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From:   Vlastimil Babka <vbabka@suse.cz>
Date:   Mon, 20 Nov 2023 19:34:30 +0100
Subject: [PATCH v2 19/21] mm/slub: remove slab_alloc() and
 __kmem_cache_alloc_lru() wrappers
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Message-Id: <20231120-slab-remove-slab-v2-19-9c9c70177183@suse.cz>
References: <20231120-slab-remove-slab-v2-0-9c9c70177183@suse.cz>
In-Reply-To: <20231120-slab-remove-slab-v2-0-9c9c70177183@suse.cz>
To:     David Rientjes <rientjes@google.com>,
        Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Marco Elver <elver@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Shakeel Butt <shakeelb@google.com>,
        Muchun Song <muchun.song@linux.dev>,
        Kees Cook <keescook@chromium.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
        cgroups@vger.kernel.org, linux-hardening@vger.kernel.org,
        Vlastimil Babka <vbabka@suse.cz>
Precedence: bulk

slab_alloc() is a thin wrapper around slab_alloc_node() with only one
caller.  Replace with direct call of slab_alloc_node().
__kmem_cache_alloc_lru() itself is a thin wrapper with two callers,
so replace it with direct calls of slab_alloc_node() and
trace_kmem_cache_alloc().

This also makes sure _RET_IP_ has always the expected value and not
depending on inlining decisions.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
 mm/slub.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index d6bc15929d22..5683f1d02e4f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3821,33 +3821,26 @@ static __fastpath_inline void *slab_alloc_node(struct kmem_cache *s, struct list
 	return object;
 }
 
-static __fastpath_inline void *slab_alloc(struct kmem_cache *s, struct list_lru *lru,
-		gfp_t gfpflags, unsigned long addr, size_t orig_size)
-{
-	return slab_alloc_node(s, lru, gfpflags, NUMA_NO_NODE, addr, orig_size);
-}
-
-static __fastpath_inline
-void *__kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
-			     gfp_t gfpflags)
+void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
 {
-	void *ret = slab_alloc(s, lru, gfpflags, _RET_IP_, s->object_size);
+	void *ret = slab_alloc_node(s, NULL, gfpflags, NUMA_NO_NODE, _RET_IP_,
+				    s->object_size);
 
 	trace_kmem_cache_alloc(_RET_IP_, ret, s, gfpflags, NUMA_NO_NODE);
 
 	return ret;
 }
-
-void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
-{
-	return __kmem_cache_alloc_lru(s, NULL, gfpflags);
-}
 EXPORT_SYMBOL(kmem_cache_alloc);
 
 void *kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
 			   gfp_t gfpflags)
 {
-	return __kmem_cache_alloc_lru(s, lru, gfpflags);
+	void *ret = slab_alloc_node(s, lru, gfpflags, NUMA_NO_NODE, _RET_IP_,
+				    s->object_size);
+
+	trace_kmem_cache_alloc(_RET_IP_, ret, s, gfpflags, NUMA_NO_NODE);
+
+	return ret;
 }
 EXPORT_SYMBOL(kmem_cache_alloc_lru);
 

-- 
2.42.1