linux-kernel - Re: [PATCH v2] compat: fs: Generic compat_sys

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Date:	Wed, 19 Sep 2012 11:13:26 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2] compat: fs: Generic compat_sys_sendfile implementation

On Wednesday 19 September 2012, Catalin Marinas wrote:
> 
> This function is used by sparc, powerpc and arm64 for compat support.
> The patch adds a generic implementation which calls do_sendfile()
> directly and avoids set_fs().
> 
> The sparc architecture has wrappers for the sign extensions while
> powerpc relies on the compiler to do the this. The patch adds wrappers
> for powerpc to handle the u32->int type conversion.
> 
> compat_sys_sendfile64() can be replaced by a sys_sendfile() call since
> compat_loff_t has the same size as off_t on a 64-bit system.
> 
> On powerpc, the patch also changes the 64-bit sendfile call from
> sys_sendile64 to sys_sendfile.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: David S. Miller <davem@...emloft.net>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Andrew Morton <akpm@...ux-foundation.org>

Acked-by: Arnd Bergmann <arnd@...db.de>
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