Benjamin LaHaise wrote:
On Wed, Feb 22, 2006 at 04:43:47PM -0800, David S. Miller wrote:
Aha, that part I didn't catch. Thanks for the clarification
Ben.
I wonder why we did things that way with a fixed shift...
Without that trick, we'd have needed an extra parameter for the syscall
on x86, which is already at the maximum number of registers with 6
arguments. This was easier than changing the syscall ABI. =-)
Well, there is always the trick of making it a pointer. It was needed
for pselect() anyway. A real sys_mmap64 would definitely have been
cleaner, and will be needed to deal with the 16 TB barrier anyway :)
I personally think the S390 people had the right idea... once you run
out of registers, just make it a defined part of the ABI that we pass in
a single pointer to all the arguments.
-hpa
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