From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>,
Doug Gilbert <dgilbert@interlog.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>,
linux-block@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: fix /dev/sg allocation failures register
Date: Wed, 15 Apr 2026 08:08:05 +0200 [thread overview]
Message-ID: <20260415060813.807659-1-hch@lst.de> (raw)
Hi all,
Shin'ichiro reported trivially triggerable allocation failures when
using SG_IO on the sg driver. This turn out to be caused by the
bio allocation rework, which makes non-blocking allocation fail
much easier.
This series has two independent patches to fix this from different
angles. The first one changes the completely pointless GFP_ATOMIC
to use GFP_ATOMIC in sg. The other drops the reduction of the gfp
mask in the bio allocator, so that atomic allocations of bios work
as expected, even if they are a pretty bad idea as the bio submission
actually needs a user context anyway. The only other uses of this
seems to be the ocfs2 cluster managed.
next reply other threads:[~2026-04-15 6:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-15 6:08 Christoph Hellwig [this message]
2026-04-15 6:08 ` [PATCH 1/2] sg: don't use GFP_ATOMIC in sg_start_req Christoph Hellwig
2026-04-15 8:02 ` John Garry
2026-04-16 6:25 ` Hannes Reinecke
2026-04-16 15:05 ` Bart Van Assche
2026-04-15 6:08 ` [PATCH 2/2] block: only restrict bio allocation gfp mask asked to block Christoph Hellwig
2026-04-16 6:26 ` Hannes Reinecke
2026-04-16 15:07 ` Bart Van Assche
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