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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
>
> --
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.
>
> -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/