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    Subject[PATCH 3/4] mm: vmalloc: add VM_DMA flag to indicate areas used by dma-mapping framework
    Add new type of vm_area intented to be used for consisten mappings
    created by dma-mapping framework.

    Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
    ---
    include/linux/vmalloc.h | 1 +
    mm/vmalloc.c | 3 +++
    2 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
    index 6071e91..8a9555a 100644
    --- a/include/linux/vmalloc.h
    +++ b/include/linux/vmalloc.h
    @@ -14,6 +14,7 @@ struct vm_area_struct; /* vma defining user mapping in mm_types.h */
    #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
    #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
    #define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
    +#define VM_DMA 0x00000040 /* used by dma-mapping framework */
    /* bits [20..32] reserved for arch specific ioremap internals */

    /*
    diff --git a/mm/vmalloc.c b/mm/vmalloc.c
    index 8cb7f22..9c13bab 100644
    --- a/mm/vmalloc.c
    +++ b/mm/vmalloc.c
    @@ -2582,6 +2582,9 @@ static int s_show(struct seq_file *m, void *p)
    if (v->flags & VM_IOREMAP)
    seq_printf(m, " ioremap");

    + if (v->flags & VM_DMA)
    + seq_printf(m, " dma");
    +
    if (v->flags & VM_ALLOC)
    seq_printf(m, " vmalloc");

    --
    1.7.1.569.g6f426


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