2019-08-22 21:57:22

by Christophe Leroy

Subject: [PATCH] powerpc/64: don't select ARCH_HAS_SCALED_CPUTIME on book3E

Book3E doesn't have SPRN_SPURR/SPRN_PURR.

Activating ARCH_HAS_SCALED_CPUTIME is just wasting CPU time.

Signed-off-by: Christophe Leroy <[email protected]>
Link: https://github.com/linuxppc/issues/issues/171
---
arch/powerpc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0c322abb1495..6137f5e3bb2d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -132,7 +132,7 @@ config PPC
select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_MEMBARRIER_CALLBACKS
- select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
+ select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UACCESS_FLUSHCACHE
--
2.13.3

2019-08-28 04:26:11

by Michael Ellerman

Subject: Re: [PATCH] powerpc/64: don't select ARCH_HAS_SCALED_CPUTIME on book3E

On Thu, 2019-08-22 at 16:44:05 UTC, Christophe Leroy wrote:
> Book3E doesn't have SPRN_SPURR/SPRN_PURR.
>
> Activating ARCH_HAS_SCALED_CPUTIME is just wasting CPU time.
>
> Signed-off-by: Christophe Leroy <[email protected]>
> Link: https://github.com/linuxppc/issues/issues/171

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/b4645ffc49cfe34f67feda20c34bd7a859c78312

cheers