path: root/include/asm-generic
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authorJoshua Kinard <kumba@gentoo.org>2012-06-24 21:01:34 -0400
committerRalf Baechle <ralf@linux-mips.org>2012-10-11 11:02:36 +0200
commitb4f2a17ba96a79f1069a2c0f1c648cf6d497f2f3 (patch)
tree75f44d8efb4748d9639869dc7089533b0964b037 /include/asm-generic
parent12250d843e8489ee00b5b7726da855e51694e792 (diff)
Improve atomic.h robustness
I've maintained this patch, originally from Thiemo Seufer in 2004, for a really long time, but I think it's time for it to get a look at for possible inclusion. I have had no problems with it across various SGI systems over the years. To quote the post here: http://www.linux-mips.org/archives/linux-mips/2004-12/msg00000.html "the atomic functions use so far memory references for the inline assembler to access the semaphore. This can lead to additional instructions in the ll/sc loop, because newer compilers don't expand the memory reference any more but leave it to the assembler. The appended patch uses registers instead, and makes the ll/sc arguments more explicit. In some cases it will lead also to better register scheduling because the register isn't bound to an output any more." Signed-off-by: Joshua Kinard <kumba@gentoo.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/4029/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include/asm-generic')
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