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Date:   Thu, 23 Jul 2020 15:30:46 -0500
From:   Segher Boessenkool <segher@kernel.crashing.org>
To:     peterz@infradead.org
Cc:     Waiman Long <longman@redhat.com>, linux-arch@vger.kernel.org,
        Boqun Feng <boqun.feng@gmail.com>,
        virtualization@lists.linux-foundation.org,
        linuxppc-dev@lists.ozlabs.org, Nicholas Piggin <npiggin@gmail.com>,
        linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        kvm-ppc@vger.kernel.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v3 5/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR
Message-ID: <20200723203046.GI32057@gate.crashing.org>
References: <20200706043540.1563616-1-npiggin@gmail.com> <20200706043540.1563616-6-npiggin@gmail.com> <874kqhvu1v.fsf@mpe.ellerman.id.au> <8265d782-4e50-a9b2-a908-0cb588ffa09c@redhat.com> <20200723140011.GR5523@worktop.programming.kicks-ass.net> <845de183-56f5-2958-3159-faa131d46401@redhat.com> <20200723184759.GS119549@hirez.programming.kicks-ass.net> <6d6279ad-7432-63c1-14c3-18c4cff30bf8@redhat.com> <20200723195855.GU119549@hirez.programming.kicks-ass.net>
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On Thu, Jul 23, 2020 at 09:58:55PM +0200, peterz@infradead.org wrote:
> 	asm ("addb	%[val], %b[var];"
> 	     "cmovc	%[sat], %[var];"
> 	     : [var] "+r" (tmp)
> 	     : [val] "ir" (val), [sat] "r" (sat)
> 	     );

"var" (operand 0) needs an earlyclobber ("sat" is read after "var" is
written for the first time).


Segher