SYSFS_ATTR_NO)
>
> #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
> #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
> @@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees
> Celsius");
> * @valid: If this is 1, the current temperature is valid.
> */
> struct temp_data {
> + struct list_head list;
> + struct kref refcount;
> + int id;
> int temp;
> int ttarget;
> int tjmax;
> @@ -101,7 +104,8 @@ struct temp_data {
> struct platform_data {
> struct device *hwmon_dev;
> u16 phys_proc_id;
> - struct temp_data *core_data[MAX_CORE_DATA];
> + struct list_head temp_data_list;
> + spinlock_t temp_data_lock;
> struct device_attribute name_attr;
> };
>
> @@ -114,6 +118,29 @@ struct pdev_entry {
> static LIST_HEAD(pdev_list);
> static DEFINE_MUTEX(pdev_list_mutex);
>
> +static void temp_data_release(struct kref *ref)
> +{
> + struct temp_data *tdata = container_of(ref, struct temp_data, refcount);
> +
> + kfree(tdata);
> +}
> +
> +static struct temp_data *get_temp_data(struct platform_data *pdata, int id)
> +{
> + struct temp_data *tdata;
> +
> + spin_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list)
> + if (tdata->id == id) {
> + kref_get(&tdata->refcount);
> + goto out;
> + }
> + tdata = NULL;
> +out:
> + spin_unlock(&pdata->temp_data_lock);
> + return tdata;
> +}
> +
> static ssize_t show_name(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> @@ -125,12 +152,19 @@ static ssize_t show_label(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
>
> if (tdata->is_pkg_data)
> - return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
> + ret = sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
> + else
> + ret = sprintf(buf, "Core %u\n", tdata->cpu_core_id);
>
> - return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_crit_alarm(struct device *dev,
> @@ -139,11 +173,18 @@ static ssize_t show_crit_alarm(struct device *dev,
> u32 eax, edx;
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
>
> rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
>
> - return sprintf(buf, "%d\n", (eax >> 5) & 1);
> + ret = sprintf(buf, "%d\n", (eax >> 5) & 1);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_tjmax(struct device *dev,
> @@ -151,8 +192,16 @@ static ssize_t show_tjmax(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
> +
> + ret = sprintf(buf, "%d\n", tdata->tjmax);
>
> - return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_ttarget(struct device *dev,
> @@ -160,8 +209,16 @@ static ssize_t show_ttarget(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
>
> - return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
> + if (!tdata)
> + return -ENOENT;
> +
> + ret = sprintf(buf, "%d\n", tdata->ttarget);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_temp(struct device *dev,
> @@ -170,7 +227,11 @@ static ssize_t show_temp(struct device *dev,
> u32 eax, edx;
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret = -EAGAIN;
> +
> + if (!tdata)
> + return -ENOENT;
>
> mutex_lock(&tdata->update_lock);
>
> @@ -188,7 +249,12 @@ static ssize_t show_temp(struct device *dev,
> }
>
> mutex_unlock(&tdata->update_lock);
> - return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
> +
> + if (tdata->valid)
> + ret = sprintf(buf, "%d\n", tdata->temp);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id,
> @@ -412,6 +478,7 @@ static struct temp_data __cpuinit
> *init_temp_data(unsigned int cpu,
> tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
> if (!tdata)
> return NULL;
> + kref_init(&tdata->refcount);
>
> tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
>
> MSR_IA32_THERM_STATUS;
> @@ -423,7 +490,7 @@ static struct temp_data __cpuinit
> *init_temp_data(unsigned int cpu,
> return tdata;
> }
>
> -static int __cpuinit create_core_data(struct platform_device *pdev,
> +static int __cpuinit create_temp_data(struct platform_device *pdev,
> unsigned int cpu, int pkg_flag)
> {
> struct temp_data *tdata;
> @@ -440,9 +507,6 @@ static int __cpuinit create_core_data(struct
> platform_device *pdev,
> */
> attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
>
> - if (attr_no > MAX_CORE_DATA - 1)
> - return -ERANGE;
> -
> /*
> * Provide a single set of attributes for all HT siblings of a core
> * to avoid duplicate sensors (the processor ID and core ID of all
> @@ -450,8 +514,14 @@ static int __cpuinit create_core_data(struct
> platform_device *pdev,
> * Skip if a HT sibling of this core is already registered.
> * This is not an error.
