linux-kernel - [PATCH] powerpc/64: don't select ARCH_HAS_SCALED

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Message-Id: <a8b567c569aa521a7cf1beb061d43d79070e850c.1566492229.git.christophe.leroy@c-s.fr>
Date:   Thu, 22 Aug 2019 16:44:05 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
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 <christophe.leroy@....fr>
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