* - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
@ 2007-02-08 21:32 akpm
2007-02-11 0:11 ` Dave Jones
0 siblings, 1 reply; 8+ messages in thread
From: akpm @ 2007-02-08 21:32 UTC (permalink / raw)
To: adobriyan, ak, davej, mm-commits
The patch titled
rdmsr_on_cpu, wrmsr_on_cpu
has been removed from the -mm tree. Its filename was
rdmsr_on_cpu-wrmsr_on_cpu.patch
This patch was dropped because I've lost the plot on this thing
------------------------------------------------------
Subject: rdmsr_on_cpu, wrmsr_on_cpu
From: Alexey Dobriyan <adobriyan@openvz.org>
There was OpenVZ specific bug rendering some cpufreq drivers unusable on SMP.
In short, when cpufreq code thinks it confined itself to needed cpu by means
of set_cpus_allowed() to execute rdmsr, some "virtual cpu" feature can migrate
process to anywhere. This triggers bugons and does wrong things in general.
This got fixed by introducing rdmsr_on_cpu and wrmsr_on_cpu executing rdmsr
and wrmsr on given physical cpu by means of smp_call_function_single().
Dave Jones mentioned cpufreq might be not only user of rdmsr_on_cpu() and
wrmsr_on_cpu(), so I'm putting them into arch/{i386,x86_64}/lib/ .
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/i386/lib/Makefile | 2
arch/i386/lib/msr-on-cpu.c | 70 +++++++++++++++++++++++++++++++++
arch/x86_64/lib/Makefile | 2
arch/x86_64/lib/msr-on-cpu.c | 1
include/asm-i386/msr.h | 3 +
include/asm-x86_64/msr.h | 2
6 files changed, 79 insertions(+), 1 deletion(-)
diff -puN arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/i386/lib/Makefile
--- a/arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/i386/lib/Makefile
@@ -7,3 +7,5 @@ lib-y = checksum.o delay.o usercopy.o ge
bitops.o semaphore.o
lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
+
+obj-y = msr-on-cpu.o
diff -puN /dev/null arch/i386/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/i386/lib/msr-on-cpu.c
@@ -0,0 +1,70 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+#ifdef CONFIG_SMP
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ rdmsr(msr_no, *l, *h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+ *l = rv.l;
+ *h = rv.h;
+ }
+ preempt_enable();
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ wrmsr(msr_no, l, h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+ }
+ preempt_enable();
+}
+#else
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ rdmsr(msr_no, *l, *h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ wrmsr(msr_no, l, h);
+}
+#endif
+
+EXPORT_SYMBOL(rdmsr_on_cpu);
+EXPORT_SYMBOL(wrmsr_on_cpu);
diff -puN arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/x86_64/lib/Makefile
@@ -4,7 +4,7 @@
CFLAGS_csum-partial.o := -funroll-loops
-obj-y := io.o iomap_copy.o
+obj-y := io.o iomap_copy.o msr-on-cpu.o
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
diff -puN /dev/null arch/x86_64/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/x86_64/lib/msr-on-cpu.c
@@ -0,0 +1 @@
+#include "../../i386/lib/msr-on-cpu.c"
diff -puN include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-i386/msr.h
--- a/include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-i386/msr.h
@@ -83,6 +83,9 @@ static inline void wrmsrl (unsigned long
: "c" (counter))
#endif /* !CONFIG_PARAVIRT */
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+
/* symbolic names for some interesting MSRs */
/* Intel defined MSRs. */
#define MSR_IA32_P5_MC_ADDR 0
diff -puN include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-x86_64/msr.h
--- a/include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-x86_64/msr.h
@@ -160,6 +160,8 @@ static inline unsigned int cpuid_edx(uns
#define MSR_IA32_UCODE_WRITE 0x79
#define MSR_IA32_UCODE_REV 0x8b
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#endif
_
Patches currently in -mm which might be from adobriyan@openvz.org are
git-net.patch
revert-x86_64-mm-msr-on-cpu.patch
rdmsr_on_cpu-wrmsr_on_cpu.patch
p4-clockmod-use-rdmsr_on_cpu-wrmsr_on_cpu.patch
sysctl_ms_jiffies-fix-oldlen-semantics.patch
consolidate-default-sched_clock.patch
fix-rmmod-read-write-races-in-proc-entries.patch
sn2-use-static-proc_fops.patch
consolidate-bust_spinlocks.patch
extract-and-use-wake_up_klogd.patch
allow-access-to-proc-pid-fd-after-setuid.patch
allow-access-to-proc-pid-fd-after-setuid-fix.patch
allow-access-to-proc-pid-fd-after-setuid-update.patch
lutimesat-simplify-utime2.patch
lutimesat-extend-do_utimes-with-flags.patch
lutimesat-actual-syscall-and-wire-up-on-i386.patch
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
2007-02-08 21:32 - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree akpm
@ 2007-02-11 0:11 ` Dave Jones
2007-02-11 10:38 ` Andi Kleen
0 siblings, 1 reply; 8+ messages in thread
From: Dave Jones @ 2007-02-11 0:11 UTC (permalink / raw)
To: linux-kernel; +Cc: adobriyan, ak
On Thu, Feb 08, 2007 at 01:32:43PM -0800, akpm@linux-foundation.org wrote:
>
> The patch titled
> rdmsr_on_cpu, wrmsr_on_cpu
> has been removed from the -mm tree. Its filename was
> rdmsr_on_cpu-wrmsr_on_cpu.patch
>
> This patch was dropped because I've lost the plot on this thing
Alexey, send me the latest fixed up version of this, and I'll
queue this up to save Andrew trying to sort it out.
