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

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Message-ID: <20170607163502.roefzqivvkywb236@hirez.programming.kicks-ass.net>
Date:   Wed, 7 Jun 2017 18:35:02 +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,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH 13/17] RISC-V: Add include subdirectory

On Wed, Jun 07, 2017 at 02:58:50PM +0200, Peter Zijlstra wrote:
> On Wed, Jun 07, 2017 at 02:36:27PM +0200, Peter Zijlstra wrote:
> > Which (pending the sub confusion) will generate the entire set of:
> > 
> >  atomic_add, atomic_add_return{_relaxed,_acquire,_release,} atomic_fetch_add{_relaxed,_acquire,_release,}
> >  atomic_sub, atomic_sub_return{_relaxed,_acquire,_release,} atomic_fetch_sub{_relaxed,_acquire,_release,}
> > 
> >  atomic_and, atomic_fetch_and{_relaxed,_acquire,_release,}
> >  atomic_or,  atomic_fetch_or{_relaxed,_acquire,_release,}
> >  atomic_xor, atomic_fetch_xor{_relaxed,_acquire,_release,}
> > 
> 
> Another approach would be to override __atomic_op_{acquire,release} and
> use things like:
> 
> 	"FENCE r,rw" -- (load) ACQUIRE
> 	"FENCE rw,w" -- (store) RELEASE
> 
> And then you only need to provide _relaxed atomics.
> 
> Also, and I didn't check for that, you need to provide:
> 
> smp_load_acquire(), smp_store_release(), atomic_read_acquire(),
> atomic_store_release().

Also, you probably need to provide smp_mb__before_spinlock(), but also
see:

  https://lkml.kernel.org/r/20170607161501.819948352@infradead.org