linux-kernel - Re: [PATCH v3 0/3] Convert vmcore to use an iov

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Message-ID: <20220127094456.GD13508@MiWiFi-R3L-srv>
Date:   Thu, 27 Jan 2022 17:44:56 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        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>,
        Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] Convert vmcore to use an iov_iter

Hi,

On 01/01/22 at 12:36am, Al Viro wrote:
> On Mon, Dec 13, 2021 at 02:39:24PM +0000, Matthew Wilcox (Oracle) wrote:
> > For some reason several people have been sending bad patches to fix
> > compiler warnings in vmcore recently.  Here's how it should be done.
> > Compile-tested only on x86.  As noted in the first patch, s390 should
> > take this conversion a bit further, but I'm not inclined to do that
> > work myself.
> 
> A couple of notes: please, use iov_iter_count(i) instead of open-coding
> i->count.  And there's a preexisting nastiness in read_vmcore() -
> generally, a fault halfway through the read() is treated as a short read,
> rather than -EFAULT...

Willy must be busy with those tons of folio patches, since I have acked
this patchset, I will update them as per your comment and repost them
with v4.

Thanks for checking.