[RFC -tip 0/4] x86: reduce fixup of uaccess

Hiroshi Shimamoto
2009-01-06T03:06:46Z

This is my second try to reduce fixup code size for exceptions of uaccess.

This patch series reduces fixup code for exceptions of uaccess in signal.

I gave up to make direct jump to end of function when an exception occurs.
However, I thought fixup code could be reduced. The concept is that to add
uaccess_err in thread_info and set it to -EFAULT on exception, finally check
this value on the last of function.

Is this good to reduce code size?

The code size reductions are below;
$ size *signal*.o.*
text data bss dec hex filename
4741 0 0 4741 1285 ia32_signal.o.new
6006 0 0 6006 1776 ia32_signal.o.old
3577 0 0 3577 df9 signal.o.new
4540 0 0 4540 11bc signal.o.old
3855 0 0 3855 f0f signal32.o.new
4876 0 0 4876 130c signal32.o.old

Thanks,
Hiroshi