> */
> - if (pdata->core_data[attr_no] != NULL)
> - return 0;
> + spin_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list) {
> + if (tdata->id == attr_no) {
> + spin_unlock(&pdata->temp_data_lock);
> + return 0;
> + }
> + }
> + spin_unlock(&pdata->temp_data_lock);
>
> tdata = init_temp_data(cpu, pkg_flag);
> if (!tdata)
> @@ -480,16 +550,23 @@ static int __cpuinit create_core_data(struct
> platform_device *pdev,
> }
> }
>
> - pdata->core_data[attr_no] = tdata;
> + tdata->id = attr_no;
> +
> + spin_lock(&pdata->temp_data_lock);
> + list_add(&tdata->list, &pdata->temp_data_list);
> + spin_unlock(&pdata->temp_data_lock);
>
> /* Create sysfs interfaces */
> err = create_core_attrs(tdata, &pdev->dev, attr_no);
> if (err)
> - goto exit_free;
> + goto exit_list_del;
>
> return 0;
> +exit_list_del:
> + spin_lock(&pdata->temp_data_lock);
> + list_del(&tdata->list);
> + spin_unlock(&pdata->temp_data_lock);
> exit_free:
> - pdata->core_data[attr_no] = NULL;
> kfree(tdata);
> return err;
> }
> @@ -502,23 +579,21 @@ static void __cpuinit coretemp_add_core(unsigned int
> cpu, int pkg_flag)
> if (!pdev)
> return;
>
> - err = create_core_data(pdev, cpu, pkg_flag);
> + err = create_temp_data(pdev, cpu, pkg_flag);
> if (err)
> dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
> }
>
> -static void coretemp_remove_core(struct platform_data *pdata,
> - struct device *dev, int indx)
> +static void coretemp_remove_core(struct temp_data *tdata, struct device
> *dev)
> {
> int i;
> - struct temp_data *tdata = pdata->core_data[indx];
>
> /* Remove the sysfs attributes */
> for (i = 0; i < tdata->attr_size; i++)
> device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
>
> - kfree(pdata->core_data[indx]);
> - pdata->core_data[indx] = NULL;
> + list_del(&tdata->list);
> + kref_put(&tdata->refcount, temp_data_release);
> }
>
> static int __devinit coretemp_probe(struct platform_device *pdev)
> @@ -536,6 +611,8 @@ static int __devinit coretemp_probe(struct
> platform_device *pdev)
> goto exit_free;
>
> pdata->phys_proc_id = pdev->id;
> + INIT_LIST_HEAD(&pdata->temp_data_list);
> + spin_lock_init(&pdata->temp_data_lock);
> platform_set_drvdata(pdev, pdata);
>
> pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
> @@ -557,11 +634,12 @@ exit_free:
> static int __devexit coretemp_remove(struct platform_device *pdev)
> {
> struct platform_data *pdata = platform_get_drvdata(pdev);
> - int i;
> + struct temp_data *cur, *tmp;
>
> - for (i = MAX_CORE_DATA - 1; i >= 0; --i)
> - if (pdata->core_data[i])
> - coretemp_remove_core(pdata, &pdev->dev, i);
> + spin_lock(&pdata->temp_data_lock);
> + list_for_each_entry_safe(cur, tmp, &pdata->temp_data_list, list)
> + coretemp_remove_core(cur, &pdev->dev);
> + spin_unlock(&pdata->temp_data_lock);
>
> device_remove_file(&pdev->dev, &pdata->name_attr);
> hwmon_device_unregister(pdata->hwmon_dev);
> @@ -641,16 +719,17 @@ static void __cpuinit
> coretemp_device_remove(unsigned int cpu)
>
> static bool __cpuinit is_any_core_online(struct platform_data *pdata)
> {
> - int i;
> -
> - /* Find online cores, except pkgtemp data */
> - for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
> - if (pdata->core_data[i] &&
> - !pdata->core_data[i]->is_pkg_data) {
> - return true;
> - }
> - }
> - return false;
> + struct temp_data *tdata;
> + bool ret = true;
> +
> + spin_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list)
> + if (!tdata->is_pkg_data)
> + goto out;
> + ret = false;
> +out:
> + spin_unlock(&pdata->temp_data_lock);
> + return ret;
> }
>
> static void __cpuinit get_core_online(unsigned int cpu)
> @@ -697,9 +776,10 @@ static void __cpuinit get_core_online(unsigned int cpu)
>
> static void __cpuinit put_core_offline(unsigned int cpu)
> {
> - int i, indx;
> + int i, attr_no;
> struct platform_data *pdata;
> struct platform_device *pdev = coretemp_get_pdev(cpu);
> + struct temp_data *tdata;
>
> /* If the physical CPU device does not exist, just return */
> if (!pdev)
> @@ -707,14 +787,12 @@ static void __cpuinit put_core_offline(unsigned int cpu)
>
> pdata = platform_get_drvdata(pdev);
>
> - indx = TO_ATTR_NO(cpu);
> -
> - /* The core id is too big, just return */
> - if (indx > MAX_CORE_DATA - 1)
> - return;
> + attr_no = TO_ATTR_NO(cpu);
>
> - if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
> - coretemp_remove_core(pdata, &pdev->dev, indx);
> + tdata = get_temp_data(pdata, attr_no);
> + if (tdata->cpu == cpu)
The get_temp_data can return a NULL. So, you might want to do,
if (tdata && tdata->cpu == cpu) to avoid a potential NULL ptr crash.
In general, why are we using spin_locks instead of mutex_locks,
for list manipulations .. ?
Thanks,
Durga
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [lm-sensors] [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-03 5:29 ` [lm-sensors] " R, Durgadoss
@ 2012-05-03 10:04 ` Kirill A. Shutemov
0 siblings, 0 replies; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-03 10:04 UTC (permalink / raw)
To: R, Durgadoss
Cc: Yu, Fenghua, Guenter Roeck, Andi Kleen, linux-kernel, lm-sensors
[-- Attachment #1: Type: text/plain, Size: 986 bytes --]
On Thu, May 03, 2012 at 05:29:43AM +0000, R, Durgadoss wrote:
> > @@ -707,14 +787,12 @@ static void __cpuinit put_core_offline(unsigned int cpu)
> >
> > pdata = platform_get_drvdata(pdev);
> >
> > - indx = TO_ATTR_NO(cpu);
> > -
> > - /* The core id is too big, just return */
> > - if (indx > MAX_CORE_DATA - 1)
> > - return;
> > + attr_no = TO_ATTR_NO(cpu);
> >
> > - if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
> > - coretemp_remove_core(pdata, &pdev->dev, indx);
> > + tdata = get_temp_data(pdata, attr_no);
> > + if (tdata->cpu == cpu)
>
> The get_temp_data can return a NULL. So, you might want to do,
> if (tdata && tdata->cpu == cpu) to avoid a potential NULL ptr crash.
