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Re: [PATCH 5/5] MIPS/Perf-events: Use unsigned delta for right shift in

To: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Subject: Re: [PATCH 5/5] MIPS/Perf-events: Use unsigned delta for right shift in event update
From: Will Deacon <will.deacon@arm.com>
Date: Thu, 18 Nov 2010 09:27:38 +0000
Cc: ralf@linux-mips.org, a.p.zijlstra@chello.nl, fweisbec@gmail.com, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, wuzhangjin@gmail.com, paulus@samba.org, mingo@elte.hu, acme@redhat.com
In-reply-to: <1290063401-25440-6-git-send-email-dengcheng.zhu@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1290063401-25440-1-git-send-email-dengcheng.zhu@gmail.com> <1290063401-25440-6-git-send-email-dengcheng.zhu@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
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@gmail.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@arm.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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