linux-kernel - Re: [PATCH 13/17] RISC-V: Add include subdirectory

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Date:   Wed, 7 Jun 2017 14:18:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, olof@...om.net,
        albert@...ive.com, patches@...ups.riscv.org
Subject: Re: [PATCH 13/17] RISC-V: Add include subdirectory

On Wed, Jun 07, 2017 at 02:06:13PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 06, 2017 at 04:00:03PM -0700, Palmer Dabbelt wrote:

> > +static inline int atomic_fetch_sub(unsigned int mask, atomic_t *v)
> > +{
> > +	int out;
> > +
> > +	__asm__ __volatile__ (
> > +		"amosub.w %2, %1, %0"
> > +		: "+A" (v->counter), "=r" (out)
> > +		: "r" (mask));
> > +	return out;
> > +}

Your instruction manual does not list AMOSUB as a valid instruction. So
either it is wrong or this code never compiled. Please clarify.