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Message-ID: <AANLkTin7+-f662m=mbv_XiVxETx-5Q0PnSDhhM9GVYis@mail.gmail.com>
Date: Fri, 19 Nov 2010 15:16:38 +0800
From: Deng-Cheng Zhu <dengcheng.zhu@...il.com>
To: Will Deacon <will.deacon@....com>
Cc: ralf@...ux-mips.org, a.p.zijlstra@...llo.nl, fweisbec@...il.com,
linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
wuzhangjin@...il.com, paulus@...ba.org, mingo@...e.hu,
acme@...hat.com
Subject: Re: [PATCH 5/5] MIPS/Perf-events: Use unsigned delta for right shift
in event update
Thanks. The commit you pointed out was also in this patch set (#3).
But I think the return value should stick to 0, not 1. Something out of my
consideration?
Deng-Cheng
2010/11/18 Will Deacon <will.deacon@....com>:
> On Thu, 2010-11-18 at 06:56 +0000, Deng-Cheng Zhu wrote:
>> Leverage the commit for ARM by Will Deacon:
>>
>> 446a5a8b1eb91a6990e5c8fe29f14e7a95b69132
>> ARM: 6205/1: perf: ensure counter delta is treated as unsigned
>>
>> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@...il.com>
>> ---
>> arch/mips/kernel/perf_event.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c
>> index 345232a..0f1cdf5 100644
>> --- a/arch/mips/kernel/perf_event.c
>> +++ b/arch/mips/kernel/perf_event.c
>> @@ -169,7 +169,7 @@ static void mipspmu_event_update(struct perf_event *event,
>> unsigned long flags;
>> int shift = 64 - TOTAL_BITS;
>> s64 prev_raw_count, new_raw_count;
>> - s64 delta;
>> + u64 delta;
>>
>> again:
>> prev_raw_count = local64_read(&hwc->prev_count);
>> --
>> 1.7.1
>
> Acked-by: Will Deacon <will.deacon@....com>
>
> You might also want to look at commit 65b4711f if you based
> the MIPS port on the old ARM code.
>
> Thanks,
>
> Will
>
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