Dave
--
http://www.codemonkey.org.uk
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
2007-02-11 0:11 ` Dave Jones
@ 2007-02-11 10:38 ` Andi Kleen
2007-02-12 22:00 ` Andrew Morton
0 siblings, 1 reply; 8+ messages in thread
From: Andi Kleen @ 2007-02-11 10:38 UTC (permalink / raw)
To: Dave Jones; +Cc: linux-kernel, adobriyan
On Sunday 11 February 2007 01:11, Dave Jones wrote:
> On Thu, Feb 08, 2007 at 01:32:43PM -0800, akpm@linux-foundation.org wrote:
> >
> > The patch titled
> > rdmsr_on_cpu, wrmsr_on_cpu
> > has been removed from the -mm tree. Its filename was
> > rdmsr_on_cpu-wrmsr_on_cpu.patch
> >
> > This patch was dropped because I've lost the plot on this thing
>
> Alexey, send me the latest fixed up version of this, and I'll
> queue this up to save Andrew trying to sort it out.
I fixed it up to at least support x86-64 too
-Andi
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
2007-02-11 10:38 ` Andi Kleen
@ 2007-02-12 22:00 ` Andrew Morton
2007-02-12 22:24 ` Andi Kleen
0 siblings, 1 reply; 8+ messages in thread
From: Andrew Morton @ 2007-02-12 22:00 UTC (permalink / raw)
To: Andi Kleen; +Cc: davej, linux-kernel, adobriyan
> On Sun, 11 Feb 2007 11:38:23 +0100 Andi Kleen <ak@suse.de> wrote:
> On Sunday 11 February 2007 01:11, Dave Jones wrote:
> > On Thu, Feb 08, 2007 at 01:32:43PM -0800, akpm@linux-foundation.org wrote:
> > >
> > > The patch titled
> > > rdmsr_on_cpu, wrmsr_on_cpu
> > > has been removed from the -mm tree. Its filename was
> > > rdmsr_on_cpu-wrmsr_on_cpu.patch
> > >
> > > This patch was dropped because I've lost the plot on this thing
> >
> > Alexey, send me the latest fixed up version of this, and I'll
> > queue this up to save Andrew trying to sort it out.
>
> I fixed it up to at least support x86-64 too
>
No you didn't ;) I still get a build error with i386 allmodconfig using
your version.
I backed out x86_64-mm-msr-on-cpu.patch (again) and went with Alexey's
second version (again). It works fine.
From: Alexey Dobriyan <adobriyan@openvz.org>
There was OpenVZ specific bug rendering some cpufreq drivers unusable on SMP.
In short, when cpufreq code thinks it confined itself to needed cpu by means
of set_cpus_allowed() to execute rdmsr, some "virtual cpu" feature can migrate
process to anywhere. This triggers bugons and does wrong things in general.
This got fixed by introducing rdmsr_on_cpu and wrmsr_on_cpu executing rdmsr
and wrmsr on given physical cpu by means of smp_call_function_single().
Dave Jones mentioned cpufreq might be not only user of rdmsr_on_cpu() and
wrmsr_on_cpu(), so I'm putting them into arch/{i386,x86_64}/lib/ .
