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    Subject[PATCH 1/2] Adjust the comment on get_order() to describe the size==0 case
    Date
    Adjust the comment on get_order() to note that the result of passing a size of
    0 results in an undefined value.

    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Arnd Bergmann <arnd@arndb.de>
    ---

    include/asm-generic/getorder.h | 23 ++++++++++++++++++++++-
    1 files changed, 22 insertions(+), 1 deletions(-)

    diff --git a/include/asm-generic/getorder.h b/include/asm-generic/getorder.h
    index 67e7245..76e9687 100644
    --- a/include/asm-generic/getorder.h
    +++ b/include/asm-generic/getorder.h
    @@ -5,7 +5,28 @@

    #include <linux/compiler.h>

    -/* Pure 2^n version of get_order */
    +/**
    + * get_order - Determine the allocation order of a memory size
    + * @size: The size for which to get the order
    + *
    + * Determine the allocation order of a particular sized block of memory. This
    + * is on a logarithmic scale, where:
    + *
    + * 0 -> 2^0 * PAGE_SIZE and below
    + * 1 -> 2^1 * PAGE_SIZE to 2^0 * PAGE_SIZE + 1
    + * 2 -> 2^2 * PAGE_SIZE to 2^1 * PAGE_SIZE + 1
    + * 3 -> 2^3 * PAGE_SIZE to 2^2 * PAGE_SIZE + 1
    + * 4 -> 2^4 * PAGE_SIZE to 2^3 * PAGE_SIZE + 1
    + * ...
    + *
    + * The order returned is used to find the smallest allocation granule required
    + * to hold an object of the specified size.
    + *
    + * The result is undefined if the size is 0.
    + *
    + * This function may be used to initialise variables with compile time
    + * evaluations of constants.
    + */
    static inline __attribute_const__ int get_order(unsigned long size)
    {
    int order;


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