linux-kernel - Re: [PATCH v3 05/10] iov_iter: Create a function to prepare userspace VM for UBUF/IOVEC tests

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Message-ID: <3936726.1700066370@warthog.procyon.org.uk>
Date:   Wed, 15 Nov 2023 16:39:30 +0000
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Christian Brauner <christian@...uner.io>,
        Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>,
        David Laight <David.Laight@...lab.com>,
        Matthew Wilcox <willy@...radead.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        David Gow <davidgow@...gle.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Brauner <brauner@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, loongarch@...ts.linux.dev,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v3 05/10] iov_iter: Create a function to prepare userspace VM for UBUF/IOVEC tests

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> From a quick look, what you were doing was checking that the patterns
> you set up in user space came through ok. Dammit, what's wrong with
> just using read()/write() on a pipe, or splice, or whatever. It will
> test exactly the same iov_iter thing.

I was trying to make it possible to do these tests before starting userspace
as there's a good chance that if the UBUF/IOVEC iterators don't work right
then your system can't be booted.

Anyway, if I drop patches 5, 6, 7 and 10 (ie. the ones doing stuff with UBUF
and IOVEC-type iterators), would you be okay with the rest?

David