From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-x236.google.com (mail-yk0-x236.google.com [IPv6:2607:f8b0:4002:c07::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4ED5A1A0001 for ; Sat, 7 Mar 2015 22:19:57 +1100 (AEDT) Received: by ykr79 with SMTP id 79so1707735ykr.13 for ; Sat, 07 Mar 2015 03:19:55 -0800 (PST) From: Kevin Hao To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc64: use fixed lock token for !CONFIG_PPC_SPLPAR Date: Sat, 7 Mar 2015 19:19:43 +0800 Message-Id: <1425727183-30880-1-git-send-email-haokexin@gmail.com> Cc: Scott Wood , Paul Mackerras List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , It makes no sense to use a variant lock token on a platform which doesn't support for shared-processor logical partitions. Actually we can eliminate a memory load by using a fixed lock token on these platforms. Signed-off-by: Kevin Hao --- arch/powerpc/include/asm/spinlock.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h index 4dbe072eecbe..d303cdad2519 100644 --- a/arch/powerpc/include/asm/spinlock.h +++ b/arch/powerpc/include/asm/spinlock.h @@ -30,7 +30,7 @@ #define smp_mb__after_unlock_lock() smp_mb() /* Full ordering for lock. */ -#ifdef CONFIG_PPC64 +#ifdef CONFIG_PPC_SPLPAR /* use 0x800000yy when locked, where yy == CPU number */ #ifdef __BIG_ENDIAN__ #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) @@ -187,9 +187,13 @@ extern void arch_spin_unlock_wait(arch_spinlock_t *lock); #ifdef CONFIG_PPC64 #define __DO_SIGN_EXTEND "extsw %0,%0\n" -#define WRLOCK_TOKEN LOCK_TOKEN /* it's negative */ #else #define __DO_SIGN_EXTEND +#endif + +#ifdef CONFIG_PPC_SPLPAR +#define WRLOCK_TOKEN LOCK_TOKEN /* it's negative */ +#else #define WRLOCK_TOKEN (-1) #endif -- 2.1.0