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    Subject[tip:x86/asmlinkage] Kbuild, lto: Handle basic LTO in modpost
    Commit-ID:  ef178f9238b142cc1020265e176b20d27fd02ba9
    Gitweb: http://git.kernel.org/tip/ef178f9238b142cc1020265e176b20d27fd02ba9
    Author: Andi Kleen <ak@linux.intel.com>
    AuthorDate: Sat, 8 Feb 2014 09:01:17 +0100
    Committer: H. Peter Anvin <hpa@linux.intel.com>
    CommitDate: Thu, 13 Feb 2014 20:25:05 -0800

    Kbuild, lto: Handle basic LTO in modpost

    - Don't warn about LTO marker symbols. modpost runs before
    the linker, so the module is not necessarily LTOed yet.
    - Don't complain about .gnu.lto* sections

    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    Link: http://lkml.kernel.org/r/1391846481-31491-13-git-send-email-ak@linux.intel.com
    Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
    ---
    scripts/mod/modpost.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
    index f91dd45..63804a1 100644
    --- a/scripts/mod/modpost.c
    +++ b/scripts/mod/modpost.c
    @@ -623,7 +623,10 @@ static void handle_modversions(struct module *mod, struct elf_info *info,

    switch (sym->st_shndx) {
    case SHN_COMMON:
    - warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
    + if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
    + /* Should warn here, but modpost runs before the linker */
    + } else
    + warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
    break;
    case SHN_UNDEF:
    /* undefined symbol */
    @@ -849,6 +852,7 @@ static const char *section_white_list[] =
    ".xt.lit", /* xtensa */
    ".arcextmap*", /* arc */
    ".gnu.linkonce.arcext*", /* arc : modules */
    + ".gnu.lto*",
    NULL
    };


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