linux-kernel - Re: [PATCH] iov_iter: separate direction from flavour

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Message-ID: <CAHk-=wj_AROgVZQ1=8mmYCXyu9JujGbNbxp+emGr5i3FagDayw@mail.gmail.com>
Date:   Sun, 4 Jul 2021 12:04:29 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Sterba <dsterba@...e.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Anton Altaparmakov <anton@...era.com>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [PATCH] iov_iter: separate direction from flavour

On Sun, Jul 4, 2021 at 11:54 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> No, I still see the same warning, with the same traceback. I did make sure
> that the code is executed by adding a printk in front of it.

And that printk() hits before the WARN_ON_ONCE() hits?

Funky. That sounds to me like something is then doing
set_fs(KERNEL_DS) again later, but it's also possible that I've been
dropped on my head a few too many times as a young child, and am
missing something completely obvious.

Can somebody put me out of my misery and say "Oh, Linus, please take
your meds - you're missing xyz..."

                 Linus