linux-kernel - Re: [PATCH 1/2] percpu: allow pcpu_alloc() to be called with IRQs off

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: <4AE6EDBF.7040905@kernel.org>
Date:	Tue, 27 Oct 2009 13:55:27 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Jeff Mahoney <jeffm@...e.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: [PATCH 1/2] percpu: allow pcpu_alloc() to be called with IRQs
 off

Jiri Kosina wrote:
> pcpu_alloc() and pcpu_extend_area_map() perform a series of
> spin_lock_irq()/spin_unlock_irq() calls, which make them unsafe
> with respect to being called from contexts which have IRQs off.
> 
> This patch converts the code to perform save/restore of flags instead,
> making pcpu_alloc() (or __alloc_percpu() respectively) to be called
> from early kernel startup stage, where IRQs are off.
> 
> This is needed for proper initialization of per-cpu rq_weight data from
> sched_init().
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

Acked-by: Tejun Heo <tj@...nel.org>

I'll wait for response on the series and push it through percpu#fixes
tomorrow if there's no objection.

Thanks.

-- 
tejun
--
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/