Merge branch 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Pull percpu update from Tejun Heo:
 "This includes just one patch to reject non-power-of-2 alignments and
  trigger warning. Interestingly, this actually caught a bug in XEN
  ARM64"

* 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: ensure the requested alignment is power of two

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/percpu.c b/mm/percpu.c
index f696385bcc44..0686f566d347 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -886,7 +886,8 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
 
         size = ALIGN(size, 2);
 
-        if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE)) {
+        if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE ||
+                     !is_power_of_2(align))) {
                 WARN(true, "illegal size (%zu) or align (%zu) for percpu allocation\n",
                      size, align);
                 return NULL;