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    SubjectRe: "eliminate warn_on_slowpath()" change causes many gcc-3.2.3 warnings

    * Mikael Pettersson <> wrote:

    > Commit ec5679e513305f1411753e5f5489935bd638af23 "eliminate warn_on_slowpath()"
    > changed __WARN() to call warn_slowpath() with a NULL value for the format
    > string parameter. Now every WARN_ON() triggers a warning from gcc-3.2.3:
    > In file included from include/linux/kmod.h:22,
    > from include/linux/module.h:13,
    > from include/linux/crypto.h:21,
    > from arch/x86/kernel/asm-offsets_32.c:7,
    > from arch/x86/kernel/asm-offsets.c:2:
    > include/linux/gfp.h: In function `allocflags_to_migratetype':
    > include/linux/gfp.h:104: warning: null format string
    > Compiling kernel 2.6.29-rc2 with a minimalistic .config for my 486
    > generates 1767 'null format string' warnings.
    > warn_slowpath() is declared with attribute((format(printf, 3, 4))),
    > and gcc-3.2.3 warns if the format string parameter is NULL. gcc-3.3
    > and newer do not warn in that case.
    > Since gcc-3.2 is still a supported compiler for the kernel, this is
    > a regression.
    > (Just FYI. I don't consider this serious enough to warrant reverting
    > that cleanup patch or declaring gcc-3.2.3 too old. I can always update
    > my 486 to gcc-3.3.6 if the warnings start to bug me too much.)

    hm, that's unfortunate. GCC seems totally on crack for not accepting a
    NULL format string.


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