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edc4d27255
linux/arch/arm
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Russell King edc4d27255 ARM: sched_clock: make minsec argument to clocks_calc_mult_shift() zero 
The purpose of the minsec argument is to prevent 64-bit math overflow
when the number of cycles is multiplied up.  However, the multipler
is 32-bit, and in the sched_clock() case, the cycle counter is up to
32-bit as well.  So the math can never overflow.

With a value of 60, and clock rates greater than 71MHz, the calculated
multiplier is unnecessarily reduced in value, which reduces accuracy by
maybe 70ppt.  It's almost not worth bothering with as the oscillator
driving the counter won't be any more than 1ppm - unless you're using
a rubidium lamp or caesium fountain frequency standard.

So, set the minsec argument to zero.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-01-11 16:44:02 +00:00
..
boot Merge branches 'ftrace', 'gic', 'io', 'kexec', 'mod', 'sa11x0', 'sh' and 'versatile' into devel 2011-01-05 18:08:10 +00:00
common Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
configs Merge branch 'sgu/mxs-core-v8' of git://git.pengutronix.de/git/ukl/linux-2.6 into imx-for-2.6.38-new 2011-01-03 10:15:11 +01:00
include/asm ARM: sched_clock: allow init_sched_clock() to be called early 2011-01-11 16:23:04 +00:00
kernel ARM: sched_clock: make minsec argument to clocks_calc_mult_shift() zero 2011-01-11 16:44:02 +00:00
lib ARM: udelay: prevent math rounding resulting in short udelays 2011-01-10 23:55:59 +00:00
mach-aaec2000 ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-at91 Merge branch 'clksrc' into devel 2011-01-05 18:09:03 +00:00
mach-bcmring Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-clps711x ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-cns3xxx Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-davinci Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-dove [ARM] Dove: add support for multi-purpose pins configuration 2010-12-15 10:32:30 -05:00
mach-ebsa110 ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-ep93xx Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00
mach-footbridge ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-gemini
mach-h720x ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-imx Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-integrator ARM: integrator: fix compile warning in cpu.c 2011-01-11 13:48:17 +00:00
mach-iop13xx Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-iop32x ARM: io: make iounmap() a simple macro 2010-12-08 13:57:04 +00:00
mach-iop33x ARM: io: make iounmap() a simple macro 2010-12-08 13:57:04 +00:00
mach-ixp4xx Merge branch 'clksrc' into devel 2011-01-05 18:09:03 +00:00
mach-ixp23xx ARM: io: make iounmap() a simple macro 2010-12-08 13:57:04 +00:00
mach-ixp2000
mach-kirkwood Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-ks8695 ARM: DMA: Replace page_to_dma()/dma_to_page() with pfn_to_dma()/dma_to_pfn() 2011-01-03 11:27:43 +00:00
mach-l7200/include/mach
mach-lh7a40x
mach-loki
mach-lpc32xx Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-mmp Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-msm Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-01-06 16:50:35 -08:00
mach-mv78xx0 [ARM] mv78xx: wrong cpu1 window base register address 2010-11-29 10:42:05 -05:00
mach-mx3 Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-mx5 Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-mxc91231 Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-mxs ARM: mxs: Add build configuration for mxs 2010-12-20 17:30:44 +01:00
mach-netx ARM: netx: update clock source registration 2010-12-22 22:44:33 +00:00
mach-nomadik ARM: 6483/1: arm & sh: factorised duplicated clkdev.c 2010-11-26 10:51:04 +00:00
mach-ns9xxx ARM: ns9xxx: update clock source registration 2010-12-22 22:44:34 +00:00
mach-nuc93x ARM: 6483/1: arm & sh: factorised duplicated clkdev.c 2010-11-26 10:51:04 +00:00
mach-omap1 Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-omap2 Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-01-06 16:50:35 -08:00
mach-orion5x Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-pnx4008 Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00
mach-pxa Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-realview Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-rpc ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-s3c24a0/include/mach
mach-s3c64xx ARM: S3C64XX: fix uart clock setup for mini6410/real6410 2010-11-25 10:58:11 +09:00
mach-s3c2400
mach-s3c2410 ARM: S3C2410: Adapt h1940-bluetooth to gpiolib changes 2010-11-25 10:58:10 +09:00
mach-s3c2412 Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-s3c2416 ARM S3C24XX: Fix compilation of PM code for S3C2416 2010-12-17 14:45:01 +09:00
mach-s3c2440 ARM: S3C24XX: Fix mess with gpio {set,get}_pull callbacks 2010-12-08 01:04:56 +00:00
mach-s3c2443 ARM: S3C2443: Select properly ARM core type 2010-11-30 08:44:09 +00:00
mach-s5p64x0
mach-s5p6442
mach-s5pc100
mach-s5pv210 ARM: S5PV210: update MAX8998 platform data to get rid of WARN() 2010-12-17 14:47:42 +09:00
mach-s5pv310 Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-sa1100 Merge branch 'clksrc' into devel 2011-01-05 18:09:03 +00:00
mach-shark ARM: 6484/1: fix compile warning in mm/init.c 2010-11-21 22:05:56 +00:00
mach-shmobile Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-01-06 16:50:35 -08:00
mach-spear3xx
mach-spear6xx
mach-stmp37xx
mach-stmp378x
mach-tcc8k Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-tegra Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-u300 Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-ux500 Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
mach-versatile Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-vexpress Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mach-w90x900 Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
mm Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
nwfpe
oprofile
plat-iop Merge branch 'clksrc' into devel 2011-01-05 18:09:03 +00:00
plat-mxc Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
plat-nomadik Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
plat-omap Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
plat-orion ARM: orion: convert sched_clock() to use new infrastructure 2010-12-22 22:44:49 +00:00
plat-pxa ARM: pxa: support pxa95x 2010-12-18 21:02:14 +08:00
plat-s3c24xx ARM: S3C24XX: Fix CONFIG_S3C_DEV_NAND Kconfig entry 2010-12-17 14:44:54 +09:00
plat-s5p
plat-samsung ARM: S3C24XX: Fix mess with gpio {set,get}_pull callbacks 2010-12-08 01:04:56 +00:00
plat-spear Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
plat-stmp3xxx Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
plat-tcc
plat-versatile Merge branch 'clksrc' into devel 2011-01-05 18:09:03 +00:00
tools ARM: Update mach-types 2010-12-12 23:31:02 +00:00
vfp Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
Kconfig Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
Kconfig-nommu
Kconfig.debug Merge branch 'misc' into devel 2011-01-06 22:32:52 +00:00
Makefile Merge branch 'sgu/mxs-core-v8' of git://git.pengutronix.de/git/ukl/linux-2.6 into imx-for-2.6.38-new 2011-01-03 10:15:11 +01:00