linux-kernel - Re: [RFC v2 PATCH] mm/percpu.c: fix panic triggered by BUG

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] [day] [month] [year] [list]

Date:   Thu, 13 Oct 2016 20:24:41 -0400
From:   Tejun Heo <tj@...nel.org>
To:     zijun_hu <zijun_hu@...o.com>
Cc:     zijun_hu@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, cl@...ux.com
Subject: Re: [RFC v2 PATCH] mm/percpu.c: fix panic triggered by BUG_ON()
 falsely

Hello,

On Fri, Oct 14, 2016 at 08:06:10AM +0800, zijun_hu wrote:
> > I really can't decode what the actual issue is here.  Can you please
> > give an example of a concrete case?
> > 
> the right relationship between the number of CPUs @nr_cpus within a percpu group
> and the number of unites @nr_units within the same group is that
> @nr_units == roundup(@nr_cpus, @upa);

My question was whether there can be actual hardware configurations
where this code can fail and if so what they look like and how they
would fail.

Thanks.

-- 
tejun