From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@davemloft.net>
Cc: sfr@canb.auug.org.au, akpm@osdl.org,
linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH] compat: add compat functions for *at syscalls
Date: Tue, 7 Feb 2006 10:25:39 +0100 [thread overview]
Message-ID: <200602071025.40130.ak@suse.de> (raw)
In-Reply-To: <20060206.160140.59716704.davem@davemloft.net>
On Tuesday 07 February 2006 01:01, David S. Miller wrote:
> From: Stephen Rothwell <sfr@canb.auug.org.au>
> Date: Tue, 7 Feb 2006 10:56:31 +1100
>
> > This adds compat version of all the remaining *at syscalls
> > so that the "dfd" arguments can be properly sign extended.
> >
> > Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
>
> I do the sign extension with tiny stubs in arch/sparc64/kernel/sys32.S
> so that the arg frobbing does not consume a stack frame, which is what
> happens if you do this in C code.
To be honest - do you really think that matters? Even a Niagara will
go through that in no time @)
And on x86-64 it should be as efficient as an equivalent assembly function.
-Andi
prev parent reply other threads:[~2006-02-07 9:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 23:56 [PATCH] compat: add compat functions for *at syscalls Stephen Rothwell
2006-02-07 0:01 ` David S. Miller
2006-02-07 0:27 ` Stephen Rothwell
2006-02-07 1:15 ` Linus Torvalds
2006-02-07 8:44 ` David S. Miller
2006-02-07 8:43 ` David S. Miller
2006-02-07 9:39 ` Andi Kleen
2006-02-07 10:56 ` David S. Miller
2006-02-07 6:40 ` Stephen Rothwell
2006-02-07 9:31 ` Heiko Carstens
2006-02-07 13:29 ` Heiko Carstens
2006-02-07 22:57 ` David S. Miller
2006-02-07 9:25 ` Andi Kleen [this message]
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