linux-kernel - Re: [PATCH 13/15] sparc: add renameat2 syscall

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Message-Id: <20140515.124931.1801842437410594819.davem@davemloft.net>
Date:	Thu, 15 May 2014 12:49:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	miklos@...redi.hu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/15] sparc: add renameat2 syscall

From: Miklos Szeredi <miklos@...redi.hu>
Date: Thu, 15 May 2014 14:22:33 +0200

> On Fri, Apr 11, 2014 at 12:25 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
>> From: Miklos Szeredi <mszeredi@...e.cz>
>>
>> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
>> Cc: David S. Miller <davem@...emloft.net>
> 
> David,
> 
> I'll be sending a batch of patches with arch support for the renameat2
> syscall to Linus next week.  If you'd like me to send this as well,
> could you please ACK it?

For the 32-bit compat case on sparc64, you need to add a wrapper to
sign extend the oldfd and newfd arguments.

This usually occurs in arch/sparc/kernel/sys32.S, probably something
like:

SIGN2(sys32_renameat2, sys_renameat2, %o0, %o2)

and then you hook up sys32_renameat2 instead of sys_renameat2 in the
32-bit compat syscall table in syscall_64.S
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