diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-08-25 13:34:45 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-08-27 00:56:52 +1000 |
| commit | 8149238ffd210875f5a77e3c654bb59b58da35e3 (patch) | |
| tree | d7d83b4775018f0f38543db7cbad8f6f60b54d13 /arch/powerpc/include | |
| parent | f50da6edbf1ebf35dd8070847bfab5cb988d472b (diff) | |
| download | lwn-8149238ffd210875f5a77e3c654bb59b58da35e3.tar.gz lwn-8149238ffd210875f5a77e3c654bb59b58da35e3.zip | |
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 5f7c690728ac ("[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: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c5a07fadea33d640ad10cecf0ac8faaec1c524e0.1629898474.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/vdso/processor.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vdso/processor.h b/arch/powerpc/include/asm/vdso/processor.h index e072577bc7c0..8d79f994b4aa 100644 --- a/arch/powerpc/include/asm/vdso/processor.h +++ b/arch/powerpc/include/asm/vdso/processor.h @@ -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) |