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3e7b484354
linux/arch/powerpc
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Stefan Roese 3e7b484354 powerpc: Fix decrementer setup on 1GHz boards 
We noticed that recent kernels didn't boot on our 1GHz Canyonlands 460EX
boards anymore. As it seems, patch 8d165db1 [powerpc: Improve
decrementer accuracy] introduced this problem. The routine div_sc()
overflows with shift = 32 resulting in this incorrect setup:

time_init: decrementer frequency = 1000.000012 MHz
time_init: processor frequency   = 1000.000012 MHz
clocksource: timebase mult[400000] shift[22] registered
clockevent: decrementer mult[33] shift[32] cpu[0]

This patch now introduces a local div_dc64() version of this function
so that this overflow doesn't happen anymore.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Detlev Zundel <dzu@denx.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-01-15 13:26:15 +11:00
..
boot zlib: Fix build of powerpc boot wrapper 2010-01-13 16:13:39 -08:00
configs powerpc/defconfigs: Set HZ=100 on pseries and ppc64 defconfigs 2009-12-18 14:54:26 +11:00
include/asm powerpc: cpumask_of_node() should handle -1 as a node 2010-01-15 13:20:08 +11:00
kernel powerpc: Fix decrementer setup on 1GHz boards 2010-01-15 13:26:15 +11:00
kvm KVM: powerpc: Fix mtsrin in book3s_64 mmu 2009-12-27 13:36:34 -02:00
lib locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
math-emu powerpc/math-emu: Fix efp dependence 2009-03-11 06:00:08 -05:00
mm powerpc: Use helpers for rlimits 2010-01-15 13:20:08 +11:00
oprofile tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
platforms powerpc/iseries: Initialise on-stack completion 2010-01-15 13:26:14 +11:00
sysdev Merge commit 'kumar/next' into merge 2009-12-21 09:30:42 +11:00
xmon powerpc/pseries: Add extended_cede_processor() helper function. 2009-11-24 14:33:03 +11:00
Kconfig Merge branch 'next' of git://git.secretlab.ca/git/linux-2.6 2009-12-16 13:26:53 -08:00
Kconfig.debug Merge branch 'next' of git://git.secretlab.ca/git/linux-2.6 2009-12-16 13:26:53 -08:00
Makefile powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE 2009-09-24 15:31:40 +10:00
relocs_check.pl powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE 2009-09-24 15:31:40 +10:00