From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [GIT PULL] timer fixes
Date: Tue, 19 Apr 2011 18:03:16 +0200 [thread overview]
Message-ID: <20110419160316.GA3377@elte.hu> (raw)
Linus,
Please pull the latest timer-fixes-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git timer-fixes-for-linus
The posix clocks change fixes a pretty bad latency regression introduced in
this cycle. (In hindsight this information should have been in the changelog)
Thanks,
Ingo
------------------>
Axel Lin (1):
RTC: rtc-omap: Fix a leak of the IRQ during init failure
Richard Cochran (1):
posix clocks: Replace mutex with reader/writer semaphore
drivers/rtc/rtc-omap.c | 2 +-
include/linux/posix-clock.h | 5 +++--
kernel/time/posix-clock.c | 24 +++++++++---------------
3 files changed, 13 insertions(+), 18 deletions(-)
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index de0dd7b..bcae8dd 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -394,7 +394,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
return 0;
fail2:
- free_irq(omap_rtc_timer, NULL);
+ free_irq(omap_rtc_timer, rtc);
fail1:
rtc_device_unregister(rtc);
fail0:
diff --git a/include/linux/posix-clock.h b/include/linux/posix-clock.h
index 369e19d..7f1183d 100644
--- a/include/linux/posix-clock.h
+++ b/include/linux/posix-clock.h
@@ -24,6 +24,7 @@
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/posix-timers.h>
+#include <linux/rwsem.h>
struct posix_clock;
@@ -104,7 +105,7 @@ struct posix_clock_operations {
* @ops: Functional interface to the clock
* @cdev: Character device instance for this clock
* @kref: Reference count.
- * @mutex: Protects the 'zombie' field from concurrent access.
+ * @rwsem: Protects the 'zombie' field from concurrent access.
* @zombie: If 'zombie' is true, then the hardware has disappeared.
* @release: A function to free the structure when the reference count reaches
* zero. May be NULL if structure is statically allocated.
@@ -117,7 +118,7 @@ struct posix_clock {
struct posix_clock_operations ops;
struct cdev cdev;
struct kref kref;
- struct mutex mutex;
+ struct rw_semaphore rwsem;
bool zombie;
void (*release)(struct posix_clock *clk);
};
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index 25028dd..c340ca6 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -19,7 +19,6 @@
*/
#include <linux/device.h>
#include <linux/file.h>
-#include <linux/mutex.h>
#include <linux/posix-clock.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
@@ -34,19 +33,19 @@ static struct posix_clock *get_posix_clock(struct file *fp)
{
struct posix_clock *clk = fp->private_data;
- mutex_lock(&clk->mutex);
+ down_read(&clk->rwsem);
if (!clk->zombie)
return clk;
- mutex_unlock(&clk->mutex);
+ up_read(&clk->rwsem);
return NULL;
}
static void put_posix_clock(struct posix_clock *clk)
{
- mutex_unlock(&clk->mutex);
+ up_read(&clk->rwsem);
}
static ssize_t posix_clock_read(struct file *fp, char __user *buf,
@@ -156,7 +155,7 @@ static int posix_clock_open(struct inode *inode, struct file *fp)
struct posix_clock *clk =
container_of(inode->i_cdev, struct posix_clock, cdev);
- mutex_lock(&clk->mutex);
+ down_read(&clk->rwsem);
if (clk->zombie) {
err = -ENODEV;
@@ -172,7 +171,7 @@ static int posix_clock_open(struct inode *inode, struct file *fp)
fp->private_data = clk;
}
out:
- mutex_unlock(&clk->mutex);
+ up_read(&clk->rwsem);
return err;
}
