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] [day] [month] [year] [list]
Date:	Thu, 20 Dec 2012 17:45:50 -0500
From:	Rik van Riel <>
To:	Mel Gorman <>
CC:	Andrew Morton <>,,
Subject: Re: [PATCH] mm: compaction: Do not accidentally skip pageblocks in
 the migrate scanner

On 12/20/2012 09:22 AM, Mel Gorman wrote:
> Compaction uses the ALIGN macro incorrectly with the migrate scanner by
> adding pageblock_nr_pages to a PFN. It happened to work when initially
> implemented as the starting PFN was also aligned but with caching restarts
> and isolating in smaller chunks this is no longer always true. The impact is
> that the migrate scanner scans outside its current pageblock. As pfn_valid()
> is still checked properly it does not cause any failure and the impact
> of the bug is that in some cases it will scan more than necessary when
> it crosses a page boundary but by no more than COMPACT_CLUSTER_MAX. It
> is highly unlikely this is even measurable but it's still wrong so this
> patch addresses the problem.
> Signed-off-by: Mel Gorman <>

Reviewed-by: Rik van Riel <>

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists