linux-kernel - Re: [PATCH v5 1/9] lib/group_cpus: let group_cpu

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Message-ID: <06ae6360-f252-47e9-b705-43270edee582@suse.de>
Date: Mon, 13 Jan 2025 08:07:55 +0100
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <wagi@...nel.org>, Jens Axboe <axboe@...nel.dk>,
 Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>, "Michael S. Tsirkin" <mst@...hat.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
 Thomas Gleixner <tglx@...utronix.de>, Costa Shulyupin
 <costa.shul@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
 Valentin Schneider <vschneid@...hat.com>, Waiman Long <llong@...hat.com>,
 Ming Lei <ming.lei@...hat.com>, Frederic Weisbecker <frederic@...nel.org>,
 Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
 linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
 megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
 storagedev@...rochip.com, virtualization@...ts.linux.dev,
 GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH v5 1/9] lib/group_cpus: let group_cpu_evenly return number
 initialized masks

On 1/10/25 17:26, Daniel Wagner wrote:
> group_cpu_evenly might allocated less groups then the requested:
> 
> group_cpu_evenly
>    __group_cpus_evenly
>      alloc_nodes_groups
>        # allocated total groups may be less than numgrps when
>        # active total CPU number is less then numgrps
> 
> In this case, the caller will do an out of bound access because the
> caller assumes the masks returned has numgrps.
> 
> Return the number of groups created so the caller can limit the access
> range accordingly.
> 
> Signed-off-by: Daniel Wagner <wagi@...nel.org>
> ---
>   block/blk-mq-cpumap.c        |  6 +++---
>   drivers/virtio/virtio_vdpa.c |  9 +++++----
>   fs/fuse/virtio_fs.c          |  6 +++---
>   include/linux/group_cpus.h   |  3 ++-
>   kernel/irq/affinity.c        |  9 +++++----
>   lib/group_cpus.c             | 12 +++++++++---
>   6 files changed, 27 insertions(+), 18 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich