[PATCH RFC 02/12] mm/slab: remove objs_per_slab()

["Vlastimil Babka (SUSE)" <vbabka@kernel.org>]

The function has an unused kmem_cache argument and almost nothing uses
it anyway; doing slab->objects is simpler. Remove it with the last two
users. KUNIT_EXPECT_EQ() needs a cast to avoid "error: ‘typeof’ applied
to a bit-field" but we don't need to keep a wrapper just for that.

Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
---
 mm/kfence/kfence_test.c | 2 +-
 mm/slab.h               | 6 ------
 mm/slub.c               | 3 +--
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
index de2d0f7d62b1..9867c03ef0ae 100644
--- a/mm/kfence/kfence_test.c
+++ b/mm/kfence/kfence_test.c
@@ -295,7 +295,7 @@ static void *test_alloc(struct kunit *test, size_t size, gfp_t gfp, enum allocat
 			 * memcg accounting works correctly.
 			 */
 			KUNIT_EXPECT_EQ(test, obj_to_index(s, slab, alloc), 0U);
-			KUNIT_EXPECT_EQ(test, objs_per_slab(s, slab), 1);
+			KUNIT_EXPECT_EQ(test, ((unsigned int)slab->objects), 1);
 
 			if (policy == ALLOCATE_ANY)
 				return alloc;
diff --git a/mm/slab.h b/mm/slab.h
index f5e336b6b6b0..01535e1e2d3c 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -330,12 +330,6 @@ static inline unsigned int obj_to_index(const struct kmem_cache *cache,
 	return __obj_to_index(cache, slab_address(slab), obj);
 }
 
-static inline int objs_per_slab(const struct kmem_cache *cache,
-				const struct slab *slab)
-{
-	return slab->objects;
-}
-
 /*
  * State of the slab allocator.
  *
diff --git a/mm/slub.c b/mm/slub.c
index a4be70d080fb..9e25f2dce7a6 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2127,7 +2127,6 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
 			gfp_t gfp, unsigned int alloc_flags)
 {
 	const bool allow_spin = alloc_flags_allow_spinning(alloc_flags);
-	unsigned int objects = objs_per_slab(s, slab);
 	bool new_slab = alloc_flags & SLAB_ALLOC_NEW_SLAB;
 	unsigned long new_exts;
 	unsigned long old_exts;
@@ -2183,7 +2182,7 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
 #endif
 retry:
 	old_exts = READ_ONCE(slab->obj_exts);
-	handle_failed_objexts_alloc(old_exts, vec, objects);
+	handle_failed_objexts_alloc(old_exts, vec, slab->objects);
 
 	if (new_slab) {
 		/*

-- 
2.55.0