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timer: Fix mod_timer_pinned() header comment

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The mod_timer_pinned() header comment states that it prevents timers
from being migrated to a different CPU.  This is not the case, instead,
it ensures that the timer is posted to the current CPU, but does nothing
to prevent CPU-hotplug operations from migrating the timer.

This commit therefore brings the comment header into alignment with
reality.

CRs-fixed: 657837
Change-Id: I244c4c385cd1c47df216feda7b580b2876fab723
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Git-commit: 048a0e8f5e1d94c01a5fc70f5b2f2fd2f4527326
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Ramesh Gupta Guntha <rggupt@codeaurora.org>
This commit is contained in:
Paul E. McKenney
2014-07-21 21:39:12 +05:30
committed by Ramesh Gupta Guntha
parent d3a00bb200
commit f7f43a5573
1 changed files with 7 additions and 1 deletions
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kernel/timer.c
+7 -1
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@@ -862,7 +862,13 @@ EXPORT_SYMBOL(mod_timer);
*
* mod_timer_pinned() is a way to update the expire field of an
* active timer (if the timer is inactive it will be activated)
* and not allow the timer to be migrated to a different CPU.
* and to ensure that the timer is scheduled on the current CPU.
*
* Note that this does not prevent the timer from being migrated
* when the current CPU goes offline. If this is a problem for
* you, use CPU-hotplug notifiers to handle it correctly, for
* example, cancelling the timer when the corresponding CPU goes
* offline.
*
* mod_timer_pinned(timer, expires) is equivalent to:
*