From: Guenter Roeck <li...@roeck-us.net> Date: Sun, 24 Sep 2017 10:29:31 -0700
> Fix the following build error, seen when building sparc32:allmodconfig. > > drivers/net/ethernet/intel/i40e/i40e_ethtool.c: > In function 'i40e_set_priv_flags': > drivers/net/ethernet/intel/i40e/i40e_ethtool.c:4150:2: error: > implicit declaration of function 'cmpxchg64' > > Signed-off-by: Guenter Roeck <li...@roeck-us.net> That fixes the build: > @@ -72,5 +72,6 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned > long new_, int size) > ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ > (unsigned long)(n), sizeof(*(ptr)))) > #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) > +#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n)) > > #endif /* __ARCH_SPARC_CMPXCHG__ */ but it's wrong. cmpxchg64_local() is only atomic on the current cpu so using it for plain cmpxchg64() is not going to work.