Good catch, thanks.
> In general, why are we using spin_locks instead of mutex_locks,
> for list manipulations .. ?
I don't think it matters here. Contention is low and nobody sleeps, but
okay, I'll change it to mutex.
--
Kirill A. Shutemov
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH, v2] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-02 15:10 ` [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data Kirill A. Shutemov
2012-05-03 5:29 ` [lm-sensors] " R, Durgadoss
@ 2012-05-03 11:18 ` Kirill A. Shutemov
2012-05-04 5:41 ` Guenter Roeck
1 sibling, 1 reply; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-03 11:18 UTC (permalink / raw)
To: Fenghua Yu, Guenter Roeck, Durgadoss R
Cc: Andi Kleen, Jean Delvare, lm-sensors, linux-kernel, Kirill A. Shutemov
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Let's rework code to allow arbitrary number of cores on a CPU, not
limited by hardcoded array size.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
v2:
- fix NULL pointer dereference. Thanks to R, Durgadoss;
- use mutex instead of spinlock for list locking.
---
drivers/hwmon/coretemp.c | 178 +++++++++++++++++++++++++++++++++-------------
1 files changed, 129 insertions(+), 49 deletions(-)
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 54a70fe..1c66131 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -36,6 +36,8 @@
#include <linux/cpu.h>
#include <linux/pci.h>
#include <linux/smp.h>
+#include <linux/list.h>
+#include <linux/kref.h>
#include <linux/moduleparam.h>
#include <asm/msr.h>
#include <asm/processor.h>
@@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
-#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
#define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
-#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
#define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
@@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
* @valid: If this is 1, the current temperature is valid.
*/
struct temp_data {
+ struct list_head list;
+ struct kref refcount;
+ int id;
int temp;
int ttarget;
int tjmax;
@@ -101,7 +104,8 @@ struct temp_data {
struct platform_data {
struct device *hwmon_dev;
u16 phys_proc_id;
- struct temp_data *core_data[MAX_CORE_DATA];
+ struct list_head temp_data_list;
+ struct mutex temp_data_lock;
struct device_attribute name_attr;
};
@@ -114,6 +118,29 @@ struct pdev_entry {
static LIST_HEAD(pdev_list);
static DEFINE_MUTEX(pdev_list_mutex);
+static void temp_data_release(struct kref *ref)
+{
+ struct temp_data *tdata = container_of(ref, struct temp_data, refcount);
+
+ kfree(tdata);
+}
+
+static struct temp_data *get_temp_data(struct platform_data *pdata, int id)
+{
+ struct temp_data *tdata;
+
+ mutex_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list)
+ if (tdata->id == id) {
+ kref_get(&tdata->refcount);
+ goto out;
+ }
+ tdata = NULL;
+out:
+ mutex_unlock(&pdata->temp_data_lock);
+ return tdata;
+}
+
static ssize_t show_name(struct device *dev,
struct device_attribute *devattr, char *buf)
{
@@ -125,12 +152,19 @@ static ssize_t show_label(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
if (tdata->is_pkg_data)
- return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
+ ret = sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
+ else
+ ret = sprintf(buf, "Core %u\n", tdata->cpu_core_id);
- return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_crit_alarm(struct device *dev,
@@ -139,11 +173,18 @@ static ssize_t show_crit_alarm(struct device *dev,
u32 eax, edx;
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
- return sprintf(buf, "%d\n", (eax >> 5) & 1);
+ ret = sprintf(buf, "%d\n", (eax >> 5) & 1);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_tjmax(struct device *dev,
@@ -151,8 +192,16 @@ static ssize_t show_tjmax(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
+
+ if (!tdata)
+ return -ENOENT;
+
+ ret = sprintf(buf, "%d\n", tdata->tjmax);
- return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_ttarget(struct device *dev,
@@ -160,8 +209,16 @@ static ssize_t show_ttarget(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret;
- return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
+ if (!tdata)
+ return -ENOENT;
+
+ ret = sprintf(buf, "%d\n", tdata->ttarget);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static ssize_t show_temp(struct device *dev,
@@ -170,7 +227,11 @@ static ssize_t show_temp(struct device *dev,
u32 eax, edx;
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct platform_data *pdata = dev_get_drvdata(dev);
- struct temp_data *tdata = pdata->core_data[attr->index];
+ struct temp_data *tdata = get_temp_data(pdata, attr->index);
+ ssize_t ret = -EAGAIN;
+
+ if (!tdata)
+ return -ENOENT;
mutex_lock(&tdata->update_lock);
@@ -188,7 +249,12 @@ static ssize_t show_temp(struct device *dev,
}
mutex_unlock(&tdata->update_lock);
- return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
+
+ if (tdata->valid)
+ ret = sprintf(buf, "%d\n", tdata->temp);
+
+ kref_put(&tdata->refcount, temp_data_release);
+ return ret;
}
static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id,
@@ -412,6 +478,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
if (!tdata)
return NULL;
+ kref_init(&tdata->refcount);
tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
MSR_IA32_THERM_STATUS;
@@ -423,7 +490,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
return tdata;
}
-static int __cpuinit create_core_data(struct platform_device *pdev,
+static int __cpuinit create_temp_data(struct platform_device *pdev,
unsigned int cpu, int pkg_flag)
{
struct temp_data *tdata;
@@ -440,9 +507,6 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
*/
attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
- if (attr_no > MAX_CORE_DATA - 1)
- return -ERANGE;
-
/*
* Provide a single set of attributes for all HT siblings of a core
* to avoid duplicate sensors (the processor ID and core ID of all
@@ -450,8 +514,14 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
* Skip if a HT sibling of this core is already registered.
