linux-kernel - [PATCH] x86/build: remove code effective only for GCC older than 4.0

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Date:   Mon,  9 Jul 2018 21:07:21 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86/build: remove code effective only for GCC older than 4.0

Commit e501ce957a78 ("x86: Force asm-goto") bumped the minimum GCC
version to 4.5 for building the x86 kernel.

arch/x86/Makefile no longer needs to take care of older GCC versions.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 arch/x86/Makefile | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index a08e828..7e3c07d 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -80,11 +80,6 @@ ifeq ($(CONFIG_X86_32),y)
         # alignment instructions.
         KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))
 
-        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
-        # a lot more stack due to the lack of sharing of stacklots:
-        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
-				$(call cc-option,-fno-unit-at-a-time))
-
         # CPU-specific tuning. Anything which can be shared with UML should go here.
         include arch/x86/Makefile_32.cpu
         KBUILD_CFLAGS += $(cflags-y)
-- 
2.7.4