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timers: Document meaning of deferrable timer 

Steal some text from 6e453a6751 "Add support for deferrable timers".  A
reader shouldn't have to dig through the git logs for the basic
description of a deferrable timer.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Cc: johnstul@us.ibm.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
J. Bruce Fields 2010-07-20 15:23:15 -07:00 committed by Thomas Gleixner
parent b37fa16e78
commit 866e26115c
1 changed files with 7 additions and 2 deletions
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9
kernel/timer.c
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@ -90,8 +90,13 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
/*
* Note that all tvec_bases are 2 byte aligned and lower bit of
* base in timer_list is guaranteed to be zero. Use the LSB for
* the new flag to indicate whether the timer is deferrable
* base in timer_list is guaranteed to be zero. Use the LSB to
* indicate whether the timer is deferrable.
*
* A deferrable timer will work normally when the system is busy, but
* will not cause a CPU to come out of idle just to service it; instead,
* the timer will be serviced when the CPU eventually wakes up with a
* subsequent non-deferrable timer.
*/
#define TBASE_DEFERRABLE_FLAG (0x1)