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    Subject[RFC PATCH 3/6] slab: add kmalloc_align()
    Date
    ALIGN_OF_LAST_BIT(sizes[INDEX_AC].cs_size) is used instead of
    ARCH_KMALLOC_MINALIGN when kmalloc kmem_caches are created.

    No behavior changed except debug.

    Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
    ---
    include/linux/slab_def.h | 6 ++++++
    mm/slab.c | 8 ++++----
    2 files changed, 10 insertions(+), 4 deletions(-)

    diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
    index fbd1117..fb0c8ab 100644
    --- a/include/linux/slab_def.h
    +++ b/include/linux/slab_def.h
    @@ -159,6 +159,12 @@ found:
    return __kmalloc(size, flags);
    }

    +static __always_inline
    +void *kmalloc_align(size_t size, gfp_t flags, size_t align)
    +{
    + return kmalloc(ALIGN(size, align), flags);
    +}
    +
    #ifdef CONFIG_NUMA
    extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
    extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
    diff --git a/mm/slab.c b/mm/slab.c
    index f0bd785..df8edbe 100644
    --- a/mm/slab.c
    +++ b/mm/slab.c
    @@ -1587,7 +1587,7 @@ void __init kmem_cache_init(void)

    sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name,
    sizes[INDEX_AC].cs_size,
    - ARCH_KMALLOC_MINALIGN,
    + ALIGN_OF_LAST_BIT(sizes[INDEX_AC].cs_size),
    ARCH_KMALLOC_FLAGS|SLAB_PANIC,
    NULL);

    @@ -1595,7 +1595,7 @@ void __init kmem_cache_init(void)
    sizes[INDEX_L3].cs_cachep =
    kmem_cache_create(names[INDEX_L3].name,
    sizes[INDEX_L3].cs_size,
    - ARCH_KMALLOC_MINALIGN,
    + ALIGN_OF_LAST_BIT(sizes[INDEX_L3].cs_size),
    ARCH_KMALLOC_FLAGS|SLAB_PANIC,
    NULL);
    }
    @@ -1613,7 +1613,7 @@ void __init kmem_cache_init(void)
    if (!sizes->cs_cachep) {
    sizes->cs_cachep = kmem_cache_create(names->name,
    sizes->cs_size,
    - ARCH_KMALLOC_MINALIGN,
    + ALIGN_OF_LAST_BIT(sizes->cs_size),
    ARCH_KMALLOC_FLAGS|SLAB_PANIC,
    NULL);
    }
    @@ -1621,7 +1621,7 @@ void __init kmem_cache_init(void)
    sizes->cs_dmacachep = kmem_cache_create(
    names->name_dma,
    sizes->cs_size,
    - ARCH_KMALLOC_MINALIGN,
    + ALIGN_OF_LAST_BIT(sizes->cs_size),
    ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
    SLAB_PANIC,
    NULL);
    --
    1.7.4.4


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