mm, slab: Replace 'caller' type, void* -> unsigned long

This allows to use _RET_IP_ instead of builtin_address(0), thus
achiveing implementation consistency in all three allocators.
Though maybe a nitpick, the real goal behind this patch is
to be able to obtain common code between SLAB and SLUB.

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 24 insertions, 26 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 7072848701e0..6c356793612d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3084,7 +3084,7 @@ static inline void verify_redzone_free(struct kmem_cache *cache, void *obj)
 }
 
 static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
-                                   void *caller)
+                                   unsigned long caller)
 {
         struct page *page;
         unsigned int objnr;
@@ -3104,7 +3104,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
                 *dbg_redzone2(cachep, objp) = RED_INACTIVE;
         }
         if (cachep->flags & SLAB_STORE_USER)
-                *dbg_userword(cachep, objp) = caller;
+                *dbg_userword(cachep, objp) = (void *)caller;
 
         objnr = obj_to_index(cachep, slabp, objp);
 
@@ -3117,7 +3117,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
         if (cachep->flags & SLAB_POISON) {
 #ifdef CONFIG_DEBUG_PAGEALLOC
                 if ((cachep->size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) {
-                        store_stackinfo(cachep, objp, (unsigned long)caller);
+                        store_stackinfo(cachep, objp, caller);
                         kernel_map_pages(virt_to_page(objp),
                                          cachep->size / PAGE_SIZE, 0);
                 } else {
@@ -3270,7 +3270,7 @@ static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep,
 
 #if DEBUG
 static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
-                                gfp_t flags, void *objp, void *caller)
+                                gfp_t flags, void *objp, unsigned long caller)
 {
         if (!objp)
                 return objp;
@@ -3287,7 +3287,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
                 poison_obj(cachep, objp, POISON_INUSE);
         }
         if (cachep->flags & SLAB_STORE_USER)
-                *dbg_userword(cachep, objp) = caller;
+                *dbg_userword(cachep, objp) = (void *)caller;
 
         if (cachep->flags & SLAB_RED_ZONE) {
                 if (*dbg_redzone1(cachep, objp) != RED_INACTIVE ||
@@ -3562,7 +3562,7 @@ done:
  */
 static __always_inline void *
 __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
-                   void *caller)
+                   unsigned long caller)
 {
         unsigned long save_flags;
         void *ptr;
@@ -3648,7 +3648,7 @@ __do_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
 #endif /* CONFIG_NUMA */
 
 static __always_inline void *
-__cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
+__cache_alloc(struct kmem_cache *cachep, gfp_t flags, unsigned long caller)
 {
         unsigned long save_flags;
         void *objp;
@@ -3784,7 +3784,7 @@ free_done:
  * be in this state _before_ it is released.  Called with disabled ints.
  */
 static inline void __cache_free(struct kmem_cache *cachep, void *objp,
-    void *caller)
+                                unsigned long caller)
 {
         struct array_cache *ac = cpu_cache_get(cachep);
 
@@ -3824,7 +3824,7 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp,
  */
 void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
 {
-        void *ret = __cache_alloc(cachep, flags, __builtin_return_address(0));
+        void *ret = __cache_alloc(cachep, flags, _RET_IP_);
 
         trace_kmem_cache_alloc(_RET_IP_, ret,
                                cachep->object_size, cachep->size, flags);
@@ -3839,7 +3839,7 @@ kmem_cache_alloc_trace(size_t size, struct kmem_cache *cachep, gfp_t flags)
 {
         void *ret;
 
-        ret = __cache_alloc(cachep, flags, __builtin_return_address(0));
+        ret = __cache_alloc(cachep, flags, _RET_IP_);
 
         trace_kmalloc(_RET_IP_, ret,
                       size, cachep->size, flags);
@@ -3851,8 +3851,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_trace);
 #ifdef CONFIG_NUMA
 void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
 {
-        void *ret = __cache_alloc_node(cachep, flags, nodeid,
-                                       __builtin_return_address(0));
+        void *ret = __cache_alloc_node(cachep, flags, nodeid, _RET_IP_);
 
         trace_kmem_cache_alloc_node(_RET_IP_, ret,
                                     cachep->object_size, cachep->size,
@@ -3870,8 +3869,8 @@ void *kmem_cache_alloc_node_trace(size_t size,
 {
         void *ret;
 
