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    SubjectRe: um: WARNING: vmlinux: 'memcpy' exported twice. Previous export was in vmlinux
    On Thu, Mar 05, 2009 at 07:27:31PM +0200, Boaz Harrosh wrote:
    >Américo Wang wrote:
    >> On Thu, Mar 05, 2009 at 03:45:36PM +0200, Boaz Harrosh wrote:
    >>> Américo Wang wrote:
    >>>> On Thu, Mar 05, 2009 at 02:13:58PM +0200, Boaz Harrosh wrote:
    >>>>> On today's linus v2.6.29-rc7-3-g559595a
    >>>>>
    >>>>> Doing make ARCH=um defconfig & make ARCH=um
    >>>>> give's me:
    >>>>>
    >>>>> LD vmlinux.o
    >>>>> MODPOST vmlinux.o
    >>>>> WARNING: vmlinux: 'memcpy' exported twice. Previous export was in vmlinux
    >>>>>
    >>>>>
    >>>>> Sorry if this is a duplicate report
    >>>>>
    >>>> Weird...
    >>>> I tried to compile like what you said, I can't reproduce it.
    >>>>
    >>>> Which gcc are you using?
    >>>>
    >>>> Thanks.
    >>>>
    >>> $ gcc --version
    >>> gcc (GCC) 4.3.2 20081105 (Red Hat 4.3.2-7)
    >>>
    >>> I'm running on an x86_64 Fedora10 system (updated recently)
    >>> $ uname -o -s -r -m -p -i
    >>> Linux 2.6.27.15-170.2.24.fc10.x86_64 x86_64 x86_64 x86_64 GNU/Linux
    >>>
    >>
    >> I am using the same thing, but on i386. I still can't reproduce it. :(
    >>
    >
    >What can I say I just did it again from scratch
    >
    >$ mkdir .build_um
    >$ make ARCH=um KBUILD_OUTPUT=.build_um defconfig
    >$ make ARCH=um KBUILD_OUTPUT=.build_um
    >
    >(I'm using KBUILD_OUTPUT= because O= does not work when also using M= with
    > external modules, so it's a habit)
    >
    >Thanks for your help. I will try to bisect it on Sunday

    Hi, Boaz.

    I am sorry that I don't have an x86_64 machine to use, but I know
    why this happens now. :)

    Would you like to try the following patch? Thanks!

    -------------->

    Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>

    ---
    diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
    index 74f49bb..89b48a1 100644
    --- a/arch/um/os-Linux/user_syms.c
    +++ b/arch/um/os-Linux/user_syms.c
    @@ -14,7 +14,6 @@
    #undef memset

    extern size_t strlen(const char *);
    -extern void *memcpy(void *, const void *, size_t);
    extern void *memmove(void *, const void *, size_t);
    extern void *memset(void *, int, size_t);
    extern int printf(const char *, ...);
    @@ -24,7 +23,11 @@ extern int printf(const char *, ...);
    EXPORT_SYMBOL(strstr);
    #endif

    +#ifndef __x86_64__
    +extern void *memcpy(void *, const void *, size_t);
    EXPORT_SYMBOL(memcpy);
    +#endif
    +
    EXPORT_SYMBOL(memmove);
    EXPORT_SYMBOL(memset);
    EXPORT_SYMBOL(printf);
    --
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