A lot of targets have more than sufficient space to allow
building the kernel for speed iso size.
Export this performance option to the main config:
- Making it easy accessable for users
- Discarding the need to adjust it in the kernel config each time
when building from scratch and only using "make oldconfig"
Compiling for size is still the default.
Purely informational:
On my cns3xxx board, kernel size increases by ~100kB
but boot time decreased by ~8%.
Signed-off-by: Koen Vandeputte <koen.vandepu...@ncentric.com>
---
config/Config-kernel.in | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index fa06b5044219..b98c5dd04591 100644
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -194,6 +194,22 @@ config KERNEL_DEBUG_GPIO
bool "Compile the kernel with gpio debugging"
select KERNEL_DEBUG_KERNEL
+config KERNEL_CC_OPTIMIZE_FOR_PERFORMANCE
+ bool
+ default y if COMPILE_KERNEL_FOR_SPEED
+ default n
+
+config KERNEL_CC_OPTIMIZE_FOR_SIZE
+ bool
+ default n if COMPILE_KERNEL_FOR_SPEED
+ default y
+
+config COMPILE_KERNEL_FOR_SPEED
+ bool "Optimize the kernel for speed instead of size"
+ default n
+ help
+ This will compile your kernel for maximum speed (-O2) instead of
smaller size (-Os)
+
config KERNEL_COREDUMP
bool
--
2.7.4
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