powerpc: Remove CONFIG_PPC601_SYNC_FIX

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@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/55b46bff16705b1ae7bf0a60ccd522b1010ebf75.1601362098.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index b4cc6608131cd4e7f705ca0d23e57d98cc0aec24..0b9dc814b81c49c507a653029267cc63b8146306 100644 (file)
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -382,15 +382,9 @@ n:
 #endif
 
 /* various errata or part fixups */
-#ifdef CONFIG_PPC601_SYNC_FIX
-#define SYNC           sync; isync
-#define SYNC_601       sync
-#define ISYNC_601      isync
-#else
 #define        SYNC
 #define SYNC_601
 #define ISYNC_601
-#endif
 
 #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 b439b027a42f127a0b6f8adcdf5969de9b6fa763..7a5e8f4541e3fd299d312ba899f7b0aaaa40903f 100644 (file)
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -199,21 +199,6 @@ source "drivers/cpuidle/Kconfig"
 
 endmenu
 
-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