linux-kernel - Re: [PATCH 05/14] uaccess: add generic __{get,put}_kernel

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Message-ID: <Ygr0eAA+ZR1eX0wb@zeniv-ca.linux.org.uk>
Date:   Tue, 15 Feb 2022 00:31:52 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
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Subject: Re: [PATCH 05/14] uaccess: add generic __{get,put}_kernel_nofault

On Mon, Feb 14, 2022 at 05:34:43PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> All architectures that don't provide __{get,put}_kernel_nofault() yet
> can implement this on top of __{get,put}_user.
> 
> Add a generic version that lets everything use the normal
> copy_{from,to}_kernel_nofault() code based on these, removing the last
> use of get_fs()/set_fs() from architecture-independent code.

I'd put the list of those architectures (AFAICS, that's alpha, ia64,
microblaze, nds32, nios2, openrisc, sh, sparc32, xtensa) into commit
message - it's not that hard to find out, but...

And AFAICS, you've missed nios2 - see
#define __put_user(x, ptr) put_user(x, ptr)
in there.  nds32 oddities are dealt with earlier in the series, this
one is not...