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Date: Tue, 17 Nov 2015 17:12:37 +0000 From: Will Deacon <will.deacon@....com> To: Arnd Bergmann <arnd@...db.de> Cc: Catalin Marinas <catalin.marinas@....com>, kernel-build-reports@...ts.linaro.org, olof@...om.net, David Miller <davem@...emloft.net>, eric.dumazet@...il.com, netdev@...r.kernel.org, linux-next@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: next build: 235 warnings 3 failures (next/next-20151117) On Tue, Nov 17, 2015 at 06:03:40PM +0100, Arnd Bergmann wrote: > On Tuesday 17 November 2015 16:44:53 Will Deacon wrote: > > > 8<---- > > > Subject: ARM64: make smp_load_acquire() work with const arguments > > > > > > smp_load_acquire() uses typeof() to declare a local variable for temporarily > > > storing the output of the memory access. This fails when the argument is > > > constant, because the assembler complains about using a constant register > > > as output: > > > > > > arch/arm64/include/asm/barrier.h:71:3: error: read-only variable '___p1' > > > used as 'asm' output > > > > Do you know the usage in the kernel causing this warning? > > A newly introduced function in include/net/sock.h: > > static inline int sk_state_load(const struct sock *sk) > { > return smp_load_acquire(&sk->sk_state); > } Hmm, maybe we could play a similar trick to READ_ONCE by declaring an anonymous union and writing through the non-const member? Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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