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| author | Rob Herring <rob.herring@calxeda.com> | 2011-03-04 23:51:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-03-09 01:18:48 +0100 |
| commit | bf9dd36091695f1138a98b6ae85d565e60635545 (patch) | |
| tree | 9bdf84901207c037d9d69c566d3a55dd2d5656ec /arch/arm/Kconfig | |
| parent | ARM: 6778/1: compressed/head.S: make LDFLAGS_vmlinux into a recursively expan... (diff) | |
| download | linux-bf9dd36091695f1138a98b6ae85d565e60635545.tar.xz linux-bf9dd36091695f1138a98b6ae85d565e60635545.zip | |
ARM: 6786/1: enable CONFIG_KTIME_SCALAR
Use straight 64-bit values as 64-bit operations are fairly efficient on ARM.
Comparing the asm output with and without KTIME_SCALAR, using 64-bit math
generates clearly better code.
Comparing kernel/hrtimer.c .text size, it goes from 0x1414 to 0x119c with
this change.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ef41f7e39f69..2fec7073f687 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -63,6 +63,10 @@ config GENERIC_CLOCKEVENTS_BROADCAST depends on GENERIC_CLOCKEVENTS default y if SMP +config KTIME_SCALAR + bool + default y + config HAVE_TCM bool select GENERIC_ALLOCATOR |