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authorLiu Hua <sdu.liu@huawei.com>2014-04-07 15:38:57 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-06 07:59:35 -0700
commitdfe468daba552b4d474db75ff54562691150bb78 (patch)
tree7248942c8852c6c37297fd3b2dcfd43fa2d310a3 /Documentation
parent05b36270c305cf8e4d0d2b29b89c42f7ecd77d1c (diff)
downloadlwn-dfe468daba552b4d474db75ff54562691150bb78.tar.gz
lwn-dfe468daba552b4d474db75ff54562691150bb78.zip
hung_task: check the value of "sysctl_hung_task_timeout_sec"
commit 80df28476505ed4e6701c3448c63c9229a50c655 upstream. As sysctl_hung_task_timeout_sec is unsigned long, when this value is larger then LONG_MAX/HZ, the function schedule_timeout_interruptible in watchdog will return immediately without sleep and with print : schedule_timeout: wrong timeout value ffffffffffffff83 and then the funtion watchdog will call schedule_timeout_interruptible again and again. The screen will be filled with "schedule_timeout: wrong timeout value ffffffffffffff83" This patch does some check and correction in sysctl, to let the function schedule_timeout_interruptible allways get the valid parameter. Signed-off-by: Liu Hua <sdu.liu@huawei.com> Tested-by: Satoru Takeuchi <satoru.takeuchi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/sysctl/kernel.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index e55124e7c40c..855d9b37bf76 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -317,6 +317,7 @@ for more than this value report a warning.
This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
0: means infinite timeout - no checking done.
+Possible values to set are in range {0..LONG_MAX/HZ}.
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