linux-kernel - Re: [PATCH] mm/vmalloc: reduce half comparison during pcpu_get_vm

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]

Message-ID: <20170807151102.GE4050379@devbig577.frc2.facebook.com>
Date:   Mon, 7 Aug 2017 08:11:02 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     akpm@...ux-foundation.org, mhocko@...e.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmalloc: reduce half comparison during
 pcpu_get_vm_areas()

On Thu, Aug 03, 2017 at 02:38:22PM +0800, Wei Yang wrote:
> In pcpu_get_vm_areas(), it checks each range is not overlapped. To make
> sure it is, only (N^2)/2 comparison is necessary, while current code does
> N^2 times. By starting from the next range, it achieves the goal and the
> continue could be removed.
> 
> At the mean time, other two work in this patch:
> *  the overlap check of two ranges could be done with one clause
> *  one typo in comment is fixed.
> 
> Signed-off-by: Wei Yang <richard.weiyang@...il.com>

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

Thanks.

-- 
tejun