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powerpc: Remove CONFIG_PPC601_SYNC_FIX

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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
This commit is contained in:
Christophe Leroy 2020-09-29 06:48:33 +00:00 committed by Michael Ellerman
parent ca1d3443b4
commit e42a64002a
2 changed files with 0 additions and 21 deletions
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6
arch/powerpc/include/asm/ppc_asm.h
View File

@ -382,15 +382,9 @@ GLUE(.,name):
#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) \

15
arch/powerpc/platforms/Kconfig
View File

@ -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