* This is not an error.
*/
- if (pdata->core_data[attr_no] != NULL)
- return 0;
+ mutex_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list) {
+ if (tdata->id == attr_no) {
+ mutex_unlock(&pdata->temp_data_lock);
+ return 0;
+ }
+ }
+ mutex_unlock(&pdata->temp_data_lock);
tdata = init_temp_data(cpu, pkg_flag);
if (!tdata)
@@ -480,16 +550,23 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
}
}
- pdata->core_data[attr_no] = tdata;
+ tdata->id = attr_no;
+
+ mutex_lock(&pdata->temp_data_lock);
+ list_add(&tdata->list, &pdata->temp_data_list);
+ mutex_unlock(&pdata->temp_data_lock);
/* Create sysfs interfaces */
err = create_core_attrs(tdata, &pdev->dev, attr_no);
if (err)
- goto exit_free;
+ goto exit_list_del;
return 0;
+exit_list_del:
+ mutex_lock(&pdata->temp_data_lock);
+ list_del(&tdata->list);
+ mutex_unlock(&pdata->temp_data_lock);
exit_free:
- pdata->core_data[attr_no] = NULL;
kfree(tdata);
return err;
}
@@ -502,23 +579,21 @@ static void __cpuinit coretemp_add_core(unsigned int cpu, int pkg_flag)
if (!pdev)
return;
- err = create_core_data(pdev, cpu, pkg_flag);
+ err = create_temp_data(pdev, cpu, pkg_flag);
if (err)
dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
}
-static void coretemp_remove_core(struct platform_data *pdata,
- struct device *dev, int indx)
+static void coretemp_remove_core(struct temp_data *tdata, struct device *dev)
{
int i;
- struct temp_data *tdata = pdata->core_data[indx];
/* Remove the sysfs attributes */
for (i = 0; i < tdata->attr_size; i++)
device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
- kfree(pdata->core_data[indx]);
- pdata->core_data[indx] = NULL;
+ list_del(&tdata->list);
+ kref_put(&tdata->refcount, temp_data_release);
}
static int __devinit coretemp_probe(struct platform_device *pdev)
@@ -536,6 +611,8 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
goto exit_free;
pdata->phys_proc_id = pdev->id;
+ INIT_LIST_HEAD(&pdata->temp_data_list);
+ mutex_init(&pdata->temp_data_lock);
platform_set_drvdata(pdev, pdata);
pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
@@ -557,11 +634,12 @@ exit_free:
static int __devexit coretemp_remove(struct platform_device *pdev)
{
struct platform_data *pdata = platform_get_drvdata(pdev);
- int i;
+ struct temp_data *cur, *tmp;
- for (i = MAX_CORE_DATA - 1; i >= 0; --i)
- if (pdata->core_data[i])
- coretemp_remove_core(pdata, &pdev->dev, i);
+ mutex_lock(&pdata->temp_data_lock);
+ list_for_each_entry_safe(cur, tmp, &pdata->temp_data_list, list)
+ coretemp_remove_core(cur, &pdev->dev);
+ mutex_unlock(&pdata->temp_data_lock);
device_remove_file(&pdev->dev, &pdata->name_attr);
hwmon_device_unregister(pdata->hwmon_dev);
@@ -641,16 +719,17 @@ static void __cpuinit coretemp_device_remove(unsigned int cpu)
static bool __cpuinit is_any_core_online(struct platform_data *pdata)
{
- int i;
-
- /* Find online cores, except pkgtemp data */
- for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
- if (pdata->core_data[i] &&
- !pdata->core_data[i]->is_pkg_data) {
- return true;
- }
- }
- return false;
+ struct temp_data *tdata;
+ bool ret = true;
+
+ mutex_lock(&pdata->temp_data_lock);
+ list_for_each_entry(tdata, &pdata->temp_data_list, list)
+ if (!tdata->is_pkg_data)
+ goto out;
+ ret = false;
+out:
+ mutex_unlock(&pdata->temp_data_lock);
+ return ret;
}
static void __cpuinit get_core_online(unsigned int cpu)
@@ -697,9 +776,10 @@ static void __cpuinit get_core_online(unsigned int cpu)
static void __cpuinit put_core_offline(unsigned int cpu)
{
- int i, indx;
+ int i, attr_no;
struct platform_data *pdata;
struct platform_device *pdev = coretemp_get_pdev(cpu);
+ struct temp_data *tdata;
/* If the physical CPU device does not exist, just return */
if (!pdev)
@@ -707,14 +787,14 @@ static void __cpuinit put_core_offline(unsigned int cpu)
pdata = platform_get_drvdata(pdev);
- indx = TO_ATTR_NO(cpu);
+ attr_no = TO_ATTR_NO(cpu);
- /* The core id is too big, just return */
- if (indx > MAX_CORE_DATA - 1)
- return;
-
- if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
- coretemp_remove_core(pdata, &pdev->dev, indx);
+ tdata = get_temp_data(pdata, attr_no);
+ if (tdata) {
+ if (tdata->cpu == cpu)
+ coretemp_remove_core(tdata, &pdev->dev);
+ kref_put(&tdata->refcount, temp_data_release);
+ }
/*
* If a HT sibling of a core is taken offline, but another HT sibling
--
1.7.9.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [PATCH, v2] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-03 11:18 ` [PATCH, v2] " Kirill A. Shutemov
@ 2012-05-04 5:41 ` Guenter Roeck
2012-05-04 6:46 ` Kirill A. Shutemov
0 siblings, 1 reply; 15+ messages in thread
From: Guenter Roeck @ 2012-05-04 5:41 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Durgadoss R, Andi Kleen, Jean Delvare, lm-sensors,
linux-kernel
On Thu, May 03, 2012 at 07:18:56AM -0400, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> Let's rework code to allow arbitrary number of cores on a CPU, not
> limited by hardcoded array size.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> ---
> v2:
> - fix NULL pointer dereference. Thanks to R, Durgadoss;
> - use mutex instead of spinlock for list locking.
