Re: [PATCH] powerpc: cputime: fix a compile warning

[Pan Xinhui <xinhui@linux.vnet.ibm.com>]

在 2016/12/2 12:35, yjin 写道:
>
> On 2016年12月02日 12:22, Balbir Singh wrote:
>> On Fri, Dec 2, 2016 at 3:15 PM, Michael Ellerman <mpe@ellerman.id.au> wrote:
>>> yanjiang.jin@windriver.com writes:
>>>
>>>> diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h
>>>> index 4f60db0..4423e97 100644
>>>> --- a/arch/powerpc/include/asm/cputime.h
>>>> +++ b/arch/powerpc/include/asm/cputime.h
>>>> @@ -228,7 +228,8 @@ static inline cputime_t clock_t_to_cputime(const unsigned long clk)
>>>>        return (__force cputime_t) ct;
>>>>   }
>>>>
>>>> -#define cputime64_to_clock_t(ct)     cputime_to_clock_t((cputime_t)(ct))
>>>> +#define cputime64_to_clock_t(ct)     \
>>>> +     (__force u64)(cputime_to_clock_t((cputime_t)(ct)))
>>> Given the name of the function is "cputime64 to clock_t", surely we
>>> should be returning a clock_t ?
>> Please fix it in cpuacct.c  Also check out git commit
>> 527b0a76f41d062381adbb55c8eb61e32cb0bfc9
>> sched/cpuacct: Avoid %lld seq_printf warning
>
> Hi Balbir,
>
> Where can I find this commit?
>
hello,
	it is in next tree. :)

commit 527b0a76f41d062381adbb55c8eb61e32cb0bfc9
Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date:   Fri Nov 11 15:27:49 2016 +0100

     sched/cpuacct: Avoid %lld seq_printf warning
     
     For s390 kernel builds I keep getting this warning:
     
      kernel/sched/cpuacct.c: In function 'cpuacct_stats_show':
      kernel/sched/cpuacct.c:298:25: warning: format '%lld' expects argument of type 'long long int', but argument 4 has type 'clock_t {aka long int}' [-Wformat=]
        seq_printf(sf, "%s %lld\n",
     
     Silence the warning by adding an explicit cast.
     
     Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
     Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
     Cc: Linus Torvalds <torvalds@linux-foundation.org>
     Cc: Peter Zijlstra <peterz@infradead.org>
     Cc: Thomas Gleixner <tglx@linutronix.de>
     Link: http://lkml.kernel.org/r/20161111142749.6545-1-schwidefsky@de.ibm.com
     Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index bc0b309c..9add206 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -297,7 +297,7 @@ static int cpuacct_stats_show(struct seq_file *sf, void *v)
         for (stat = 0; stat < CPUACCT_STAT_NSTATS; stat++) {
                 seq_printf(sf, "%s %lld\n",
                            cpuacct_stat_desc[stat],
-                          cputime64_to_clock_t(val[stat]));
+                          (long long)cputime64_to_clock_t(val[stat]));
         }
  
         return 0;

> Thanks!
> Yanjiang
>>
>> Balbir
>