[PATCH v5 1/2] mm: introduce helper to check slub_debug_enabled
From: <hidden>
Date: 2021-07-05 02:41:23
Also in:
linux-mediatek, linux-mm, lkml
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
From: Marco Elver <elver@google.com> Introduce a helper to check slub_debug_enabled, so that we can confine the use of #ifdef to the definition of the slub_debug_enabled_unlikely() helper. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Yee Lee <redacted> --- mm/slab.h | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/mm/slab.h b/mm/slab.h
index 7b60ef2f32c3..a11126afe24c 100644
--- a/mm/slab.h
+++ b/mm/slab.h@@ -216,10 +216,18 @@ DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); #endif extern void print_tracking(struct kmem_cache *s, void *object); long validate_slab_cache(struct kmem_cache *s); +static inline bool slub_debug_enabled_unlikely(void) +{ + return static_branch_unlikely(&slub_debug_enabled); +} #else static inline void print_tracking(struct kmem_cache *s, void *object) { } +static inline bool slub_debug_enabled_unlikely(void) +{ + return false; +} #endif /*
@@ -229,11 +237,10 @@ static inline void print_tracking(struct kmem_cache *s, void *object) */ static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) { -#ifdef CONFIG_SLUB_DEBUG - VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); - if (static_branch_unlikely(&slub_debug_enabled)) + if (IS_ENABLED(CONFIG_SLUB_DEBUG)) + VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); + if (slub_debug_enabled_unlikely()) return s->flags & flags; -#endif return false; }
--
2.18.0
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