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Subject[PATCH] mm/slab: kmalloc with GFP_DMA32 allocate from SLAB_CACHE_DMA32
Date
The flag GFP_DMA32 only effect in kmalloc_large currently.

This patch will create caches with GFP_DMA32 to support kmalloc with
size under KMALLOC_MAX_CACHE_SIZE.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
include/linux/slab.h | 7 +++++++
mm/slab_common.c | 14 ++++++++++++++
2 files changed, 21 insertions(+)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index be4ba5867ac5..f4317663d148 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -307,6 +307,9 @@ enum kmalloc_cache_type {
KMALLOC_RECLAIM,
#ifdef CONFIG_ZONE_DMA
KMALLOC_DMA,
+#endif
+#ifdef CONFIG_ZONE_DMA32
+ KMALLOC_DMA32,
#endif
NR_KMALLOC_TYPES
};
@@ -331,6 +334,10 @@ static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags)
*/
return flags & __GFP_DMA ? KMALLOC_DMA : KMALLOC_RECLAIM;
#else
+#ifdef CONFIG_ZONE_DMA32
+ if (unlikely(flags & __GFP_DMA32))
+ return KMALLOC_DMA32;
+#endif
return flags & __GFP_RECLAIMABLE ? KMALLOC_RECLAIM : KMALLOC_NORMAL;
#endif
}
diff --git a/mm/slab_common.c b/mm/slab_common.c
index e981c80d216c..2a04736fe8f5 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -805,6 +805,20 @@ void __init create_kmalloc_caches(slab_flags_t flags)
}
}
#endif
+#ifdef CONFIG_ZONE_DMA32
+ for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) {
+ struct kmem_cache *s = kmalloc_caches[KMALLOC_NORMAL][i];
+
+ if (s) {
+ unsigned int size = kmalloc_size(i);
+ const char *n = kmalloc_cache_name("dma32-kmalloc", size);
+
+ BUG_ON(!n);
+ kmalloc_caches[KMALLOC_DMA32][i] = create_kmalloc_cache(
+ n, size, SLAB_CACHE_DMA32 | flags, 0, 0);
+ }
+ }
+#endif
}
#endif /* !CONFIG_SLOB */

--
2.25.1


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