linux-kernel - Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20090102185524.GB6856@localdomain>
Date:	Fri, 2 Jan 2009 10:55:24 -0800
From:	Ravikiran G Thirumalai <kiran@...lex86.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, travis@....com, stable@...nel.org,
	shai@...lex86.org
Subject: Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu_pda

On Fri, Jan 02, 2009 at 05:09:51PM +0100, Ingo Molnar wrote:
>
>* Ravikiran G Thirumalai <kiran@...lex86.org> wrote:
>
>> The pda rework (commit 3461b0af025251bbc6b3d56c821c6ac2de6f7209)
>> to remove static boot cpu pdas introduced a bug.  _boot_cpu_pda is the
>> actual pda used by the boot cpu and is definitely not "__read_mostly" and
>> ended up polluting the read mostly section with writes.  This bug caused
>> regression of about 8-10% on certain syscall intensive workloads.
>> 
>> Signed-off-by: Ravikiran Thirumalai <kiran@...lex86.org>
>
>applied to tip/x86/urgent, with a Cc: stable tag. Thanks,
>

Thanks!

Stable maintainers, please consider this for 2.6.27 stable as well
(in addition to 28).  (Attaching the tip/x86/urgent commit as reference to
the patch)

Thanks,
Kiran

View attachment "fix_incorrect_readmostly" of type "text/plain" (1119 bytes)