[PATCH 3/9] powerpc: Remove CONFIG_PPC601_SYNC_FIX

From: Christophe Leroy
Date: Thu Aug 13 2020 - 12:36:45 EST

This config option isn't in any defconfig.

The very first versions of Powerpc 601 have a bug which
requires additional sync before and/or after some instructions.

This was more than 25 years ago and time has come to retire
those buggy versions of the 601 from the kernel.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
arch/powerpc/include/asm/ppc_asm.h | 6 ------
arch/powerpc/platforms/Kconfig | 15 ---------------
2 files changed, 21 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index b4cc6608131c..0b9dc814b81c 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -382,15 +382,9 @@ GLUE(.,name):

/* various errata or part fixups */
-#define SYNC sync; isync
-#define SYNC_601 sync
-#define ISYNC_601 isync
#define SYNC
#define SYNC_601
#define ISYNC_601

#if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_FSL_BOOK3E)
#define MFTB(dest) \
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index fb7515b4fa9c..f377a56ecc85 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -199,21 +199,6 @@ source "drivers/cpuidle/Kconfig"


-config PPC601_SYNC_FIX
- bool "Workarounds for PPC601 bugs"
- depends on PPC_BOOK3S_601 && PPC_PMAC
- default y
- help
- Some versions of the PPC601 (the first PowerPC chip) have bugs which
- mean that extra synchronization instructions are required near
- certain instructions, typically those that make major changes to the
- CPU state. These extra instructions reduce performance slightly.
- If you say N here, these extra instructions will not be included,
- resulting in a kernel which will run faster but may not run at all
- on some systems with the PPC601 chip.
- If in doubt, say Y here.
config TAU
bool "On-chip CPU temperature sensor support"
depends on PPC_BOOK3S_32