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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