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ARM: 6786/1: enable CONFIG_KTIME_SCALAR

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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>
This commit is contained in:
Rob Herring 2011-03-04 23:51:59 +01:00 committed by Russell King
parent 1cf7cf06c9
commit bf9dd36091
1 changed files with 4 additions and 0 deletions
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arch/arm/Kconfig
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@ -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