> ---
> drivers/hwmon/coretemp.c | 178 +++++++++++++++++++++++++++++++++-------------
> 1 files changed, 129 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 54a70fe..1c66131 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -36,6 +36,8 @@
> #include <linux/cpu.h>
> #include <linux/pci.h>
> #include <linux/smp.h>
> +#include <linux/list.h>
> +#include <linux/kref.h>
> #include <linux/moduleparam.h>
> #include <asm/msr.h>
> #include <asm/processor.h>
> @@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
> MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
>
> #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
> -#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
> #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
> #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
> #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
> -#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
>
> #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
> #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
> @@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> * @valid: If this is 1, the current temperature is valid.
> */
> struct temp_data {
> + struct list_head list;
> + struct kref refcount;
Hi,
the kref is not needed. The attribute access functions don't
need to be protected since the attributes for a core are deleted
before the core data itself is deleted. So it is not neccessary
to hold a lock while accessing/using temp_data in the attribute
access functions. All you need is to hold a mutex while you are
manipulating or walking the list.
Thanks,
Guenter
> + int id;
> int temp;
> int ttarget;
> int tjmax;
> @@ -101,7 +104,8 @@ struct temp_data {
> struct platform_data {
> struct device *hwmon_dev;
> u16 phys_proc_id;
> - struct temp_data *core_data[MAX_CORE_DATA];
> + struct list_head temp_data_list;
> + struct mutex temp_data_lock;
> struct device_attribute name_attr;
> };
>
> @@ -114,6 +118,29 @@ struct pdev_entry {
> static LIST_HEAD(pdev_list);
> static DEFINE_MUTEX(pdev_list_mutex);
>
> +static void temp_data_release(struct kref *ref)
> +{
> + struct temp_data *tdata = container_of(ref, struct temp_data, refcount);
> +
> + kfree(tdata);
> +}
> +
> +static struct temp_data *get_temp_data(struct platform_data *pdata, int id)
> +{
> + struct temp_data *tdata;
> +
> + mutex_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list)
> + if (tdata->id == id) {
> + kref_get(&tdata->refcount);
> + goto out;
> + }
> + tdata = NULL;
> +out:
> + mutex_unlock(&pdata->temp_data_lock);
> + return tdata;
> +}
> +
> static ssize_t show_name(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> @@ -125,12 +152,19 @@ static ssize_t show_label(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
>
> if (tdata->is_pkg_data)
> - return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
> + ret = sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
> + else
> + ret = sprintf(buf, "Core %u\n", tdata->cpu_core_id);
>
> - return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_crit_alarm(struct device *dev,
> @@ -139,11 +173,18 @@ static ssize_t show_crit_alarm(struct device *dev,
> u32 eax, edx;
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
>
> rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
>
> - return sprintf(buf, "%d\n", (eax >> 5) & 1);
> + ret = sprintf(buf, "%d\n", (eax >> 5) & 1);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_tjmax(struct device *dev,
> @@ -151,8 +192,16 @@ static ssize_t show_tjmax(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
> +
> + if (!tdata)
> + return -ENOENT;
> +
> + ret = sprintf(buf, "%d\n", tdata->tjmax);
>
> - return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_ttarget(struct device *dev,
> @@ -160,8 +209,16 @@ static ssize_t show_ttarget(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret;
>
> - return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
> + if (!tdata)
> + return -ENOENT;
> +
> + ret = sprintf(buf, "%d\n", tdata->ttarget);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static ssize_t show_temp(struct device *dev,
> @@ -170,7 +227,11 @@ static ssize_t show_temp(struct device *dev,
> u32 eax, edx;
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct platform_data *pdata = dev_get_drvdata(dev);
> - struct temp_data *tdata = pdata->core_data[attr->index];
> + struct temp_data *tdata = get_temp_data(pdata, attr->index);
> + ssize_t ret = -EAGAIN;
> +
> + if (!tdata)
> + return -ENOENT;
>
> mutex_lock(&tdata->update_lock);
>
> @@ -188,7 +249,12 @@ static ssize_t show_temp(struct device *dev,
> }
>
> mutex_unlock(&tdata->update_lock);
> - return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
> +
> + if (tdata->valid)
> + ret = sprintf(buf, "%d\n", tdata->temp);
> +
> + kref_put(&tdata->refcount, temp_data_release);
> + return ret;
> }
>
> static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id,
> @@ -412,6 +478,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
> tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
> if (!tdata)
> return NULL;
> + kref_init(&tdata->refcount);
>
> tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
> MSR_IA32_THERM_STATUS;
> @@ -423,7 +490,7 @@ static struct temp_data __cpuinit *init_temp_data(unsigned int cpu,
> return tdata;
> }
>
> -static int __cpuinit create_core_data(struct platform_device *pdev,
> +static int __cpuinit create_temp_data(struct platform_device *pdev,
> unsigned int cpu, int pkg_flag)
> {
> struct temp_data *tdata;
> @@ -440,9 +507,6 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
> */
> attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
>
> - if (attr_no > MAX_CORE_DATA - 1)
> - return -ERANGE;
> -
> /*
> * Provide a single set of attributes for all HT siblings of a core
> * to avoid duplicate sensors (the processor ID and core ID of all
> @@ -450,8 +514,14 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
> * Skip if a HT sibling of this core is already registered.
