linux-kernel - [PATCH] Add option to build with -O3

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Date:	Tue, 4 Mar 2014 19:01:49 -0500
From:	Jon Ringle <jringle@...dpoint.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Jon Ringle <jringle@...dpoint.com>
Subject: [PATCH] Add option to build with -O3

Signed-off-by: Jon Ringle <jringle@...dpoint.com>
---
 Makefile     |  2 ++
 init/Kconfig | 19 ++++++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 78209ee..e7f0b3c 100644
--- a/Makefile
+++ b/Makefile
@@ -581,6 +581,8 @@ all: vmlinux

 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS  += -Os $(call cc-disable-warning,maybe-uninitialized,)
+else ifdef CONFIG_CC_OPTIMIZE_FOR_SPEED
+KBUILD_CFLAGS   += -O3
 else
 KBUILD_CFLAGS  += -O2
 endif
diff --git a/init/Kconfig b/init/Kconfig
index 009a797..17d4c62 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1233,13 +1233,26 @@ source "usr/Kconfig"

 endif

+choice
+    prompt "Optimize"
+
+config CC_OPTIMIZE_NORMAL
+    bool "Optimize Normal (-O2)"
+    help
+      Enabling this option will pass "-O2" to gcc
 config CC_OPTIMIZE_FOR_SIZE
-       bool "Optimize for size"
+       bool "Optimize for size (-Os)"
        help
-         Enabling this option will pass "-Os" instead of "-O2" to gcc
+         Enabling this option will pass "-Os" to gcc
          resulting in a smaller kernel.

-         If unsure, say N.
+config CC_OPTIMIZE_FOR_SPEED
+    bool "Optimze for speed (-O3)"
+    help
+      Enabling this option will pass "-O3" to gcc
+      resulting in a larger kernel (but possibly faster)
+
+endchoice

 config SYSCTL
        bool
--
1.8.5.4


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