linux-kernel - Re: [PATCH v5 06/14] cxl/region: Avoid duplicate call of cxl_port_pick_region

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250429163446.00006e8f@huawei.com>
Date: Tue, 29 Apr 2025 16:34:46 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Robert Richter <rrichter@....com>
CC: Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, Dave Jiang <dave.jiang@...el.com>, "Davidlohr
 Bueso" <dave@...olabs.net>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gregory Price <gourry@...rry.net>, "Fabio M.
 De Francesco" <fabio.m.de.francesco@...ux.intel.com>, Terry Bowman
	<terry.bowman@....com>
Subject: Re: [PATCH v5 06/14] cxl/region: Avoid duplicate call of
 cxl_port_pick_region_decoder()

On Mon, 28 Apr 2025 23:43:09 +0200
Robert Richter <rrichter@....com> wrote:

> Function cxl_port_pick_region_decoder() is called twice, in
> alloc_region_ref() and cxl_rr_alloc_decoder(). Both functions are
> subsequently called from cxl_port_attach_region(). Make the decoder a
> function argument to both which avoids a duplicate call of
> cxl_port_pick_region_decoder().
> 
> Now, cxl_rr_alloc_decoder() no longer allocates the decoder. Instead,
> the previously picked decoder is assigned to the region reference.
> Hence, rename the function to cxl_rr_assign_decoder().
> 
> Moving the call out of alloc_region_ref() also moves it out of the
> xa_for_each() loop in there. Now, cxld is determined no longer only
> for each auto-generated region, but now once for all regions
> regardless of auto-generated or not. This is fine as the cxld argument
> is needed for all regions in cxl_rr_assign_decoder() and an error would
> be returned otherwise anyway. So it is better to determine the decoder
> in front of all this and fail early if missing instead of running
> through all that code with multiple calls of
> cxl_port_pick_region_decoder().
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> Reviewed-by: Gregory Price <gourry@...rry.net>
> Tested-by: Gregory Price <gourry@...rry.net>

Subject to considering that name change

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>