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Date: Wed, 27 Sep 2017 21:55:50 -0700 From: Guenter Roeck <linux@...ck-us.net> To: David Miller <davem@...emloft.net> Cc: sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] sparc: Provide cmpxchg64 for 32-bit builds On 09/27/2017 09:38 PM, David Miller wrote: > From: Guenter Roeck <linux@...ck-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 <linux@...ck-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. > Yeah, I was concerned about that. My bad. Unfortunately I don't know enough about sparc to provide a better solution. Consider this a problem report, then. Guenter
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