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c119a8a3c3
xchg() for a single-byte location assembles to a 4-byte Compare&Swap, wrapped into a non-trivial amount of retry code that deals with concurrent modifications to the unaffected bytes. Change it to a simple byte-store, but preserve the memory ordering semantics that the CS provided. This simplifies the generated code for a hot path, and in theory also allows us to amortize the memory barriers over multiple SLSB updates. CC: Andreas Krebbel <krebbel@linux.ibm.com> Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Makefile |