> * This is not an error.
> */
> - if (pdata->core_data[attr_no] != NULL)
> - return 0;
> + mutex_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list) {
> + if (tdata->id == attr_no) {
> + mutex_unlock(&pdata->temp_data_lock);
> + return 0;
> + }
> + }
> + mutex_unlock(&pdata->temp_data_lock);
>
> tdata = init_temp_data(cpu, pkg_flag);
> if (!tdata)
> @@ -480,16 +550,23 @@ static int __cpuinit create_core_data(struct platform_device *pdev,
> }
> }
>
> - pdata->core_data[attr_no] = tdata;
> + tdata->id = attr_no;
> +
> + mutex_lock(&pdata->temp_data_lock);
> + list_add(&tdata->list, &pdata->temp_data_list);
> + mutex_unlock(&pdata->temp_data_lock);
>
> /* Create sysfs interfaces */
> err = create_core_attrs(tdata, &pdev->dev, attr_no);
> if (err)
> - goto exit_free;
> + goto exit_list_del;
>
> return 0;
> +exit_list_del:
> + mutex_lock(&pdata->temp_data_lock);
> + list_del(&tdata->list);
> + mutex_unlock(&pdata->temp_data_lock);
> exit_free:
> - pdata->core_data[attr_no] = NULL;
> kfree(tdata);
> return err;
> }
> @@ -502,23 +579,21 @@ static void __cpuinit coretemp_add_core(unsigned int cpu, int pkg_flag)
> if (!pdev)
> return;
>
> - err = create_core_data(pdev, cpu, pkg_flag);
> + err = create_temp_data(pdev, cpu, pkg_flag);
> if (err)
> dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
> }
>
> -static void coretemp_remove_core(struct platform_data *pdata,
> - struct device *dev, int indx)
> +static void coretemp_remove_core(struct temp_data *tdata, struct device *dev)
> {
> int i;
> - struct temp_data *tdata = pdata->core_data[indx];
>
> /* Remove the sysfs attributes */
> for (i = 0; i < tdata->attr_size; i++)
> device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
>
> - kfree(pdata->core_data[indx]);
> - pdata->core_data[indx] = NULL;
> + list_del(&tdata->list);
> + kref_put(&tdata->refcount, temp_data_release);
> }
>
> static int __devinit coretemp_probe(struct platform_device *pdev)
> @@ -536,6 +611,8 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
> goto exit_free;
>
> pdata->phys_proc_id = pdev->id;
> + INIT_LIST_HEAD(&pdata->temp_data_list);
> + mutex_init(&pdata->temp_data_lock);
> platform_set_drvdata(pdev, pdata);
>
> pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
> @@ -557,11 +634,12 @@ exit_free:
> static int __devexit coretemp_remove(struct platform_device *pdev)
> {
> struct platform_data *pdata = platform_get_drvdata(pdev);
> - int i;
> + struct temp_data *cur, *tmp;
>
> - for (i = MAX_CORE_DATA - 1; i >= 0; --i)
> - if (pdata->core_data[i])
> - coretemp_remove_core(pdata, &pdev->dev, i);
> + mutex_lock(&pdata->temp_data_lock);
> + list_for_each_entry_safe(cur, tmp, &pdata->temp_data_list, list)
> + coretemp_remove_core(cur, &pdev->dev);
> + mutex_unlock(&pdata->temp_data_lock);
>
> device_remove_file(&pdev->dev, &pdata->name_attr);
> hwmon_device_unregister(pdata->hwmon_dev);
> @@ -641,16 +719,17 @@ static void __cpuinit coretemp_device_remove(unsigned int cpu)
>
> static bool __cpuinit is_any_core_online(struct platform_data *pdata)
> {
> - int i;
> -
> - /* Find online cores, except pkgtemp data */
> - for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
> - if (pdata->core_data[i] &&
> - !pdata->core_data[i]->is_pkg_data) {
> - return true;
> - }
> - }
> - return false;
> + struct temp_data *tdata;
> + bool ret = true;
> +
> + mutex_lock(&pdata->temp_data_lock);
> + list_for_each_entry(tdata, &pdata->temp_data_list, list)
> + if (!tdata->is_pkg_data)
> + goto out;
> + ret = false;
> +out:
> + mutex_unlock(&pdata->temp_data_lock);
> + return ret;
> }
>
> static void __cpuinit get_core_online(unsigned int cpu)
> @@ -697,9 +776,10 @@ static void __cpuinit get_core_online(unsigned int cpu)
>
> static void __cpuinit put_core_offline(unsigned int cpu)
> {
> - int i, indx;
> + int i, attr_no;
> struct platform_data *pdata;
> struct platform_device *pdev = coretemp_get_pdev(cpu);
> + struct temp_data *tdata;
>
> /* If the physical CPU device does not exist, just return */
> if (!pdev)
> @@ -707,14 +787,14 @@ static void __cpuinit put_core_offline(unsigned int cpu)
>
> pdata = platform_get_drvdata(pdev);
>
> - indx = TO_ATTR_NO(cpu);
> + attr_no = TO_ATTR_NO(cpu);
>
> - /* The core id is too big, just return */
> - if (indx > MAX_CORE_DATA - 1)
> - return;
> -
> - if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
> - coretemp_remove_core(pdata, &pdev->dev, indx);
> + tdata = get_temp_data(pdata, attr_no);
> + if (tdata) {
> + if (tdata->cpu == cpu)
> + coretemp_remove_core(tdata, &pdev->dev);
> + kref_put(&tdata->refcount, temp_data_release);
> + }
>
> /*
> * If a HT sibling of a core is taken offline, but another HT sibling
> --
> 1.7.9.1
>
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH, v2] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-04 5:41 ` Guenter Roeck
@ 2012-05-04 6:46 ` Kirill A. Shutemov
2012-05-04 13:34 ` Guenter Roeck
0 siblings, 1 reply; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-04 6:46 UTC (permalink / raw)
