Re: [PATCH 02/10] block: simplify bio_add_page()

[Christoph Hellwig]

On Mon, Apr 27, 2015 at 11:48:29PM -0700, Ming Lin wrote:
> Note that removing call to ->merge_bvec_fn() is fine for
> bio_add_pc_page(), as SCSI devices usually don't even need that.
> Few exceptional cases like pscsi or osd are not affected either.

This explanation confuses me.  Based on my reading of the code I'd
replace it with something like:

Removing the call to ->merge_bvec_fn() is also fine, as no driver that
implements support for BLOCK_PC commands even has a ->merge_bvec_fn()
method.
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