On Thu, Sep 03, 2020 at 03:01:22PM +0800, Alex Shi wrote: > Armv6, sh2, sparc32 and xtensa can not do cmpxchg1, so we have to use > cmpxchg4 on it. > > Here we mark above 4 arch's NO_CMPXCHG_BYTE, and would add more if we > found. > > This is the first usages of cmpxchg flase sharing change. We'd better > check more cmpxchg usages in current kernel... I think a positive symbol, e.g. HAVE_CMPXCHG_BYTE is a lot easier to understand, and also fool-proof.