To: Guenter Roeck
Cc: Fenghua Yu, Durgadoss R, Andi Kleen, Jean Delvare, lm-sensors,
linux-kernel
[-- Attachment #1: Type: text/plain, Size: 2773 bytes --]
On Thu, May 03, 2012 at 10:41:22PM -0700, Guenter Roeck wrote:
> On Thu, May 03, 2012 at 07:18:56AM -0400, Kirill A. Shutemov wrote:
> > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> >
> > Let's rework code to allow arbitrary number of cores on a CPU, not
> > limited by hardcoded array size.
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > ---
> > v2:
> > - fix NULL pointer dereference. Thanks to R, Durgadoss;
> > - use mutex instead of spinlock for list locking.
> > ---
> > drivers/hwmon/coretemp.c | 178 +++++++++++++++++++++++++++++++++-------------
> > 1 files changed, 129 insertions(+), 49 deletions(-)
> >
> > diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> > index 54a70fe..1c66131 100644
> > --- a/drivers/hwmon/coretemp.c
> > +++ b/drivers/hwmon/coretemp.c
> > @@ -36,6 +36,8 @@
> > #include <linux/cpu.h>
> > #include <linux/pci.h>
> > #include <linux/smp.h>
> > +#include <linux/list.h>
> > +#include <linux/kref.h>
> > #include <linux/moduleparam.h>
> > #include <asm/msr.h>
> > #include <asm/processor.h>
> > @@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
> > MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> >
> > #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
> > -#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
> > #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
> > #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
> > #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
> > -#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
> >
> > #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
> > #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
> > @@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> > * @valid: If this is 1, the current temperature is valid.
> > */
> > struct temp_data {
> > + struct list_head list;
> > + struct kref refcount;
>
> Hi,
>
> the kref is not needed. The attribute access functions don't
> need to be protected since the attributes for a core are deleted
> before the core data itself is deleted. So it is not neccessary
> to hold a lock while accessing/using temp_data in the attribute
> access functions. All you need is to hold a mutex while you are
> manipulating or walking the list.
Without kref, what prevents following situation:
CPU-A CPU-B
tdata = get_temp_data();
coretemp_remove_core() {
device_remove_file();
kfree(tdata);
}
<tdata dereference>
?
--
Kirill A. Shutemov
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH, v2] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-04 6:46 ` Kirill A. Shutemov
@ 2012-05-04 13:34 ` Guenter Roeck
2012-05-04 13:42 ` Kirill A. Shutemov
0 siblings, 1 reply; 15+ messages in thread
From: Guenter Roeck @ 2012-05-04 13:34 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Fenghua Yu, Durgadoss R, Andi Kleen, Jean Delvare, lm-sensors,
linux-kernel
On Fri, May 04, 2012 at 02:46:06AM -0400, Kirill A. Shutemov wrote:
> On Thu, May 03, 2012 at 10:41:22PM -0700, Guenter Roeck wrote:
> > On Thu, May 03, 2012 at 07:18:56AM -0400, Kirill A. Shutemov wrote:
> > > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> > >
> > > Let's rework code to allow arbitrary number of cores on a CPU, not
> > > limited by hardcoded array size.
> > >
> > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > > ---
> > > v2:
> > > - fix NULL pointer dereference. Thanks to R, Durgadoss;
> > > - use mutex instead of spinlock for list locking.
> > > ---
> > > drivers/hwmon/coretemp.c | 178 +++++++++++++++++++++++++++++++++-------------
> > > 1 files changed, 129 insertions(+), 49 deletions(-)
> > >
> > > diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> > > index 54a70fe..1c66131 100644
> > > --- a/drivers/hwmon/coretemp.c
> > > +++ b/drivers/hwmon/coretemp.c
> > > @@ -36,6 +36,8 @@
> > > #include <linux/cpu.h>
> > > #include <linux/pci.h>
> > > #include <linux/smp.h>
> > > +#include <linux/list.h>
> > > +#include <linux/kref.h>
> > > #include <linux/moduleparam.h>
> > > #include <asm/msr.h>
> > > #include <asm/processor.h>
> > > @@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
> > > MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> > >
> > > #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
> > > -#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
> > > #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
> > > #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
> > > #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
> > > -#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
> > >
> > > #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
> > > #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
> > > @@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> > > * @valid: If this is 1, the current temperature is valid.
