From: Keith Busch <keith.busch@linux.intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Max Gurtovoy <maxg@mellanox.com>,
axboe@kernel.dk, linux-block@vger.kernel.org, sagi@grimberg.me,
martin.petersen@oracle.com, vladimirk@mellanox.com,
linux-nvme@lists.infradead.org, keith.busch@intel.com
Subject: Re: [PATCH v3 2/3] block: move dif_prepare/dif_complete functions to block layer
Date: Wed, 25 Jul 2018 08:53:57 -0600 [thread overview]
Message-ID: <20180725145357.GD14596@localhost.localdomain> (raw)
In-Reply-To: <20180725112247.GA24190@lst.de>
On Wed, Jul 25, 2018 at 01:22:47PM +0200, Christoph Hellwig wrote:
> > + pmap = kmap_atomic(iv.bv_page) + iv.bv_offset;
> > + p = pmap;
>
> Maybe:
>
> pmap = p = kmap_atomic(iv.bv_page) + iv.bv_offset;
Max pointed out that even with this, we're still calling kunmap_atomic()
with an address potentially at an offset from the page that was kmap'ed.
While currently harmless, perhaps for correctness:
pmap = kmap_atomic(iv.bv_page);
p = pmap + iv.bv_offset;
WARNING: multiple messages have this Message-ID (diff)
From: keith.busch@linux.intel.com (Keith Busch)
Subject: [PATCH v3 2/3] block: move dif_prepare/dif_complete functions to block layer
Date: Wed, 25 Jul 2018 08:53:57 -0600 [thread overview]
Message-ID: <20180725145357.GD14596@localhost.localdomain> (raw)
In-Reply-To: <20180725112247.GA24190@lst.de>
On Wed, Jul 25, 2018@01:22:47PM +0200, Christoph Hellwig wrote:
> > + pmap = kmap_atomic(iv.bv_page) + iv.bv_offset;
> > + p = pmap;
>
> Maybe:
>
> pmap = p = kmap_atomic(iv.bv_page) + iv.bv_offset;
Max pointed out that even with this, we're still calling kunmap_atomic()
with an address potentially at an offset from the page that was kmap'ed.
While currently harmless, perhaps for correctness:
pmap = kmap_atomic(iv.bv_page);
p = pmap + iv.bv_offset;
next prev parent reply other threads:[~2018-07-25 14:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-25 8:46 [PATCH v3 1/3] block: move ref_tag calculation func to the block layer Max Gurtovoy
2018-07-25 8:46 ` Max Gurtovoy
2018-07-25 8:47 ` [PATCH v3 2/3] block: move dif_prepare/dif_complete functions to " Max Gurtovoy
2018-07-25 8:47 ` Max Gurtovoy
2018-07-25 11:22 ` Christoph Hellwig
2018-07-25 11:22 ` Christoph Hellwig
2018-07-25 11:47 ` Max Gurtovoy
2018-07-25 11:47 ` Max Gurtovoy
2018-07-25 14:53 ` Keith Busch [this message]
2018-07-25 14:53 ` Keith Busch
2018-07-25 8:47 ` [PATCH v3 3/3] nvme: use blk API to remap ref tags for IOs with metadata Max Gurtovoy
2018-07-25 8:47 ` Max Gurtovoy
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