linux-kernel - Re: kernel/sched/core.c:5370:37: warning: cast between incompatible function types from 'long int (*)(void)' to 'int (*)(void)'

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Message-ID: <YGQlhQ9rfkKBwUKB@hirez.programming.kicks-ass.net>
Date:   Wed, 31 Mar 2021 09:32:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: kernel/sched/core.c:5370:37: warning: cast between incompatible
 function types from 'long int (*)(void)' to 'int (*)(void)'

On Wed, Mar 31, 2021 at 02:15:41PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   5e46d1b78a03d52306f21f77a4e4a144b6d31486
> commit: 826bfeb37bb4302ee6042f330c4c0c757152bdb8 preempt/dynamic: Support dynamic preempt with preempt= boot option
> date:   6 weeks ago
> config: x86_64-randconfig-r011-20210331 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=826bfeb37bb4302ee6042f330c4c0c757152bdb8
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 826bfeb37bb4302ee6042f330c4c0c757152bdb8
>         # save the attached .config to linux build tree
>         make W=1 ARCH=x86_64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    kernel/sched/core.c: In function 'schedule_tail':
>    kernel/sched/core.c:4252:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable]
>     4252 |  struct rq *rq;
>          |             ^~
>    In file included from include/linux/err.h:5,
>                     from include/linux/kthread.h:5,
>                     from include/trace/events/sched.h:8,
>                     from kernel/sched/core.c:10:
>    kernel/sched/core.c: In function 'setup_preempt_mode':
> >> kernel/sched/core.c:5370:37: warning: cast between incompatible function types from 'long int (*)(void)' to 'int (*)(void)' [-Wcast-function-type]

That warning is broken IMO.

Still, I have a patch for this somewhere.. I'll try and push it out
sometime soon.