ARM: 6786/1: enable CONFIG_KTIME_SCALAR · bf9dd36091 - Gogs

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>

Rob Herring 14 years ago

parent

1cf7cf06c9

commit

bf9dd36091

1 changed files with 4 additions and 0 deletions

Split View Show Diff Stats

						
							+ 4
							
							- 0
						
arch/arm/Kconfig
							 
								View File
							
				@@ -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