From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Tue, 5 Aug 2025 17:22:55 +0000 (+0100)
Subject: slab: use memdesc_flags_t
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=40476ba5d7b1b5cca2ba9c3e6b64568261d91db7;p=users%2Fjedix%2Flinux-maple.git

slab: use memdesc_flags_t

The slab flags are memdesc flags and contain the same information in the
upper bits as the other memdescs (like node ID).

Link: https://lkml.kernel.org/r/20250805172307.1302730-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/slab.h b/mm/slab.h
index 248b34c839b7..7757331e7c80 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -50,7 +50,7 @@ typedef union {
 
 /* Reuses the bits in struct page */
 struct slab {
-	unsigned long flags;
+	memdesc_flags_t flags;
 
 	struct kmem_cache *slab_cache;
 	union {
diff --git a/mm/slub.c b/mm/slub.c
index 8dbeabc6a0f0..af343ca570b5 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -657,17 +657,17 @@ static inline unsigned int slub_get_cpu_partial(struct kmem_cache *s)
  */
 static inline bool slab_test_pfmemalloc(const struct slab *slab)
 {
-	return test_bit(SL_pfmemalloc, &slab->flags);
+	return test_bit(SL_pfmemalloc, &slab->flags.f);
 }
 
 static inline void slab_set_pfmemalloc(struct slab *slab)
 {
-	set_bit(SL_pfmemalloc, &slab->flags);
+	set_bit(SL_pfmemalloc, &slab->flags.f);
 }
 
 static inline void __slab_clear_pfmemalloc(struct slab *slab)
 {
-	__clear_bit(SL_pfmemalloc, &slab->flags);
+	__clear_bit(SL_pfmemalloc, &slab->flags.f);
 }
 
 /*
@@ -675,12 +675,12 @@ static inline void __slab_clear_pfmemalloc(struct slab *slab)
  */
 static __always_inline void slab_lock(struct slab *slab)
 {
-	bit_spin_lock(SL_locked, &slab->flags);
+	bit_spin_lock(SL_locked, &slab->flags.f);
 }
 
 static __always_inline void slab_unlock(struct slab *slab)
 {
-	bit_spin_unlock(SL_locked, &slab->flags);
+	bit_spin_unlock(SL_locked, &slab->flags.f);
 }
 
 static inline bool
@@ -1046,7 +1046,7 @@ static void print_slab_info(const struct slab *slab)
 {
 	pr_err("Slab 0x%p objects=%u used=%u fp=0x%p flags=%pGp\n",
 	       slab, slab->objects, slab->inuse, slab->freelist,
-	       &slab->flags);
+	       &slab->flags.f);
 }
 
 void skip_orig_size_check(struct kmem_cache *s, const void *object)
@@ -2755,17 +2755,17 @@ static void discard_slab(struct kmem_cache *s, struct slab *slab)
 
 static inline bool slab_test_node_partial(const struct slab *slab)
 {
-	return test_bit(SL_partial, &slab->flags);
+	return test_bit(SL_partial, &slab->flags.f);
 }
 
 static inline void slab_set_node_partial(struct slab *slab)
 {
-	set_bit(SL_partial, &slab->flags);
+	set_bit(SL_partial, &slab->flags.f);
 }
 
 static inline void slab_clear_node_partial(struct slab *slab)
 {
-	clear_bit(SL_partial, &slab->flags);
+	clear_bit(SL_partial, &slab->flags.f);
 }
 
 /*