linux-kernel - Re: next build: 235 warnings 3 failures (next/next-20151117)

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Message-ID: <6370082.rfihnaNWhf@wuerfel>
Date:	Tue, 17 Nov 2015 18:03:40 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Will Deacon <will.deacon@....com>
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 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);
}

	Arnd
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