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hung_task: Change sysctl_hung_task_check_count to 'int'

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As 'sysctl_hung_task_check_count' is 'unsigned long' when this
value is assigned to max_count in check_hung_uninterruptible_tasks(),
it's truncated to 'int' type.

This causes a minor artifact: if we write 2^32 to sysctl.hung_task_check_count,
hung task detection will be effectively disabled.

With this fix, it will still truncate the user input to 32 bits, but
reading sysctl.hung_task_check_count reflects the actual truncated value.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/523FFF4E.9050401@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Li Zefan 2013-09-23 16:43:58 +08:00 • committed by Ingo Molnar
parent d8524ae9d6
commit cd64647f04
3 changed files with 5 additions and 4 deletions
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2
kernel/hung_task.c
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@ -20,7 +20,7 @@
/*
* The number of tasks checked:
*/
unsigned long __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
int __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
/*
* Limit number of tasks checked in a batch.