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

[David S. Miller]

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.

We need to revisit this at some point and make a way for all
compat platforms to do this with a portable table of some kind
that expands a bunch of macros defined by the platform.
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