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percpu: fix how @gfp is interpreted by the percpu allocator 

When @gfp is specified, the percpu allocator is interested in whether
it contains all of GFP_KERNEL or not.  If it does, the normal
allocation path is taken; otherwise, the atomic allocation path.
Unfortunately, pcpu_alloc() was incorrectly testing for whether @gfp
contains any part of GFP_KERNEL.

Fix it by testing "(gfp & GFP_KERNEL) != GFP_KERNEL" instead of
"!(gfp & GFP_KERNEL)" to decide whether the allocation should be
atomic or not.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2014-10-08 12:01:52 -04:00
parent 17497acbdc
commit 6ae833c7fe
1 changed files with 1 additions and 1 deletions
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2
mm/percpu.c
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@ -876,7 +876,7 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
static int warn_limit = 10;
struct pcpu_chunk *chunk;
const char *err;
bool is_atomic = !(gfp & GFP_KERNEL);
bool is_atomic = (gfp & GFP_KERNEL) != GFP_KERNEL;
int occ_pages = 0;
int slot, off, new_alloc, cpu, ret;
unsigned long flags;