linux-kernel - Re: [PATCH] Convert filldir[64]() from __put_user() to unsafe_put

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Message-ID: <5f06c138-d59a-d811-c886-9e73ce51924c@roeck-us.net>
Date:   Sun, 6 Oct 2019 17:04:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] Convert filldir[64]() from __put_user() to
 unsafe_put_user()

On 10/6/19 4:35 PM, Linus Torvalds wrote:
[ ... ]

> Anyway, let me think about this, but just for testing, does the
> attached patch make any difference? It's not the right thing in
> general (and most definitely not on x86), but for testing whether this
> is about unaligned accesses it might work.
> 

All my alpha, sparc64, and xtensa tests pass with the attached patch
applied on top of v5.4-rc2. I didn't test any others.

I'll (try to) send you some disassembly next.

Guenter