linux-ext4 - Re: [PATCH 1/7] dax: Fix condition for filling of PMD holes

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]

Date:	Thu, 12 May 2016 13:03:04 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-nvdimm@...ts.01.org, Ted Tso <tytso@....edu>,
	linux-ext4@...r.kernel.org,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/7] dax: Fix condition for filling of PMD holes

On Thu, May 12, 2016 at 06:29:14PM +0200, Jan Kara wrote:
> Currently dax_pmd_fault() decides to fill a PMD-sized hole only if
> returned buffer has BH_Uptodate set. However that doesn't get set for
> any mapping buffer so that branch is actually a dead code. The
> BH_Uptodate check doesn't make any sense so just remove it.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>

With the note that when we reenable PMD faults we need to either test this
huge zero page path or just get rid of it and fall back to 4k zero pages.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html