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    Subject[PATCH -rc7][resend] kthread: Silence bogus section mismatch warning

    WARNING: kernel/built-in.o(.text+0x16910): Section mismatch:
    reference to .init.text: (between 'kthreadd' and 'init_waitqueue_head')

    comes because kernel/kthread.c:kthreadd() is not __init but calls
    kthreadd_setup() which is __init. But this is ok, because kthreadd_setup()
    is only ever called at init time, and then kthreadd() proceeds into its
    "for (;;)" loop. We could mark kthreadd __init_refok, but kthreadd_setup()
    with just one callsite and 4 lines in it (it's been that small since
    10ab825bdef8df51) doesn't need to be a separate function at all -- so let's
    just move those four lines at beginning of kthreadd() itself.

    Signed-off-by: Satyam Sharma <>


    First discussed in,
    and I keep getting this with:

    |$ ld -V
    |GNU ld version 2.17
    | Supported emulations:
    | elf_i386
    | i386linux
    | elf_x86_64

    |$ gcc -v
    |Reading specs from /usr/lib/gcc/i386-pc-linux-gnu/3.4.4/specs
    |Configured with: /var/tmp/portage/gcc-3.4.4-r1/work/gcc-3.4.4/configure
    |--prefix=/usr --bindir=/usr/i386-pc-linux-gnu/gcc-bin/3.4.4
    |--host=i386-pc-linux-gnu --build=i386-pc-linux-gnu --disable-altivec
    |--enable-nls --without-included-gettext --with-system-zlib --disable-checking
    |--disable-werror --disable-libunwind-exceptions --disable-multilib
    |--disable-libgcj --enable-languages=c,c++,f77 --enable-shared
    |--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
    |Thread model: posix
    |gcc version 3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)

    kernel/kthread.c | 12 ++----------
    1 file changed, 2 insertions(+), 10 deletions(-)


    diff -ruNp a/kernel/kthread.c b/kernel/kthread.c
    --- a/kernel/kthread.c 2007-06-26 06:33:08.000000000 +0530
    +++ b/kernel/kthread.c 2007-06-27 02:57:46.000000000 +0530
    @@ -214,23 +214,15 @@ int kthread_stop(struct task_struct *k)

    -static __init void kthreadd_setup(void)
    +int kthreadd(void *unused)
    struct task_struct *tsk = current;

    + /* Setup a clean context for our children to inherit. */
    set_task_comm(tsk, "kthreadd");
    set_user_nice(tsk, -5);
    set_cpus_allowed(tsk, CPU_MASK_ALL);
    -int kthreadd(void *unused)
    - /* Setup a clean context for our children to inherit. */
    - kthreadd_setup();

    current->flags |= PF_NOFREEZE;

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      Last update: 2007-07-07 18:27    [W:0.025 / U:3.040 seconds]
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