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.le...@csgroup.eu>
---
arch/powerpc/include/asm/vdso/processor.h | 9 +++++++++
1 file changed, 9 insertions(+)
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)
--
2.25.0
