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authorVineet Gupta <Vineet.Gupta1@synopsys.com>2016-11-07 16:31:40 -0800
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-11-13 13:44:35 +0100
commitb985fa069187e4c5a7ee84213d9fbead2f219ce5 (patch)
tree1b34d11506b950e6e99978053bc458545773a321 /libc/sysdeps/linux/lm32
parent17ea4f9622a80cc8717beeefe1371ccbcd501fe3 (diff)
NPTL/ARC: provide a kernel assisted atomic cmpxchg
For hardware configurations lacking LLOCK/SCOND (say ARC750), use a syscall to atomically do the cmpxchg. This is costly and painful, but really the only way out. Note that kenrel only guarantees this to work in a UP configuraion Reported-by: Avinash Patil <avinashp@quantenna.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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