linux-kernel - [PATCH 11/12] kasan: always inline HW

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Date:   Mon,  1 Feb 2021 20:43:35 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 11/12] kasan: always inline HW_TAGS helper functions

Mark all static functions in common.c and kasan.h that are used for
hardware tag-based KASAN as __always_inline to avoid unnecessary
function calls.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/common.c | 13 +++++++------
 mm/kasan/kasan.h  |  6 +++---
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 5691cca69397..2004ecd6e43c 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -279,7 +279,8 @@ void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
  *    based on objects indexes, so that objects that are next to each other
  *    get different tags.
  */
-static u8 assign_tag(struct kmem_cache *cache, const void *object, bool init)
+static __always_inline u8 assign_tag(struct kmem_cache *cache,
+					const void *object, bool init)
 {
 	if (IS_ENABLED(CONFIG_KASAN_GENERIC))
 		return 0xff;
@@ -321,8 +322,8 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
 	return (void *)object;
 }
 
-static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
-			      unsigned long ip, bool quarantine)
+static __always_inline bool ____kasan_slab_free(struct kmem_cache *cache,
+				void *object, unsigned long ip, bool quarantine)
 {
 	u8 tag;
 	void *tagged_object;
@@ -366,7 +367,7 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
 	return ____kasan_slab_free(cache, object, ip, true);
 }
 
-static bool ____kasan_kfree_large(void *ptr, unsigned long ip)
+static __always_inline bool ____kasan_kfree_large(void *ptr, unsigned long ip)
 {
 	if (ptr != page_address(virt_to_head_page(ptr))) {
 		kasan_report_invalid_free(ptr, ip);
@@ -461,8 +462,8 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
 	return tagged_object;
 }
 
-static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
-					size_t size, gfp_t flags)
+static __always_inline void *____kasan_kmalloc(struct kmem_cache *cache,
+				const void *object, size_t size, gfp_t flags)
 {
 	unsigned long redzone_start;
 	unsigned long redzone_end;
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 2f7400a3412f..d5fe72747a53 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -321,7 +321,7 @@ static inline u8 kasan_random_tag(void) { return 0; }
 
 #ifdef CONFIG_KASAN_HW_TAGS
 
-static inline void kasan_poison(const void *addr, size_t size, u8 value)
+static __always_inline void kasan_poison(const void *addr, size_t size, u8 value)
 {
 	addr = kasan_reset_tag(addr);
 
@@ -337,7 +337,7 @@ static inline void kasan_poison(const void *addr, size_t size, u8 value)
 	hw_set_mem_tag_range((void *)addr, size, value);
 }
 
-static inline void kasan_unpoison(const void *addr, size_t size)
+static __always_inline void kasan_unpoison(const void *addr, size_t size)
 {
 	u8 tag = get_tag(addr);
 
@@ -354,7 +354,7 @@ static inline void kasan_unpoison(const void *addr, size_t size)
 	hw_set_mem_tag_range((void *)addr, size, tag);
 }
 
-static inline bool kasan_byte_accessible(const void *addr)
+static __always_inline bool kasan_byte_accessible(const void *addr)
 {
 	u8 ptr_tag = get_tag(addr);
 	u8 mem_tag = hw_get_mem_tag((void *)addr);
-- 
2.30.0.365.g02bc693789-goog