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SubjectRe: [PATCH] powerpc: cputime: fix a compile warning
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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
>

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