[PATCH 5/7] x86: remove cc-option-yn test for -mtune=

[Nick Desaulniers <ndesaulniers@google.com>]

As noted in the comment, -mtune= has been supported since GCC 3.4. The
minimum required version of GCC to build the kernel (as specified in
Documentation/process/changes.rst) is GCC 4.9.

tune is not immediately expanded. Instead it defines a macro that will
test via cc-option later values for -mtune=. But we can skip the test
whether to use -mtune= vs. -mcpu=.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 arch/x86/Makefile_32.cpu | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
index cd3056759880..e7355f8b51c2 100644
--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -2,13 +2,7 @@
 # CPU tuning section - shared with UML.
 # Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
 
-#-mtune exists since gcc 3.4
-HAS_MTUNE	:= $(call cc-option-yn, -mtune=i386)
-ifeq ($(HAS_MTUNE),y)
 tune		= $(call cc-option,-mtune=$(1),$(2))
-else
-tune		= $(call cc-option,-mcpu=$(1),$(2))
-endif
 
 cflags-$(CONFIG_M486SX)		+= -march=i486
 cflags-$(CONFIG_M486)		+= -march=i486
-- 
2.33.0.rc1.237.g0d66db33f3-goog