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    Subject[PATCH 4/5] staging: zsmalloc: change ZS_MIN_ALLOC_SIZE
    Date
    This patch ensures that the value of ZS_MIN_ALLOC_SIZE, for the
    PAGE_SIZE and MAX_PHYSMEM_BITS on the system, allows for all
    possible object ids in the lowest storage class to be encoded
    in the object handle.

    Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
    ---
    drivers/staging/zsmalloc/zsmalloc_int.h | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/drivers/staging/zsmalloc/zsmalloc_int.h b/drivers/staging/zsmalloc/zsmalloc_int.h
    index ffb272f..92eefc6 100644
    --- a/drivers/staging/zsmalloc/zsmalloc_int.h
    +++ b/drivers/staging/zsmalloc/zsmalloc_int.h
    @@ -58,8 +58,10 @@
    #define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS)
    #define OBJ_INDEX_MASK ((_AC(1, UL) << OBJ_INDEX_BITS) - 1)

    +#define MAX(a, b) ((a) >= (b) ? (a) : (b))
    /* ZS_MIN_ALLOC_SIZE must be multiple of ZS_ALIGN */
    -#define ZS_MIN_ALLOC_SIZE 32
    +#define ZS_MIN_ALLOC_SIZE \
    + MAX(32, (ZS_MAX_PAGES_PER_ZSPAGE << PAGE_SHIFT >> OBJ_INDEX_BITS))
    #define ZS_MAX_ALLOC_SIZE PAGE_SIZE

    /*
    --
    1.7.5.4


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