mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using

Drop kmem_alloc event class, and define kmalloc and kmem_cache_alloc
using TRACE_EVENT() macro.

And then this patch does:
   - Do not pass pointer to struct kmem_cache to trace_kmalloc.
     gfp flag is enough to know if it's accounted or not.
   - Avoid dereferencing s->object_size and s->size when not using kmem_cache_alloc event.
   - Avoid dereferencing s->name in when not using kmem_cache_free event.
   - Adjust s->size to SLOB_UNITS(s->size) * SLOB_UNIT in SLOB

Cc: Vasily Averin <vasily.averin@linux.dev>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

1 files changed, 8 insertions, 8 deletions

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 3d7ad992ece1..ad4c36fb697c 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -907,7 +907,7 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller
 
 	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
 		ret = __kmalloc_large_node(size, flags, node);
-		trace_kmalloc(_RET_IP_, ret, NULL, size,
+		trace_kmalloc(_RET_IP_, ret, size,
 			      PAGE_SIZE << get_order(size), flags, node);
 		return ret;
 	}
@@ -919,7 +919,7 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller
 
 	ret = __kmem_cache_alloc_node(s, flags, node, size, caller);
 	ret = kasan_kmalloc(s, ret, size, flags);
-	trace_kmalloc(_RET_IP_, ret, s, size, s->size, flags, node);
+	trace_kmalloc(_RET_IP_, ret, size, s->size, flags, node);
 	return ret;
 }
 
@@ -1005,7 +1005,7 @@ void *kmalloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
 	void *ret = __kmem_cache_alloc_node(s, gfpflags, NUMA_NO_NODE,
 					    size, _RET_IP_);
 
-	trace_kmalloc(_RET_IP_, ret, s, size, s->size, gfpflags, NUMA_NO_NODE);
+	trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, NUMA_NO_NODE);
 
 	ret = kasan_kmalloc(s, ret, size, gfpflags);
 	return ret;
@@ -1017,7 +1017,7 @@ void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
 {
 	void *ret = __kmem_cache_alloc_node(s, gfpflags, node, size, _RET_IP_);
 
-	trace_kmalloc(_RET_IP_, ret, s, size, s->size, gfpflags, node);
+	trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, node);
 
 	ret = kasan_kmalloc(s, ret, size, gfpflags);
 	return ret;
@@ -1072,8 +1072,8 @@ void *kmalloc_large(size_t size, gfp_t flags)
 {
 	void *ret = __kmalloc_large_node(size, flags, NUMA_NO_NODE);
 
-	trace_kmalloc(_RET_IP_, ret, NULL, size,
-		      PAGE_SIZE << get_order(size), flags, NUMA_NO_NODE);
+	trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
+		      flags, NUMA_NO_NODE);
 	return ret;
 }
 EXPORT_SYMBOL(kmalloc_large);
@@ -1082,8 +1082,8 @@ void *kmalloc_large_node(size_t size, gfp_t flags, int node)
 {
 	void *ret = __kmalloc_large_node(size, flags, node);
 
-	trace_kmalloc(_RET_IP_, ret, NULL, size,
-		      PAGE_SIZE << get_order(size), flags, node);
+	trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
+		      flags, node);
 	return ret;
 }
 EXPORT_SYMBOL(kmalloc_large_node);