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/i386/lib/Makefile | 2
arch/i386/lib/msr-on-cpu.c | 70 +++++++++++++++++++++++++++++++++
arch/x86_64/lib/Makefile | 2
arch/x86_64/lib/msr-on-cpu.c | 1
include/asm-i386/msr.h | 3 +
include/asm-x86_64/msr.h | 2
6 files changed, 79 insertions(+), 1 deletion(-)
diff -puN arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/i386/lib/Makefile
--- a/arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/i386/lib/Makefile
@@ -7,3 +7,5 @@ lib-y = checksum.o delay.o usercopy.o ge
bitops.o semaphore.o
lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
+
+obj-y = msr-on-cpu.o
diff -puN /dev/null arch/i386/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/i386/lib/msr-on-cpu.c
@@ -0,0 +1,70 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+#ifdef CONFIG_SMP
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ rdmsr(msr_no, *l, *h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+ *l = rv.l;
+ *h = rv.h;
+ }
+ preempt_enable();
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ wrmsr(msr_no, l, h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+ }
+ preempt_enable();
+}
+#else
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ rdmsr(msr_no, *l, *h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ wrmsr(msr_no, l, h);
+}
+#endif
+
+EXPORT_SYMBOL(rdmsr_on_cpu);
+EXPORT_SYMBOL(wrmsr_on_cpu);
diff -puN arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/x86_64/lib/Makefile
@@ -4,7 +4,7 @@
CFLAGS_csum-partial.o := -funroll-loops
-obj-y := io.o iomap_copy.o
+obj-y := io.o iomap_copy.o msr-on-cpu.o
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
diff -puN /dev/null arch/x86_64/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/x86_64/lib/msr-on-cpu.c
@@ -0,0 +1 @@
+#include "../../i386/lib/msr-on-cpu.c"
diff -puN include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-i386/msr.h
--- a/include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-i386/msr.h
@@ -83,6 +83,9 @@ static inline void wrmsrl (unsigned long
: "c" (counter))
#endif /* !CONFIG_PARAVIRT */
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+
/* symbolic names for some interesting MSRs */
/* Intel defined MSRs. */
#define MSR_IA32_P5_MC_ADDR 0
diff -puN include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-x86_64/msr.h
--- a/include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-x86_64/msr.h
@@ -160,6 +160,8 @@ static inline unsigned int cpuid_edx(uns
#define MSR_IA32_UCODE_WRITE 0x79
#define MSR_IA32_UCODE_REV 0x8b
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#endif
_
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
2007-02-12 22:00 ` Andrew Morton
@ 2007-02-12 22:24 ` Andi Kleen
2007-02-12 22:56 ` Andrew Morton
0 siblings, 1 reply; 8+ messages in thread
From: Andi Kleen @ 2007-02-12 22:24 UTC (permalink / raw)
To: Andrew Morton; +Cc: davej, linux-kernel, adobriyan
On Monday 12 February 2007 23:00, Andrew Morton wrote:
> > On Sun, 11 Feb 2007 11:38:23 +0100 Andi Kleen <ak@suse.de> wrote:
> > On Sunday 11 February 2007 01:11, Dave Jones wrote:
> > > On Thu, Feb 08, 2007 at 01:32:43PM -0800, akpm@linux-foundation.org wrote:
> > > >
> > > > The patch titled
> > > > rdmsr_on_cpu, wrmsr_on_cpu
> > > > has been removed from the -mm tree. Its filename was
> > > > rdmsr_on_cpu-wrmsr_on_cpu.patch
> > > >
> > > > This patch was dropped because I've lost the plot on this thing
> > >
> > > Alexey, send me the latest fixed up version of this, and I'll
> > > queue this up to save Andrew trying to sort it out.
> >
> > I fixed it up to at least support x86-64 too
> >
>
> No you didn't ;) I still get a build error with i386 allmodconfig using
> your version.
That's not surprising because I didn't change anything on i386
>
> I backed out x86_64-mm-msr-on-cpu.patch (again) and went with Alexey's
> second version (again). It works fine.
I think I'll just drop the thing. Nuisance:gain seems to be out of order
-Andi
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
2007-02-12 22:24 ` Andi Kleen
@ 2007-02-12 22:56 ` Andrew Morton
0 siblings, 0 replies; 8+ messages in thread
From: Andrew Morton @ 2007-02-12 22:56 UTC (permalink / raw)
To: Andi Kleen; +Cc: davej, linux-kernel, adobriyan
> On Mon, 12 Feb 2007 23:24:44 +0100 Andi Kleen <andi@firstfloor.org> wrote:
> >
> > I backed out x86_64-mm-msr-on-cpu.patch (again) and went with Alexey's
> > second version (again). It works fine.
>
> I think I'll just drop the thing. Nuisance:gain seems to be out of order
It hasn't caused me any problems. The nuisance factor at your end
is all due to trying to get the old patch to work rather than using the new one.
