Re: [PATCH v3 0/3] preadv & pwritev syscalls.

From: Ralf Baechle <redacted>
Date: Mon, 15 Dec 2008 16:03:11 +0000

On Mon, Dec 15, 2008 at 12:36:14PM +0100, Gerd Hoffmann wrote:

quoted

Next revision of the patch series, with the alignment issue fixed by
swapping the last two arguments as suggested by arch maintainers.

I've dropped the now-obsolete wrappers for mips.  Ralf, please
double-check.

It fixes the alignment issue but still won't work; on MIPS 32-bit userspace
will pass the 64-bit argument in two registers but the 64-bit kernel code
will assume it to be passed in a single registers.

Same on 32-bit sparc, and I assume 32-bit powerpc as well.

I'm surprised this works for x86; does x86-64 code really expect 64-bit
arguments as 2 32-bit arguments?

Args get pushed onto the stack, so perhaps it works by accident :)