Re: [PATCH] lib/scatterlist: Fix to calculate the last_pg properly

[Andrew Morton]

On Mon, 9 Jan 2023 20:18:39 -0700 Jens Axboe <axboe@xxxxxxxxx> wrote:

> On 1/9/23 7:47 AM, Yishai Hadas wrote:
> > The last_pg is wrong, it is actually the first page of the last
> > scatterlist element. To get the last page of the last scatterlist
> > element we have to add prv->length. So it is checking mergability
> > against the wrong page, Further, a SG element is not guaranteed to end
> > on a page boundary, so we have to check the sub page location also for
> > merge eligibility.
> > 
> > Fix the above by checking physical contiguity, compute the actual last
> > page and then call pages_are_mergable().
> 
> Reviewed-by: Jens Axboe <axboe@xxxxxxxxx>
> 
> Andrew, can you pick this one up?

This patch is against Yishai's 

CommitDate: Thu Jan 5 16:01:05 2023 -0400

    lib/scatterlist: Fix to merge contiguous pages into the last SG properly
    

which is in -next, apparently via a tree of Jason's.  So I'll assume
that Jason will handleit?