linux-kernel - [PATCH 7/8] x86: Add Kconfig/Makefile to build hardware prefetch control driver

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Message-Id: <20220125071414.811344-8-tarumizu.kohei@fujitsu.com>
Date:   Tue, 25 Jan 2022 16:14:13 +0900
From:   Kohei Tarumizu <tarumizu.kohei@...itsu.com>
To:     catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     tarumizu.kohei@...itsu.com
Subject: [PATCH 7/8] x86: Add Kconfig/Makefile to build hardware prefetch control driver

This adds Kconfig/Makefile to build hardware prefetch control driver
for x86 support. This also adds a MAINTAINERS entry.

Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
---
 MAINTAINERS                  | 1 +
 arch/x86/Kconfig             | 7 +++++++
 arch/x86/kernel/cpu/Makefile | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 0eaee76438e9..ea049bddc4e6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8448,6 +8448,7 @@ HARDWARE PREFETCH CONTROL DRIVERS
 M:	Kohei Tarumizu <tarumizu.kohei@...itsu.com>
 S:	Maintained
 F:	arch/arm64/kernel/pfctl.c
+F:	arch/x86/kernel/pfctl.c
 F:	drivers/base/pfctl.c
 F:	include/linux/pfctl.h
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ebe8fc76949a..069aee252ba3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -26,6 +26,7 @@ config X86_64
 	depends on 64BIT
 	# Options that are inherently 64-bit kernel only:
 	select ARCH_HAS_GIGANTIC_PAGE
+	select ARCH_HAS_HWPF_CONTROL
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_SOFT_DIRTY
@@ -1377,6 +1378,12 @@ config X86_CPUID
 	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 	  /dev/cpu/31/cpuid.
 
+config X86_HWPF_CONTROL
+	tristate "x86 Hardware Prefetch Control support"
+	depends on HWPF_CONTROL
+	help
+	  This adds Hardware Prefetch Control driver support for X86.
+
 choice
 	prompt "High Memory Support"
 	default HIGHMEM4G
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 9661e3e802be..aec62a6b37d2 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -56,6 +56,8 @@ obj-$(CONFIG_X86_LOCAL_APIC)		+= perfctr-watchdog.o
 obj-$(CONFIG_HYPERVISOR_GUEST)		+= vmware.o hypervisor.o mshyperv.o
 obj-$(CONFIG_ACRN_GUEST)		+= acrn.o
 
+obj-$(CONFIG_X86_HWPF_CONTROL)		+= pfctl.o
+
 ifdef CONFIG_X86_FEATURE_NAMES
 quiet_cmd_mkcapflags = MKCAP   $@
       cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $@ $^
-- 
2.27.0