timers: Document meaning of deferrable timer
Steal some text from 6e453a67 "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: NJ. Bruce Fields <bfields@citi.umich.edu> Cc: johnstul@us.ibm.com Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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