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    Subject[-mm patch] mutex.h bogus __must_check (was Re: 2.6.21-mm1)
    On Sat, May 05, 2007 at 01:49:55AM -0700, Andrew Morton wrote:
    >
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm1/
    >
    __must_check was added to mutex_lock_nested() which returns void. This
    causes the following warnings:
    include/linux/mutex.h:128: warning: 'warn_unused_result' attribute ignored

    This was introduced by
    broken-out/mutex_lock_interruptible-add-__must_check.patch

    Regards,
    Frederik

    Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>

    diff --git a/include/linux/mutex.h b/include/linux/mutex.h
    index 616500e..85e4225 100644
    --- a/include/linux/mutex.h
    +++ b/include/linux/mutex.h
    @@ -124,8 +124,8 @@ extern void fastcall mutex_lock(struct mutex *lock);
    extern int fastcall mutex_lock_interruptible(struct mutex *lock);

    #ifdef CONFIG_DEBUG_LOCK_ALLOC
    -extern void __must_check mutex_lock_nested(struct mutex *lock,
    - unsigned int subclass);
    +extern void mutex_lock_nested(struct mutex *lock,
    + unsigned int subclass);
    extern int __must_check mutex_lock_interruptible_nested(struct mutex *lock,
    unsigned int subclass);
    #else
    -
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