Commit e42a6400 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

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: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/55b46bff16705b1ae7bf0a60ccd522b1010ebf75.1601362098.git.christophe.leroy@csgroup.eu
parent ca1d3443

arch/powerpc/include/asm/ppc_asm.h

+0 −6
Original line number Diff line number Diff line
@@ -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)			\

arch/powerpc/platforms/Kconfig

+0 −15
Original line number Diff line number Diff line
@@ -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

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