linux-kernel - [PATCH v2 21/23] mm/sl[au]b: remove kmem_cache_alloc_node

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Date:   Thu, 14 Apr 2022 17:57:25 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 21/23] mm/sl[au]b: remove kmem_cache_alloc_node_trace()

kmem_cache_alloc_node_trace() was introduced by commit 4a92379bdfb4
("slub tracing: move trace calls out of always inlined functions to reduce
kernel code size") to avoid inlining tracepoints for inlined kmalloc
function calls.

Now that we use same tracepoint in kmalloc and normal caches,
kmem_cache_alloc_node_trace() can be replaced with
__kmem_cache_alloc_node() and kasan_kmalloc().

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
---
 include/linux/slab.h | 26 ++++++++------------------
 mm/slab.c            | 19 -------------------
 mm/slub.c            | 16 ----------------
 3 files changed, 8 insertions(+), 53 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 0630c37ee630..c1aed9d97cf2 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -497,21 +497,6 @@ static __always_inline void kfree_bulk(size_t size, void **p)
 	kmem_cache_free_bulk(NULL, size, p);
 }
 
-#ifdef CONFIG_TRACING
-extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
-					 int node, size_t size) __assume_slab_alignment
-								__alloc_size(4);
-#else /* CONFIG_TRACING */
-static __always_inline void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
-							 int node, size_t size)
-{
-	void *ret = kmem_cache_alloc_node(s, gfpflags, node);
-
-	ret = kasan_kmalloc(s, ret, size, gfpflags);
-	return ret;
-}
-#endif /* CONFIG_TRACING */
-
 extern void *kmalloc_large_node(size_t size, gfp_t flags, int node)
 				__assume_page_alignment __alloc_size(1);
 
@@ -523,6 +508,9 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
 #ifndef CONFIG_SLOB
 static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
+	struct kmem_cache *s;
+	void *objp;
+
 	if (__builtin_constant_p(size)) {
 		unsigned int index;
 
@@ -534,9 +522,11 @@ static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t fla
 		if (!index)
 			return ZERO_SIZE_PTR;
 
-		return kmem_cache_alloc_node_trace(
-				kmalloc_caches[kmalloc_type(flags)][index],
-						flags, node, size);
+		s = kmalloc_caches[kmalloc_type(flags)][index];
+
+		objp = __kmem_cache_alloc_node(s, NULL, flags, node, _RET_IP_);
+		objp = kasan_kmalloc(s, objp, size, flags);
+		return objp;
 	}
 	return __kmalloc_node(size, flags, node);
 }
diff --git a/mm/slab.c b/mm/slab.c
index fc00aca62ae3..24010e72f603 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3508,25 +3508,6 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
 }
 EXPORT_SYMBOL(kmem_cache_alloc_bulk);
 
-#ifdef CONFIG_TRACING
-void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
-				  gfp_t flags,
-				  int nodeid,
-				  size_t size)
-{
-	void *ret;
-
-	ret = slab_alloc_node(cachep, NULL, flags, nodeid, size, _RET_IP_);
-
-	ret = kasan_kmalloc(cachep, ret, size, flags);
-	trace_kmem_cache_alloc(cachep->name, _RET_IP_, ret,
-			       size, cachep->size,
-			       flags, nodeid);
-	return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
-#endif
-
 #ifdef CONFIG_PRINTK
 void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
 {
diff --git a/mm/slub.c b/mm/slub.c
index bc9c96ce0521..1899c7e1de10 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3222,22 +3222,6 @@ void *__kmem_cache_alloc_node(struct kmem_cache *s, struct list_lru *lru, gfp_t
 }
 EXPORT_SYMBOL(__kmem_cache_alloc_node);
 
-#ifdef CONFIG_TRACING
-void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
-				    gfp_t gfpflags,
-				    int node, size_t size)
-{
-	void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, size);
-
-	trace_kmem_cache_alloc(s->name, _RET_IP_, ret,
-			       size, s->size, gfpflags, node);
-
-	ret = kasan_kmalloc(s, ret, size, gfpflags);
-	return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
-#endif
-
 /*
  * Slow path handling. This may still be called frequently since objects
  * have a longer lifetime than the cpu slabs in most processing loads.
-- 
2.32.0