From: Jens Axboe <axboe@kernel.dk>
To: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org, stable@vger.kernel.org,
Mark Ray <mark.ray@hpe.com>, Greg KH <gregkh@linuxfoundation.org>
Subject: Re: [PATCH] blk-mq: remove blk_mq_hw_sysfs_cpus
Date: Fri, 16 Aug 2019 08:20:42 -0600 [thread overview]
Message-ID: <5baa0c28-6e12-5a61-0254-de0e49cf1596@kernel.dk> (raw)
In-Reply-To: <20190816074849.7197-1-ming.lei@redhat.com>
On 8/16/19 1:48 AM, Ming Lei wrote:
> It is reported that sysfs buffer overflow can be triggered in case
> of too many CPU cores(>841 on 4K PAGE_SIZE) when showing CPUs in
> blk_mq_hw_sysfs_cpus_show().
>
> This info isn't useful, given users may retrieve the CPU list
> from sw queue entries under same kobject dir, so far not see
> any active users.
>
> So remove the entry as suggested by Greg.
I think that's a bit frivolous, there could very well be scripts or
apps that use it. Let's just fix the overflow.
--
Jens Axboe
next prev parent reply other threads:[~2019-08-16 14:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 7:48 [PATCH] blk-mq: remove blk_mq_hw_sysfs_cpus Ming Lei
2019-08-16 8:12 ` Greg KH
2019-08-16 14:20 ` Jens Axboe [this message]
2019-08-16 14:54 ` Greg KH
2019-08-16 15:12 ` Jens Axboe
2019-08-16 15:21 ` Greg KH
2019-08-16 16:08 ` Ming Lei
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