-        ret = __cache_alloc_node(cachep, flags, nodeid,
-                                  __builtin_return_address(0));
+        ret = __cache_alloc_node(cachep, flags, nodeid, _RET_IP);
+
         trace_kmalloc_node(_RET_IP_, ret,
                            size, cachep->size,
                            flags, nodeid);
@@ -3881,7 +3880,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
 #endif
 
 static __always_inline void *
-__do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller)
+__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller)
 {
         struct kmem_cache *cachep;
 
@@ -3894,21 +3893,20 @@ __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller)
 #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING)
 void *__kmalloc_node(size_t size, gfp_t flags, int node)
 {
-        return __do_kmalloc_node(size, flags, node,
-                        __builtin_return_address(0));
+        return __do_kmalloc_node(size, flags, node, _RET_IP_);
 }
 EXPORT_SYMBOL(__kmalloc_node);
 
 void *__kmalloc_node_track_caller(size_t size, gfp_t flags,
                 int node, unsigned long caller)
 {
-        return __do_kmalloc_node(size, flags, node, (void *)caller);
+        return __do_kmalloc_node(size, flags, node, caller);
 }
 EXPORT_SYMBOL(__kmalloc_node_track_caller);
 #else
 void *__kmalloc_node(size_t size, gfp_t flags, int node)
 {
-        return __do_kmalloc_node(size, flags, node, NULL);
+        return __do_kmalloc_node(size, flags, node, 0);
 }
 EXPORT_SYMBOL(__kmalloc_node);
 #endif /* CONFIG_DEBUG_SLAB || CONFIG_TRACING */
@@ -3921,7 +3919,7 @@ EXPORT_SYMBOL(__kmalloc_node);
  * @caller: function caller for debug tracking of the caller
  */
 static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
-                                          void *caller)
+                                          unsigned long caller)
 {
         struct kmem_cache *cachep;
         void *ret;
@@ -3936,7 +3934,7 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
                 return cachep;
         ret = __cache_alloc(cachep, flags, caller);
 
-        trace_kmalloc((unsigned long) caller, ret,
+        trace_kmalloc(caller, ret,
                       size, cachep->size, flags);
 
         return ret;
@@ -3946,20 +3944,20 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
 #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING)
 void *__kmalloc(size_t size, gfp_t flags)
 {
-        return __do_kmalloc(size, flags, __builtin_return_address(0));
+        return __do_kmalloc(size, flags, _RET_IP_);
 }
 EXPORT_SYMBOL(__kmalloc);
 
 void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller)
 {
-        return __do_kmalloc(size, flags, (void *)caller);
+        return __do_kmalloc(size, flags, caller);
 }
 EXPORT_SYMBOL(__kmalloc_track_caller);
 
 #else
 void *__kmalloc(size_t size, gfp_t flags)
 {
-        return __do_kmalloc(size, flags, NULL);
+        return __do_kmalloc(size, flags, 0);
 }
 EXPORT_SYMBOL(__kmalloc);
 #endif
@@ -3980,7 +3978,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
         debug_check_no_locks_freed(objp, cachep->object_size);
         if (!(cachep->flags & SLAB_DEBUG_OBJECTS))
                 debug_check_no_obj_freed(objp, cachep->object_size);
-        __cache_free(cachep, objp, __builtin_return_address(0));
+        __cache_free(cachep, objp, _RET_IP_);
         local_irq_restore(flags);
 
         trace_kmem_cache_free(_RET_IP_, objp);
@@ -4011,7 +4009,7 @@ void kfree(const void *objp)
         debug_check_no_locks_freed(objp, c->object_size);
 
         debug_check_no_obj_freed(objp, c->object_size);
-        __cache_free(c, (void *)objp, __builtin_return_address(0));
+        __cache_free(c, (void *)objp, _RET_IP_);
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(kfree);