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Add a test in check_slab_flags for this. Fixes: ad67f5a6545f ("arm64: replace ZONE_DMA with ZONE_DMA32") Signed-off-by: Nicolas Boichat --- 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(-) diff --git a/include/linux/slab.h b/include/linux/slab.h index 918f374e7156f4..afc51ee1dae5d4 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -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 */ diff --git a/mm/internal.h b/mm/internal.h index 7a500b232e4a43..2aa9c8491d2ca2 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -14,6 +14,7 @@ #include #include #include +#include #include /* @@ -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; diff --git a/mm/slab.c b/mm/slab.c index 251e09a5a3ef5c..6efcaad6a02b70 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -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); diff --git a/mm/slab.h b/mm/slab.h index 58c6c1c2a78ee3..9632772e14beb2 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -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) diff --git a/mm/slab_common.c b/mm/slab_common.c index 7eb8dc136c1cb8..f204385553bbac 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -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. diff --git a/mm/slub.c b/mm/slub.c index 1cca562bebdc8d..c639bd008e8c11 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -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)