kmemleak: Handle percpu memory allocation

This patch adds kmemleak callbacks from the percpu allocator, reducing a
number of false positives caused by kmemleak not scanning such memory
blocks. The percpu chunks are never reported as leaks because of current
kmemleak limitations with the __percpu pointer not pointing directly to
the actual chunks.

Reported-by: Huajun Li <huajun.li.lee@gmail.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
index 99d9a6766f7e..2a5e5548a1d2 100644
--- a/include/linux/kmemleak.h
+++ b/include/linux/kmemleak.h
@@ -26,8 +26,10 @@
 extern void kmemleak_init(void) __ref;
 extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,
                            gfp_t gfp) __ref;
+extern void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size) __ref;
 extern void kmemleak_free(const void *ptr) __ref;
 extern void kmemleak_free_part(const void *ptr, size_t size) __ref;
+extern void kmemleak_free_percpu(const void __percpu *ptr) __ref;
 extern void kmemleak_padding(const void *ptr, unsigned long offset,
                              size_t size) __ref;
 extern void kmemleak_not_leak(const void *ptr) __ref;
@@ -68,6 +70,9 @@ static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
                                             gfp_t gfp)
 {
 }
+static inline void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size)
+{
+}
 static inline void kmemleak_free(const void *ptr)
 {
 }
@@ -77,6 +82,9 @@ static inline void kmemleak_free_part(const void *ptr, size_t size)
 static inline void kmemleak_free_recursive(const void *ptr, unsigned long flags)
 {
 }
+static inline void kmemleak_free_percpu(const void __percpu *ptr)
+{
+}
 static inline void kmemleak_not_leak(const void *ptr)
 {
 }