linux-kernel - Re: [PATCH v3 5/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR

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Message-ID: <20200723203046.GI32057@gate.crashing.org>
Date:   Thu, 23 Jul 2020 15:30:46 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     peterz@...radead.org
Cc:     Waiman Long <longman@...hat.com>, linux-arch@...r.kernel.org,
        Boqun Feng <boqun.feng@...il.com>,
        virtualization@...ts.linux-foundation.org,
        linuxppc-dev@...ts.ozlabs.org, Nicholas Piggin <npiggin@...il.com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        kvm-ppc@...r.kernel.org, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v3 5/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR

On Thu, Jul 23, 2020 at 09:58:55PM +0200, peterz@...radead.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