linux-kernel - Re: [norov:bitmap-tmp 7/8] arch/powerpc/xmon/xmon.c:472:64: error: expected ')' before 'return'

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Date:   Thu, 25 Nov 2021 18:54:27 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: [norov:bitmap-tmp 7/8] arch/powerpc/xmon/xmon.c:472:64: error:
 expected ')' before 'return'

On Thu, Nov 25, 2021 at 11:43:48AM -0800, Joe Perches wrote:
> On Fri, 2021-11-26 at 03:17 +0800, kernel test robot wrote:
> > tree:   https://github.com/norov/linux bitmap-tmp
> > head:   75ee333c81c999b29a49810611fb160cec32217d
> > commit: 29f49f10b3fbef5a88db0a7e370984297616f0fa [7/8] lib/cpumask: replace cpumask_weight with cpumask_{empty,gt,le,eq}
> > config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20211126/202111260340.kCOW9xsR-lkp@intel.com/config)
> > compiler: powerpc-linux-gcc (GCC) 11.2.0
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # https://github.com/norov/linux/commit/29f49f10b3fbef5a88db0a7e370984297616f0fa
> >         git remote add norov https://github.com/norov/linux
> >         git fetch --no-tags norov bitmap-tmp
> >         git checkout 29f49f10b3fbef5a88db0a7e370984297616f0fa
> >         # save the config file to linux build tree
> >         mkdir build_dir
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    arch/powerpc/xmon/xmon.c: In function 'wait_for_other_cpus':
> > > > arch/powerpc/xmon/xmon.c:472:64: error: expected ')' before 'return'
> >      472 |                 if (cpumask_weight_gt(&cpus_in_xmon, ncpus - 1)
> >          |                    ~                                           ^
> >          |                                                                )
> >      473 |                         return true;
> >          |                         ~~~~~~                                  
> > > > arch/powerpc/xmon/xmon.c:476:9: error: expected expression before '}' token
> >      476 |         }
> >          |         ^
> 
> It's always good to compile test patches before submitting them and:

As you can check, I didn't submit this patch. I pushed a series to my github,
and Intel 0-day bot tested it, and apparently found missed ')'.

I love this service, thank you Intel.
  
> > vim +472 arch/powerpc/xmon/xmon.c
> > 
> >    465	
> >    466	static bool wait_for_other_cpus(int ncpus)
> >    467	{
> >    468		unsigned long timeout;
> >    469	
> >    470		/* We wait for 2s, which is a metric "little while" */
> >    471		for (timeout = 20000; timeout != 0; --timeout) {
> >  > 472			if (cpumask_weight_gt(&cpus_in_xmon, ncpus - 1)
> >    473				return true;
> >    474			udelay(100);
> 
> unrelated trivia:
> 
> It seeems this loop could consume a lot of cpu/power.
> 
> Could this use usleep_range() or maybe something else that doesn't allow
> rescheduling on another cpu?
> 
> Maybe it should be something like
> 
> 	unsigned long timeout = jiffies + msecs_to_jiffies(2000);
> 
> 	while (time_before(jiffies, timeout)) {
> 		if (cpumask_weight_gt(&cpus_in_xmon, ncpus - 1)
> 				return true;
> 		usleep_range(100, 200);
> 	}
>