From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 01/10] pktcdvd: remove the call to
	blk_queue_bounce
Date: Mon, 19 Jun 2017 17:00:22 +0200
Message-ID: <20170619150022.GA10165@lst.de>
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To: Ming Lei <tom.leiming@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>, linux-block <linux-block@vger.kernel.org>, "open list:DEVICE-MAPPER (LVM)" <dm-devel@redhat.com>, Christoph Hellwig <hch@lst.de>
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On Mon, Jun 19, 2017 at 10:34:36PM +0800, Ming Lei wrote:
> blk_queue_make_request() sets bounce for any highmem page for long time,
> and in theory this patch might cause regression on 32bit arch, when
> the controller can't handle higmem page really(especially in case of PAE), so
> we may need to be careful about this change, especially on some old hardware.

Which controller?

From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <hch@lst.de>
Date: Mon, 19 Jun 2017 17:00:22 +0200
From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	linux-block <linux-block@vger.kernel.org>,
	"open list:DEVICE-MAPPER (LVM)" <dm-devel@redhat.com>
Subject: Re: [PATCH 01/10] pktcdvd: remove the call to blk_queue_bounce
Message-ID: <20170619150022.GA10165@lst.de>
References: <20170619072628.12894-1-hch@lst.de> <20170619072628.12894-2-hch@lst.de> <CACVXFVMxgKk1kzL=rgAzdw8X5qgWn8Z_Hv-gUHSKfp1rXRArxA@mail.gmail.com>
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On Mon, Jun 19, 2017 at 10:34:36PM +0800, Ming Lei wrote:
> blk_queue_make_request() sets bounce for any highmem page for long time,
> and in theory this patch might cause regression on 32bit arch, when
> the controller can't handle higmem page really(especially in case of PAE), so
> we may need to be careful about this change, especially on some old hardware.

Which controller?