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    Subject[tip:x86/extable] extable: Skip sorting if sorted at build time.
    Commit-ID:  d219e2e86a407035303b987e4184ca0b1de53257
    Gitweb: http://git.kernel.org/tip/d219e2e86a407035303b987e4184ca0b1de53257
    Author: David Daney <david.daney@cavium.com>
    AuthorDate: Thu, 19 Apr 2012 14:59:56 -0700
    Committer: H. Peter Anvin <hpa@linux.intel.com>
    CommitDate: Thu, 19 Apr 2012 15:06:55 -0700

    extable: Skip sorting if sorted at build time.

    If the build program sortextable has already sorted the exception
    table, don't sort it again.

    Signed-off-by: David Daney <david.daney@cavium.com>
    Link: http://lkml.kernel.org/r/1334872799-14589-3-git-send-email-ddaney.cavm@gmail.com
    Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
    ---
    kernel/extable.c | 8 +++++++-
    1 files changed, 7 insertions(+), 1 deletions(-)

    diff --git a/kernel/extable.c b/kernel/extable.c
    index 5339705..fe35a63 100644
    --- a/kernel/extable.c
    +++ b/kernel/extable.c
    @@ -35,10 +35,16 @@ DEFINE_MUTEX(text_mutex);
    extern struct exception_table_entry __start___ex_table[];
    extern struct exception_table_entry __stop___ex_table[];

    +/* Cleared by build time tools if the table is already sorted. */
    +u32 __initdata main_extable_sort_needed = 1;
    +
    /* Sort the kernel's built-in exception table */
    void __init sort_main_extable(void)
    {
    - sort_extable(__start___ex_table, __stop___ex_table);
    + if (main_extable_sort_needed)
    + sort_extable(__start___ex_table, __stop___ex_table);
    + else
    + pr_notice("__ex_table already sorted, skipping sort\n");
    }

    /* Given an address, look for it in the exception tables. */

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