Re: [PATCH 2/2] x86: replace BIO_VMERGE_BOUNDARY withBIOVEC_PHYS_MERGEABLE

[FUJITA Tomonori]

On Fri, 24 Oct 2008 13:59:06 -0700
Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

> The bio common code no longer uses BIO_VMERGE_BOUNDARY, so replace it
> with BIOVEC_PHYS_MERGEABLE.  Also make iommu_bio_merge a boolean
> rather than a size, as befits its use.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>

This doesn't look correct.

The block layer always done the physical merge if possible. We don't
provide any kernel parameter to disable it.

The iommu_bio_merge parameter had been used to enable the virtual
merge. As I wrote, the virtual merge feature was completely
removed. Effectively, the iommu_bio_merge parameter is meaningless
now.
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