linux-kernel - Re: [PATCH 14/33] locking/atomic: arc: move to ARCH

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Date:   Mon, 10 May 2021 15:57:59 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     linux-kernel@...r.kernel.org, will@...nel.org,
        boqun.feng@...il.com, peterz@...radead.org
Cc:     aou@...s.berkeley.edu, arnd@...db.de, bcain@...eaurora.org,
        benh@...nel.crashing.org, chris@...kel.net, dalias@...c.org,
        davem@...emloft.net, deanbo422@...il.com, deller@....de,
        geert@...ux-m68k.org, green.hu@...il.com, guoren@...nel.org,
        ink@...assic.park.msu.ru, James.Bottomley@...senPartnership.com,
        jcmvbkbc@...il.com, jonas@...thpole.se, ley.foon.tan@...el.com,
        linux@...linux.org.uk, mattst88@...il.com, monstr@...str.eu,
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        paulus@...ba.org, paul.walmsley@...ive.com, rth@...ddle.net,
        shorne@...il.com, stefan.kristiansson@...nalahti.fi,
        tsbogend@...ha.franken.de, vgupta@...opsys.com,
        ysato@...rs.sourceforge.jp
Subject: Re: [PATCH 14/33] locking/atomic: arc: move to ARCH_ATOMIC

On Mon, May 10, 2021 at 10:37:34AM +0100, Mark Rutland wrote:
> We'd like all architectures to convert to ARCH_ATOMIC, as once all
> architectures are converted it will be possible to make significant
> cleanups to the atomics headers, and this will make it much easier to
> generically enable atomic functionality (e.g. debug logic in the
> instrumented wrappers).
> 
> As a step towards that, this patch migrates arc to ARCH_ATOMIC. The arch
> code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common code
> wraps these with optional instrumentation to provide the regular
> functions.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Cc: Will Deacon <will@...nel.org>
> ---
>  arch/arc/Kconfig               |  1 +
>  arch/arc/include/asm/atomic.h  | 56 +++++++++++++++++++++---------------------
>  arch/arc/include/asm/cmpxchg.h |  8 +++---
>  3 files changed, 33 insertions(+), 32 deletions(-)

I evidently missed atomic_xchg() in asm/cmpxchg.h, so the fixup below is
needed. I've pushed that to my branch on kernel.org for now.

Mark.

---->8----
diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
index 87666980b78a..d1781bdf6527 100644
--- a/arch/arc/include/asm/cmpxchg.h
+++ b/arch/arc/include/asm/cmpxchg.h
@@ -153,6 +153,6 @@ static inline unsigned long __xchg(unsigned long val, volatile void *ptr,
  *         can't be clobbered by others. Thus no serialization required when
  *         atomic_xchg is involved.
  */
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+#define arch_atomic_xchg(v, new) (arch_xchg(&((v)->counter), new))
 
 #endif