tree 7941bcdc08cce96bbd31b718a23d1c9431dde2b1
parent 4fb11781a044552dded5342e1a78cf92a74683db
author Helge Deller <deller@gmx.de> 1241127585 +0000
committer Kyle McMartin <kyle@mcmartin.ca> 1246592047 +0000

parisc: fix ldcw inline assembler

There are two reasons to expose the memory *a in the asm:

1) To prevent the compiler from discarding a preceeding write to *a, and
2) to prevent it from caching *a in a register over the asm.

The change has had a few days testing with a SMP build of 2.6.22.19
running on a rp3440.

This patch is about the correctness of the __ldcw() macro itself.
The use of the macro should be confined to small inline functions
to try to limit the effect of clobbering memory on GCC's optimization
of loads and stores.

Signed-off-by: Dave Anglin <dave.anglin@nrc-cnrc.gc.ca>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>