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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/8] powerpc: Remove SYNC on non 6xx
Date: Tue, 29 Sep 2020 06:48:31 +0000 (UTC)
Message-ID: <27951fa6c9a8f80724d1bc81a6117ac32343a55d.1601362098.git.christophe.leroy@csgroup.eu> (raw)

SYNC is usefull for Powerpc 601 only. On everything else,
SYNC is empty.

Remove it from code that is not made to run on 6xx.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/kernel/head_40x.S   | 1 -
 arch/powerpc/kernel/head_booke.h | 1 -
 arch/powerpc/kernel/misc_64.S    | 1 -
 3 files changed, 3 deletions(-)

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 5b282d9965a5..44c9018aed1b 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -72,7 +72,6 @@ turn_on_mmu:
 	lis	r0,start_here@h
 	ori	r0,r0,start_here@l
 	mtspr	SPRN_SRR0,r0
-	SYNC
 	rfi				/* enables MMU */
 	b	.			/* prevent prefetch past rfi */
 
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 18f87bf9e32b..71c359d438b5 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -176,7 +176,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
 #endif
 	mtspr	SPRN_SRR1,r10
 	mtspr	SPRN_SRR0,r11
-	SYNC
 	RFI				/* jump to handler, enable MMU */
 99:	b	ret_from_kernel_syscall
 .endm
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 7bb46ad98207..070465825c21 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -365,7 +365,6 @@ _GLOBAL(kexec_smp_wait)
 
 	li	r4,KEXEC_STATE_REAL_MODE
 	stb	r4,PACAKEXECSTATE(r13)
-	SYNC
 
 	b	kexec_wait
 
-- 
2.25.0


             reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-29  6:48 Christophe Leroy [this message]
2020-09-29  6:48 ` [PATCH v3 2/8] powerpc: Remove CONFIG_PPC601_SYNC_FIX Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 3/8] powerpc: Drop SYNC_601() ISYNC_601() and SYNC() Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 4/8] powerpc: Remove PowerPC 601 Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 5/8] powerpc: Remove support for " Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 6/8] powerpc: Tidy up a bit after removal of " Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 7/8] powerpc: Remove __USE_RTC() Christophe Leroy
2020-09-29  6:48 ` [PATCH v3 8/8] powerpc: Remove get_tb_or_rtc() Christophe Leroy
2020-10-09  6:04 ` [PATCH v3 1/8] powerpc: Remove SYNC on non 6xx Michael Ellerman

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