^ permalink raw reply [flat|nested] 8+ messages in thread
* - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
@ 2007-04-28 11:53 akpm
0 siblings, 0 replies; 8+ messages in thread
From: akpm @ 2007-04-28 11:53 UTC (permalink / raw)
To: adobriyan, ak, davej, mm-commits
The patch titled
rdmsr_on_cpu, wrmsr_on_cpu
has been removed from the -mm tree. Its filename was
rdmsr_on_cpu-wrmsr_on_cpu.patch
This patch was dropped because it is obsolete
------------------------------------------------------
Subject: rdmsr_on_cpu, wrmsr_on_cpu
From: Alexey Dobriyan <adobriyan@openvz.org>
There was OpenVZ specific bug rendering some cpufreq drivers unusable on SMP.
In short, when cpufreq code thinks it confined itself to needed cpu by means
of set_cpus_allowed() to execute rdmsr, some "virtual cpu" feature can migrate
process to anywhere. This triggers bugons and does wrong things in general.
This got fixed by introducing rdmsr_on_cpu and wrmsr_on_cpu executing rdmsr
and wrmsr on given physical cpu by means of smp_call_function_single().
Dave Jones mentioned cpufreq might be not only user of rdmsr_on_cpu() and
wrmsr_on_cpu(), so I'm putting them into arch/{i386,x86_64}/lib/ .
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/i386/lib/Makefile | 2
arch/i386/lib/msr-on-cpu.c | 70 +++++++++++++++++++++++++++++++++
arch/x86_64/lib/Makefile | 2
arch/x86_64/lib/msr-on-cpu.c | 1
include/asm-i386/msr.h | 3 +
include/asm-x86_64/msr.h | 2
6 files changed, 79 insertions(+), 1 deletion(-)
diff -puN arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/i386/lib/Makefile
--- a/arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/i386/lib/Makefile
@@ -7,3 +7,5 @@ lib-y = checksum.o delay.o usercopy.o ge
bitops.o semaphore.o
lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
+
+obj-y = msr-on-cpu.o
diff -puN /dev/null arch/i386/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/i386/lib/msr-on-cpu.c
@@ -0,0 +1,70 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+#ifdef CONFIG_SMP
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ rdmsr(msr_no, *l, *h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+ *l = rv.l;
+ *h = rv.h;
+ }
+ preempt_enable();
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ wrmsr(msr_no, l, h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+ }
+ preempt_enable();
+}
+#else
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ rdmsr(msr_no, *l, *h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ wrmsr(msr_no, l, h);
+}
+#endif
+
+EXPORT_SYMBOL(rdmsr_on_cpu);
+EXPORT_SYMBOL(wrmsr_on_cpu);
diff -puN arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/x86_64/lib/Makefile
@@ -4,7 +4,7 @@
CFLAGS_csum-partial.o := -funroll-loops
-obj-y := io.o iomap_copy.o
+obj-y := io.o iomap_copy.o msr-on-cpu.o
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
diff -puN /dev/null arch/x86_64/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/x86_64/lib/msr-on-cpu.c
@@ -0,0 +1 @@
+#include "../../i386/lib/msr-on-cpu.c"
diff -puN include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-i386/msr.h
--- a/include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-i386/msr.h
@@ -83,6 +83,9 @@ static inline void wrmsrl (unsigned long
: "c" (counter))
#endif /* !CONFIG_PARAVIRT */
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+
/* symbolic names for some interesting MSRs */
/* Intel defined MSRs. */
#define MSR_IA32_P5_MC_ADDR 0
diff -puN include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-x86_64/msr.h
--- a/include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-x86_64/msr.h
@@ -160,6 +160,8 @@ static inline unsigned int cpuid_edx(uns
#define MSR_IA32_UCODE_WRITE 0x79
#define MSR_IA32_UCODE_REV 0x8b
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#endif
_
Patches currently in -mm which might be from adobriyan@openvz.org are
git-parisc.patch
rdmsr_on_cpu-wrmsr_on_cpu.patch
allow-access-to-proc-pid-fd-after-setuid.patch
fix-race-between-proc_get_inode-and-remove_proc_entry.patch
utimensat-implementation.patch
utimensat-implementation-fix.patch
^ permalink raw reply [flat|nested] 8+ messages in thread
* - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree
@ 2007-02-18 2:15 akpm
0 siblings, 0 replies; 8+ messages in thread
From: akpm @ 2007-02-18 2:15 UTC (permalink / raw)
To: adobriyan, ak, davej, mm-commits
The patch titled
rdmsr_on_cpu, wrmsr_on_cpu
has been removed from the -mm tree. Its filename was
rdmsr_on_cpu-wrmsr_on_cpu.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: rdmsr_on_cpu, wrmsr_on_cpu
From: Alexey Dobriyan <adobriyan@openvz.org>
There was OpenVZ specific bug rendering some cpufreq drivers unusable on SMP.
