linux-kernel - Re: [PATCH 1/3] vmcore: Convert copy_oldmem_page() to take an iov

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Message-ID: <YbsGxJRo1153aykr@osiris>
Date:   Thu, 16 Dec 2021 10:28:36 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>, kexec@...ts.infradead.org,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        linux-kernel@...r.kernel.org,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Subject: Re: [PATCH 1/3] vmcore: Convert copy_oldmem_page() to take an
 iov_iter

On Mon, Dec 13, 2021 at 08:57:25AM +0100, Christoph Hellwig wrote:
> On Mon, Dec 13, 2021 at 12:06:34AM +0000, Matthew Wilcox (Oracle) wrote:
> > Instead of passing in a 'buf' and 'userbuf' argument, pass in an iov_iter.
> > s390 needs more work to pass the iov_iter down further, or refactor,
> > but I'd be more comfortable if someone who can test on s390 did that work.
> > 
> > It's more convenient to convert the whole of read_from_oldmem() to
> > take an iov_iter at the same time, so rename it to read_from_oldmem_iter()
> > and add a temporary read_from_oldmem() wrapper that creates an iov_iter.
> 
> This looks pretty reasonable.  s390 could use some love from people that
> know the code, and yes, the kerneldoc comments should go away.

Sure, we will take care of this. Added to ToDo list.