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>
diff --git a/mm/percpu.c b/mm/percpu.c
index e10f9f7..014bab6 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -876,7 +876,7 @@
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;