In short, when cpufreq code thinks it confined itself to needed cpu by means
of set_cpus_allowed() to execute rdmsr, some "virtual cpu" feature can migrate
process to anywhere. This triggers bugons and does wrong things in general.
This got fixed by introducing rdmsr_on_cpu and wrmsr_on_cpu executing rdmsr
and wrmsr on given physical cpu by means of smp_call_function_single().
Dave Jones mentioned cpufreq might be not only user of rdmsr_on_cpu() and
wrmsr_on_cpu(), so I'm putting them into arch/{i386,x86_64}/lib/ .
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/i386/lib/Makefile | 2
arch/i386/lib/msr-on-cpu.c | 70 +++++++++++++++++++++++++++++++++
arch/x86_64/lib/Makefile | 2
arch/x86_64/lib/msr-on-cpu.c | 1
include/asm-i386/msr.h | 3 +
include/asm-x86_64/msr.h | 2
6 files changed, 79 insertions(+), 1 deletion(-)
diff -puN arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/i386/lib/Makefile
--- a/arch/i386/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/i386/lib/Makefile
@@ -7,3 +7,5 @@ lib-y = checksum.o delay.o usercopy.o ge
bitops.o semaphore.o
lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
+
+obj-y = msr-on-cpu.o
diff -puN /dev/null arch/i386/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/i386/lib/msr-on-cpu.c
@@ -0,0 +1,70 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+#ifdef CONFIG_SMP
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ rdmsr(msr_no, *l, *h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+ *l = rv.l;
+ *h = rv.h;
+ }
+ preempt_enable();
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ preempt_disable();
+ if (smp_processor_id() == cpu)
+ wrmsr(msr_no, l, h);
+ else {
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+ }
+ preempt_enable();
+}
+#else
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ rdmsr(msr_no, *l, *h);
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ wrmsr(msr_no, l, h);
+}
+#endif
+
+EXPORT_SYMBOL(rdmsr_on_cpu);
+EXPORT_SYMBOL(wrmsr_on_cpu);
diff -puN arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/arch/x86_64/lib/Makefile
@@ -4,7 +4,7 @@
CFLAGS_csum-partial.o := -funroll-loops
-obj-y := io.o iomap_copy.o
+obj-y := io.o iomap_copy.o msr-on-cpu.o
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
diff -puN /dev/null arch/x86_64/lib/msr-on-cpu.c
--- /dev/null
+++ a/arch/x86_64/lib/msr-on-cpu.c
@@ -0,0 +1 @@
+#include "../../i386/lib/msr-on-cpu.c"
diff -puN include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-i386/msr.h
--- a/include/asm-i386/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-i386/msr.h
@@ -83,6 +83,9 @@ static inline void wrmsrl (unsigned long
: "c" (counter))
#endif /* !CONFIG_PARAVIRT */
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+
/* symbolic names for some interesting MSRs */
/* Intel defined MSRs. */
#define MSR_IA32_P5_MC_ADDR 0
diff -puN include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu include/asm-x86_64/msr.h
--- a/include/asm-x86_64/msr.h~rdmsr_on_cpu-wrmsr_on_cpu
+++ a/include/asm-x86_64/msr.h
@@ -160,6 +160,8 @@ static inline unsigned int cpuid_edx(uns
#define MSR_IA32_UCODE_WRITE 0x79
#define MSR_IA32_UCODE_REV 0x8b
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#endif
_
Patches currently in -mm which might be from adobriyan@openvz.org are
origin.patch
fix-rmmod-read-write-races-in-proc-entries.patch
allow-access-to-proc-pid-fd-after-setuid.patch
allow-access-to-proc-pid-fd-after-setuid-fix.patch
allow-access-to-proc-pid-fd-after-setuid-update.patch
allow-access-to-proc-pid-fd-after-setuid-update-2.patch
lutimesat-simplify-utime2.patch
lutimesat-extend-do_utimes-with-flags.patch
lutimesat-actual-syscall-and-wire-up-on-i386.patch
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2007-04-28 11:56 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-02-08 21:32 - rdmsr_on_cpu-wrmsr_on_cpu.patch removed from -mm tree akpm
2007-02-11 0:11 ` Dave Jones
2007-02-11 10:38 ` Andi Kleen
2007-02-12 22:00 ` Andrew Morton
2007-02-12 22:24 ` Andi Kleen
2007-02-12 22:56 ` Andrew Morton
2007-02-18 2:15 akpm
2007-04-28 11:53 akpm
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