Re: [PATCH] compat: add compat functions for *at syscalls

[Andi Kleen]

On Tuesday 07 February 2006 01:01, David S. Miller wrote:
> From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxx>
> 
> 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
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