timers: Document meaning of deferrable timer (866e2611) · Commits · 戴 / test

Steal some text from "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>

kernel/timer.c

+7 −2

Original line number	Original line	Diff line number	Diff line
	@@ -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		* 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		* base in timer_list is guaranteed to be zero. Use the LSB to
	* the new flag to indicate whether the timer is deferrable		* 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)		#define TBASE_DEFERRABLE_FLAG (0x1)

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