[PATCH RFC 11/15] mm/slab: pass slab_alloc_context to __do_kmalloc_node()

[Vlastimil Babka (SUSE)]

With alloc_flags usage in slab, we can replace __GFP_NO_OBJ_EXT with an
alloc flag that prevents kmalloc recursion. For that we need a version
of kmalloc() that takes alloc_flags and use it in places that perform
these potentially recursive kmalloc allocations (of sheaves or obj_ext
arrays).

As a preparatory step, make __do_kmalloc_node() take a pointer to
slab_alloc_context. This replaces the 'caller' parameter and includes
alloc_flags which we'll make use of.

Signed-off-by: Vlastimil Babka (SUSE) <vbabka@xxxxxxxxxx>
---
 mm/slub.c | 47 ++++++++++++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 15 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index dee69e0b7780..c11edd58b52d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5322,19 +5322,14 @@ EXPORT_SYMBOL(__kmalloc_large_node_noprof);
 
 static __always_inline
 void *__do_kmalloc_node(size_t size, kmem_buckets *b, gfp_t flags, int node,
-			unsigned long caller, kmalloc_token_t token)
+			kmalloc_token_t token, struct slab_alloc_context *ac)
 {
 	struct kmem_cache *s;
 	void *ret;
-	struct slab_alloc_context ac = {
-		.caller_addr = caller,
-		.orig_size = size,
-		.alloc_flags = SLAB_ALLOC_DEFAULT,
-	};
 
 	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
 		ret = __kmalloc_large_node_noprof(size, flags, node);
-		trace_kmalloc(caller, ret, size,
+		trace_kmalloc(ac->caller_addr, ret, size,
 			      PAGE_SIZE << get_order(size), flags, node);
 		return ret;
 	}
@@ -5344,22 +5339,34 @@ void *__do_kmalloc_node(size_t size, kmem_buckets *b, gfp_t flags, int node,
 
 	s = kmalloc_slab(size, b, flags, token);
 
-	ret = slab_alloc_node(s, flags, node, &ac);
+	ret = slab_alloc_node(s, flags, node, ac);
 	ret = kasan_kmalloc(s, ret, size, flags);
-	trace_kmalloc(caller, ret, size, s->size, flags, node);
+	trace_kmalloc(ac->caller_addr, ret, size, s->size, flags, node);
 	return ret;
 }
 void *__kmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node)
 {
+	struct slab_alloc_context ac = {
+		.caller_addr = _RET_IP_,
+		.orig_size = size,
+		.alloc_flags = SLAB_ALLOC_DEFAULT,
+	};
+
 	return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node,
-				 _RET_IP_, PASS_TOKEN_PARAM(token));
+				 PASS_TOKEN_PARAM(token), &ac);
 }
 EXPORT_SYMBOL(__kmalloc_node_noprof);
 
 void *__kmalloc_noprof(DECL_TOKEN_PARAMS(size, token), gfp_t flags)
 {
-	return __do_kmalloc_node(size, NULL, flags,  NUMA_NO_NODE, _RET_IP_,
-				 PASS_TOKEN_PARAM(token));
+	struct slab_alloc_context ac = {
+		.caller_addr = _RET_IP_,
+		.orig_size = size,
+		.alloc_flags = SLAB_ALLOC_DEFAULT,
+	};
+
+	return __do_kmalloc_node(size, NULL, flags,  NUMA_NO_NODE,
+				 PASS_TOKEN_PARAM(token), &ac);
 }
 EXPORT_SYMBOL(__kmalloc_noprof);
 
@@ -5455,9 +5462,14 @@ EXPORT_SYMBOL_GPL(_kmalloc_nolock_noprof);
 void *__kmalloc_node_track_caller_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags,
 					 int node, unsigned long caller)
 {
-	return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node,
-				 caller, PASS_TOKEN_PARAM(token));
+	struct slab_alloc_context ac = {
+		.caller_addr = caller,
+		.orig_size = size,
+		.alloc_flags = SLAB_ALLOC_DEFAULT,
+	};
 
+	return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node,
+				 PASS_TOKEN_PARAM(token), &ac);
 }
 EXPORT_SYMBOL(__kmalloc_node_track_caller_noprof);
 
@@ -6858,6 +6870,11 @@ void *__kvmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), unsigned long
 {
 	bool allow_block;
 	void *ret;
+	struct slab_alloc_context ac = {
+		.caller_addr = _RET_IP_,
+		.orig_size = size,
+		.alloc_flags = SLAB_ALLOC_DEFAULT,
+	};
 
 	/*
 	 * It doesn't really make sense to fallback to vmalloc for sub page
@@ -6865,7 +6882,7 @@ void *__kvmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), unsigned long
 	 */
 	ret = __do_kmalloc_node(size, PASS_BUCKET_PARAM(b),
 				kmalloc_gfp_adjust(flags, size),
-				node, _RET_IP_, PASS_TOKEN_PARAM(token));
+				node, PASS_TOKEN_PARAM(token), &ac);
 	if (ret || size <= PAGE_SIZE)
 		return ret;
 

-- 
2.54.0