linux-kernel - [PATCH] arch/x86: Makefile: Move CPU-specific tuning for x86

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Date:   Wed, 17 Aug 2022 10:40:59 +0200 (CEST)
From:   torvic9@...lbox.org
To:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: [PATCH] arch/x86: Makefile: Move CPU-specific tuning for x86_64 to
 Makefile.cpu

The Makefile has a 'FIXME', according to which the CPU-specific tuning
options for 64-bit CPUs should be integrated into a separate file.

Move these cflags to a new file named Makefile.cpu in the same way as for
the 32-bit cflags.

There should be no functional change.

Signed-off-by: Tor Vic <torvic9@...lbox.org>
---
 arch/x86/Makefile     | 8 ++------
 arch/x86/Makefile.cpu | 8 ++++++++
 2 files changed, 10 insertions(+), 6 deletions(-)
 create mode 100644 arch/x86/Makefile.cpu

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 7854685c5f25..c0b4db692544 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -147,12 +147,8 @@ else
 	# Use -mskip-rax-setup if supported.
 	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
 
-        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
-        cflags-$(CONFIG_MK8)		+= -march=k8
-        cflags-$(CONFIG_MPSC)		+= -march=nocona
-        cflags-$(CONFIG_MCORE2)		+= -march=core2
-        cflags-$(CONFIG_MATOM)		+= -march=atom
-        cflags-$(CONFIG_GENERIC_CPU)	+= -mtune=generic
+        # CPU-specific tuning for x86_64
+        include $(srctree)/arch/x86/Makefile.cpu
         KBUILD_CFLAGS += $(cflags-y)
 
         KBUILD_CFLAGS += -mno-red-zone
diff --git a/arch/x86/Makefile.cpu b/arch/x86/Makefile.cpu
new file mode 100644
index 000000000000..6995353f87e8
--- /dev/null
+++ b/arch/x86/Makefile.cpu
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+# CPU tuning section for x86_64
+
+cflags-$(CONFIG_MK8)		+= -march=k8
+cflags-$(CONFIG_MPSC)		+= -march=nocona
+cflags-$(CONFIG_MCORE2)		+= -march=core2
+cflags-$(CONFIG_MATOM)		+= -march=atom
+cflags-$(CONFIG_GENERIC_CPU)	+= -mtune=generic
-- 
2.37.2