@@ -32,6 +32,8 @@
#define SLAB_HWCACHE_ALIGN ((slab_flags_t __force)0x00002000U)
/* Use GFP_DMA memory */
#define SLAB_CACHE_DMA ((slab_flags_t __force)0x00004000U)
+/* Use GFP_DMA32 memory */
+#define SLAB_CACHE_DMA32 ((slab_flags_t __force)0x00008000U)
/* DEBUG: Store the last owner for bug hunting */
#define SLAB_STORE_USER ((slab_flags_t __force)0x00010000U)
/* Panic if kmem_cache_create() fails */
@@ -14,6 +14,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
+#include <linux/slab.h>
#include <linux/tracepoint-defs.h>
/*
@@ -34,9 +35,12 @@
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
/* Check for flags that must not be used with a slab allocator */
-static inline gfp_t check_slab_flags(gfp_t flags)
+static inline gfp_t check_slab_flags(gfp_t flags, slab_flags_t slab_flags)
{
- gfp_t bug_mask = __GFP_DMA32 | __GFP_HIGHMEM | ~__GFP_BITS_MASK;
+ gfp_t bug_mask = __GFP_HIGHMEM | ~__GFP_BITS_MASK;
+
+ if (!IS_ENABLED(CONFIG_ZONE_DMA32) || !(slab_flags & SLAB_CACHE_DMA32))
+ bug_mask |= __GFP_DMA32;
if (unlikely(flags & bug_mask)) {
gfp_t invalid_mask = flags & bug_mask;
@@ -2122,6 +2122,8 @@ int __kmem_cache_create(struct kmem_cache *cachep, slab_flags_t flags)
cachep->allocflags = __GFP_COMP;
if (flags & SLAB_CACHE_DMA)
cachep->allocflags |= GFP_DMA;
+ if (flags & SLAB_CACHE_DMA32)
+ cachep->allocflags |= GFP_DMA32;
if (flags & SLAB_RECLAIM_ACCOUNT)
cachep->allocflags |= __GFP_RECLAIMABLE;
cachep->size = size;
@@ -2656,7 +2658,7 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep,
* Be lazy and only check for valid flags here, keeping it out of the
* critical path in kmem_cache_alloc().
*/
- flags = check_slab_flags(flags);
+ flags = check_slab_flags(flags, cachep->flags);
WARN_ON_ONCE(cachep->ctor && (flags & __GFP_ZERO));
local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
@@ -127,7 +127,8 @@ static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
/* Legal flag mask for kmem_cache_create(), for various configurations */
-#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
+#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
+ SLAB_CACHE_DMA32 | SLAB_PANIC | \
SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
#if defined(CONFIG_DEBUG_SLAB)
@@ -53,7 +53,7 @@ static DECLARE_WORK(slab_caches_to_rcu_destroy_work,
SLAB_FAILSLAB | SLAB_KASAN)
#define SLAB_MERGE_SAME (SLAB_RECLAIM_ACCOUNT | SLAB_CACHE_DMA | \
- SLAB_ACCOUNT)
+ SLAB_CACHE_DMA32 | SLAB_ACCOUNT)
/*
* Merge control. If this is set then no merging of slab caches will occur.
@@ -1681,7 +1681,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
{
- flags = check_slab_flags(flags);
+ flags = check_slab_flags(flags, s->flags);
return allocate_slab(s,
flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
@@ -3571,6 +3571,9 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
if (s->flags & SLAB_CACHE_DMA)
s->allocflags |= GFP_DMA;
+ if (s->flags & SLAB_CACHE_DMA32)
+ s->allocflags |= GFP_DMA32;
+
if (s->flags & SLAB_RECLAIM_ACCOUNT)
s->allocflags |= __GFP_RECLAIMABLE;
@@ -5090,6 +5093,14 @@ static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
SLAB_ATTR_RO(cache_dma);
#endif
+#ifdef CONFIG_ZONE_DMA32
+static ssize_t cache_dma32_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA32));
+}
+SLAB_ATTR_RO(cache_dma32);
+#endif
+
static ssize_t usersize_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%u\n", s->usersize);
@@ -5430,6 +5441,9 @@ static struct attribute *slab_attrs[] = {
#ifdef CONFIG_ZONE_DMA
&cache_dma_attr.attr,
#endif
+#ifdef CONFIG_ZONE_DMA32
+ &cache_dma32_attr.attr,
+#endif
#ifdef CONFIG_NUMA
&remote_node_defrag_ratio_attr.attr,
#endif
@@ -5660,6 +5674,8 @@ static char *create_unique_id(struct kmem_cache *s)
*/
if (s->flags & SLAB_CACHE_DMA)
*p++ = 'd';
+ if (s->flags & SLAB_CACHE_DMA32)
+ *p++ = 'D';
if (s->flags & SLAB_RECLAIM_ACCOUNT)
*p++ = 'a';
if (s->flags & SLAB_CONSISTENCY_CHECKS)
SLAB_CACHE_DMA32 is only available after explicit kmem_cache_create calls, no default cache is created for kmalloc. Add a test in check_slab_flags for this. Fixes: ad67f5a6545f ("arm64: replace ZONE_DMA with ZONE_DMA32") Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> --- include/linux/slab.h | 2 ++ mm/internal.h | 8 ++++++-- mm/slab.c | 4 +++- mm/slab.h | 3 ++- mm/slab_common.c | 2 +- mm/slub.c | 18 +++++++++++++++++- 6 files changed, 31 insertions(+), 6 deletions(-)