@@ -211,25 +210,20 @@ int posix_clock_register(struct posix_clock *clk, dev_t devid)
int err;
kref_init(&clk->kref);
- mutex_init(&clk->mutex);
+ init_rwsem(&clk->rwsem);
cdev_init(&clk->cdev, &posix_clock_file_operations);
clk->cdev.owner = clk->ops.owner;
err = cdev_add(&clk->cdev, devid, 1);
- if (err)
- goto no_cdev;
return err;
-no_cdev:
- mutex_destroy(&clk->mutex);
- return err;
}
EXPORT_SYMBOL_GPL(posix_clock_register);
static void delete_clock(struct kref *kref)
{
struct posix_clock *clk = container_of(kref, struct posix_clock, kref);
- mutex_destroy(&clk->mutex);
+
if (clk->release)
clk->release(clk);
}
@@ -238,9 +232,9 @@ void posix_clock_unregister(struct posix_clock *clk)
{
cdev_del(&clk->cdev);
- mutex_lock(&clk->mutex);
+ down_write(&clk->rwsem);
clk->zombie = true;
- mutex_unlock(&clk->mutex);
+ up_write(&clk->rwsem);
kref_put(&clk->kref, delete_clock);
}
next reply other threads:[~2011-04-19 16:03 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-19 16:03 Ingo Molnar [this message]
-- strict thread matches above, loose matches on Subject: below --
2024-04-14 8:42 [GIT PULL] timer fixes Ingo Molnar
2024-04-14 18:48 ` pr-tracker-bot
2024-04-07 8:03 Ingo Molnar
2024-04-07 16:44 ` pr-tracker-bot
2023-01-12 14:44 Ingo Molnar
2023-01-12 23:01 ` pr-tracker-bot
2022-08-13 10:25 Ingo Molnar
2022-08-13 16:25 ` Borislav Petkov
2022-08-13 20:27 ` Linus Torvalds
2022-08-14 8:57 ` Ingo Molnar
2022-08-14 12:41 ` Borislav Petkov
2022-08-14 17:24 ` Paul E. McKenney
2022-08-14 17:42 ` Borislav Petkov
2022-08-13 21:48 ` pr-tracker-bot
2020-12-27 9:26 Ingo Molnar
2020-12-27 17:27 ` pr-tracker-bot
2019-12-17 11:55 Ingo Molnar
2019-12-17 19:14 ` Linus Torvalds
2019-12-17 19:30 ` Peter Zijlstra
2019-12-17 20:16 ` Linus Torvalds
2019-12-17 20:35 ` Peter Zijlstra
2019-12-17 20:43 ` Linus Torvalds
2019-12-17 20:54 ` Peter Zijlstra
2019-12-17 19:20 ` pr-tracker-bot
2019-05-16 16:09 Ingo Molnar
2019-05-16 18:20 ` pr-tracker-bot
2019-04-20 7:45 Ingo Molnar
2019-04-20 19:25 ` pr-tracker-bot
2018-07-13 20:01 Ingo Molnar
2017-03-07 20:36 Ingo Molnar
2016-10-28 8:38 Ingo Molnar
2016-08-18 20:46 Ingo Molnar
2016-08-12 19:43 Ingo Molnar
2016-01-14 10:12 Ingo Molnar
2015-10-03 10:20 Ingo Molnar
2015-09-17 8:13 Ingo Molnar
2015-03-28 13:50 Ingo Molnar
2015-03-17 16:50 Ingo Molnar
2015-03-01 17:06 Ingo Molnar
2013-12-17 13:52 Ingo Molnar
2013-09-28 18:19 Ingo Molnar
2013-08-19 9:41 Ingo Molnar
2013-02-26 11:32 Ingo Molnar
2012-09-21 19:12 Ingo Molnar
2012-08-03 16:47 Ingo Molnar
2011-12-20 19:25 Ingo Molnar
2011-12-05 19:00 Ingo Molnar
2011-06-19 8:51 Ingo Molnar
2011-06-13 9:55 Ingo Molnar
2011-06-06 19:10 [GIT pull] " Thomas Gleixner
2011-05-20 17:52 Thomas Gleixner
2011-04-16 10:09 [GIT PULL] " Ingo Molnar
2011-04-07 17:42 Ingo Molnar
2011-02-06 12:06 Ingo Molnar
2011-01-24 13:24 Ingo Molnar
2010-11-26 13:40 Ingo Molnar
2010-03-26 15:34 Ingo Molnar
2009-12-18 18:49 Ingo Molnar
2009-10-08 18:35 Ingo Molnar
2009-08-25 18:04 Ingo Molnar
2009-06-26 19:03 Ingo Molnar
2009-04-09 15:43 Ingo Molnar
2009-01-30 23:07 [git pull] " Ingo Molnar
2009-01-26 17:21 Ingo Molnar
2009-01-06 16:18 Ingo Molnar
2008-12-04 20:52 Ingo Molnar
2008-11-11 18:47 Ingo Molnar
2008-09-23 19:41 Ingo Molnar
2008-09-17 9:59 Ingo Molnar
2008-08-25 17:52 Ingo Molnar
2008-08-22 12:24 Ingo Molnar
2008-07-24 15:18 Ingo Molnar
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