> > > */
> > > struct temp_data {
> > > + struct list_head list;
> > > + struct kref refcount;
> >
> > Hi,
> >
> > the kref is not needed. The attribute access functions don't
> > need to be protected since the attributes for a core are deleted
> > before the core data itself is deleted. So it is not neccessary
> > to hold a lock while accessing/using temp_data in the attribute
> > access functions. All you need is to hold a mutex while you are
> > manipulating or walking the list.
>
> Without kref, what prevents following situation:
>
> CPU-A CPU-B
> tdata = get_temp_data();
> coretemp_remove_core() {
> device_remove_file();
> kfree(tdata);
> }
> <tdata dereference>
>
The remove function requires a semaphore which is held by the access function,
so device_remove_file() will only proceed after CPU-A is done with the sysfs access.
Guenter
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH, v2] hwmon: coretemp: use list instead of fixed size array for temp data
2012-05-04 13:34 ` Guenter Roeck
@ 2012-05-04 13:42 ` Kirill A. Shutemov
0 siblings, 0 replies; 15+ messages in thread
From: Kirill A. Shutemov @ 2012-05-04 13:42 UTC (permalink / raw)
To: Guenter Roeck
Cc: Fenghua Yu, Durgadoss R, Andi Kleen, Jean Delvare, lm-sensors,
linux-kernel
[-- Attachment #1: Type: text/plain, Size: 3381 bytes --]
On Fri, May 04, 2012 at 06:34:19AM -0700, Guenter Roeck wrote:
> On Fri, May 04, 2012 at 02:46:06AM -0400, Kirill A. Shutemov wrote:
> > On Thu, May 03, 2012 at 10:41:22PM -0700, Guenter Roeck wrote:
> > > On Thu, May 03, 2012 at 07:18:56AM -0400, Kirill A. Shutemov wrote:
> > > > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> > > >
> > > > Let's rework code to allow arbitrary number of cores on a CPU, not
> > > > limited by hardcoded array size.
> > > >
> > > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > > > ---
> > > > v2:
> > > > - fix NULL pointer dereference. Thanks to R, Durgadoss;
> > > > - use mutex instead of spinlock for list locking.
> > > > ---
> > > > drivers/hwmon/coretemp.c | 178 +++++++++++++++++++++++++++++++++-------------
> > > > 1 files changed, 129 insertions(+), 49 deletions(-)
> > > >
> > > > diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> > > > index 54a70fe..1c66131 100644
> > > > --- a/drivers/hwmon/coretemp.c
> > > > +++ b/drivers/hwmon/coretemp.c
> > > > @@ -36,6 +36,8 @@
> > > > #include <linux/cpu.h>
> > > > #include <linux/pci.h>
> > > > #include <linux/smp.h>
> > > > +#include <linux/list.h>
> > > > +#include <linux/kref.h>
> > > > #include <linux/moduleparam.h>
> > > > #include <asm/msr.h>
> > > > #include <asm/processor.h>
> > > > @@ -52,11 +54,9 @@ module_param_named(tjmax, force_tjmax, int, 0444);
> > > > MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> > > >
> > > > #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
> > > > -#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
> > > > #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
> > > > #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
> > > > #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
> > > > -#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
> > > >
> > > > #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
> > > > #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
> > > > @@ -82,6 +82,9 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
> > > > * @valid: If this is 1, the current temperature is valid.
> > > > */
> > > > struct temp_data {
> > > > + struct list_head list;
> > > > + struct kref refcount;
> > >
> > > Hi,
> > >
> > > the kref is not needed. The attribute access functions don't
> > > need to be protected since the attributes for a core are deleted
> > > before the core data itself is deleted. So it is not neccessary
> > > to hold a lock while accessing/using temp_data in the attribute
> > > access functions. All you need is to hold a mutex while you are
> > > manipulating or walking the list.
> >
> > Without kref, what prevents following situation:
> >
> > CPU-A CPU-B
> > tdata = get_temp_data();
> > coretemp_remove_core() {
> > device_remove_file();
> > kfree(tdata);
> > }
> > <tdata dereference>
> >
> The remove function requires a semaphore which is held by the access function,
> so device_remove_file() will only proceed after CPU-A is done with the sysfs access.
Understood. I'll update the patch.
--
Kirill A. Shutemov
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
^ permalink raw reply [flat|nested] 15+ messages in thread
end of thread, other threads:[~2012-05-04 13:41 UTC | newest]
Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-04-30 13:18 [PATCH] hwmon: coretemp: fix oops on cpu unplug Kirill A. Shutemov
2012-04-30 15:28 ` Guenter Roeck
2012-04-30 16:19 ` Kirill A. Shutemov
2012-04-30 16:59 ` Guenter Roeck
2012-05-01 15:20 ` Guenter Roeck
2012-05-01 21:00 ` Kirill A. Shutemov
2012-05-01 21:25 ` Guenter Roeck
2012-05-02 15:10 ` [PATCH] hwmon: coretemp: use list instead of fixed size array for temp data Kirill A. Shutemov
2012-05-03 5:29 ` [lm-sensors] " R, Durgadoss
2012-05-03 10:04 ` Kirill A. Shutemov
2012-05-03 11:18 ` [PATCH, v2] " Kirill A. Shutemov
2012-05-04 5:41 ` Guenter Roeck
2012-05-04 6:46 ` Kirill A. Shutemov
2012-05-04 13:34 ` Guenter Roeck
2012-05-04 13:42 ` Kirill A. Shutemov
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