percpu: implement [__]alloc_percpu_gfp()

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Now that pcpu_alloc_area() can allocate only from populated areas,
it's easy to add atomic allocation support to [__]alloc_percpu().
Update pcpu_alloc() so that it accepts @gfp and skips all the blocking
operations and allocates only from the populated areas if @gfp doesn't
contain GFP_KERNEL.  New interface functions [__]alloc_percpu_gfp()
are added.

While this means that atomic allocations are possible, this isn't
complete yet as there's no mechanism to ensure that certain amount of
populated areas is kept available and atomic allocations may keep
failing under certain conditions.

Signed-off-by: Tejun Heo <tj@kernel.org>

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This commit is contained in:

Tejun Heo 2014-09-02 14:46:04 -04:00

parent e04d320838

commit 5835d96e9c

2 changed files with 46 additions and 27 deletions

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include/linux/percpu.h

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