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From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
	Paul Mackerras <paulus@ozlabs.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: [PATCH 4/5] powerpc/64s: avoid branch for ppc_msgsnd
Date: Fri,  7 Apr 2017 22:56:01 +1000	[thread overview]
Message-ID: <20170407125602.31146-5-npiggin@gmail.com> (raw)
In-Reply-To: <20170407125602.31146-1-npiggin@gmail.com>

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/include/asm/dbell.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h
index 4db4cfdd829c..8ad66ccb7180 100644
--- a/arch/powerpc/include/asm/dbell.h
+++ b/arch/powerpc/include/asm/dbell.h
@@ -38,10 +38,8 @@ enum ppc_dbell {
 
 static inline void _ppc_msgsnd(u32 msg)
 {
-	if (cpu_has_feature(CPU_FTR_HVMODE))
-		__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
-	else
-		__asm__ __volatile__ (PPC_MSGSNDP(%0) : : "r" (msg));
+	__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
+				: : "i" (CPU_FTR_HVMODE), "r" (msg));
 }
 
 /* sync before sending message */
-- 
2.11.0

  parent reply	other threads:[~2017-04-07 12:56 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-07 12:55 [PATCH 0/5] doorbell patches for POWER9 Nicholas Piggin
2017-04-07 12:55 ` [PATCH 1/5] powerpc/pseries: do not use msgsndp doorbells on POWER9 guests Nicholas Piggin
2017-04-09  8:03   ` Benjamin Herrenschmidt
2017-04-10  3:22     ` Nicholas Piggin
2017-04-10  4:07       ` Benjamin Herrenschmidt
2017-04-10  4:28         ` Nicholas Piggin
2017-04-11 10:10   ` Michael Ellerman
2017-04-11 12:18     ` Nicholas Piggin
2017-04-07 12:55 ` [PATCH 2/5] powerpc: change the doorbell IPI calling convention Nicholas Piggin
2017-04-07 12:56 ` [PATCH 3/5] powerpc: Introduce msgsnd/doorbell barrier primitives Nicholas Piggin
2017-04-07 12:56 ` Nicholas Piggin [this message]
2017-04-07 12:56 ` [PATCH 5/5] powerpc/powernv: POWER9 support for msgsnd/doorbell IPI Nicholas Piggin

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