Commit 8149238f authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
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powerpc: Redefine HMT_xxx macros as empty on PPC32 



HMT_xxx macros are macros for adjusting thread priority
(hardware multi-threading) are macros inherited from PPC64
via commit 5f7c6907 ("[PATCH] powerpc: Merged ppc_asm.h")

Those instructions are pointless on PPC32, but some common
fonctions like arch_cpu_idle() use them.

So make them empty on PPC32 to avoid those instructions.

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/c5a07fadea33d640ad10cecf0ac8faaec1c524e0.1629898474.git.christophe.leroy@csgroup.eu
parent f50da6ed

arch/powerpc/include/asm/vdso/processor.h

+9 −0
Original line number Diff line number Diff line
@@ -5,12 +5,21 @@ 
#ifndef __ASSEMBLY__



/* Macros for adjusting thread priority (hardware multi-threading) */

#ifdef CONFIG_PPC64

#define HMT_very_low()		asm volatile("or 31, 31, 31	# very low priority")

#define HMT_low()		asm volatile("or 1, 1, 1	# low priority")

#define HMT_medium_low()	asm volatile("or 6, 6, 6	# medium low priority")

#define HMT_medium()		asm volatile("or 2, 2, 2	# medium priority")

#define HMT_medium_high()	asm volatile("or 5, 5, 5	# medium high priority")

#define HMT_high()		asm volatile("or 3, 3, 3	# high priority")

#else

#define HMT_very_low()

#define HMT_low()

#define HMT_medium_low()

#define HMT_medium()

#define HMT_medium_high()

#define HMT_high()

#endif



#ifdef CONFIG_PPC64

#define cpu_relax()	do { HMT_low(); HMT_medium(); barrier(); } while (0)