Richard Mortimer 9eb3394bf2 [SPARC64]: Eliminate race condition reading Hummingbird STICK register ... Ensure a consistent value is read from the STICK register by ensuring that both high and low are read without high changing due to a roll over of the low register. Various Debian/SPARC users (myself include) have noticed problems with Hummingbird based systems. The symptoms are that the system time is seen to jump forward 3 days, 6 hours, 11 minutes give or take a few seconds. In many cases the system then hangs some time afterwards. I've spotted a race condition in the code to read the STICK register. I could not work out why 3d, 6h, 11m is important but guess that it is due to the 2^32 jump of STICK (forwards on one read and then the next read will seem to be backwards) during a timer interrupt. I'm guessing that a change of -2^32 will get converted to a large unsigned increment after the arithmetic manipulation between STICK, nanoseconds, jiffies etc. I did a test where I modified __hbird_read_stick to artificially inject rollover faults forcefully every few seconds. With this I saw the clock jump over 6 times in 12 hours compared to once every month or so. Signed-off-by: Richard Mortimer <richm@oldelvet.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>		2006-01-17 15:21:01 -08:00
..
asm-offsets.c	kbuild: frv,m32r,sparc64 introduce fake asm-offsets.h file	2005-09-09 22:47:53 +02:00
auxio.c	[SPARC64]: Get rid of fast IRQ feature.	2005-06-27 17:04:45 -07:00
binfmt_aout32.c	[PATCH] dump_thread() cleanup	2006-01-10 08:01:25 -08:00
binfmt_elf32.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
central.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
chmc.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
cpu.c	[SPARC64]: Use ARRAY_SIZE macro	2005-11-09 12:03:42 -08:00
devices.c	[SPARC64]: Probe D/I/E-cache config and use.	2005-09-26 00:32:17 -07:00
dtlb_backend.S	[SPARC64]: Kill SZ_BITS define from dtlb_backend.S	2005-09-21 19:23:48 -07:00
dtlb_base.S	[SPARC64]: Fix boot failures on SunBlade-150	2005-10-12 12:22:46 -07:00
dtlb_prot.S	[SPARC64]: Fix boot failures on SunBlade-150	2005-10-12 12:22:46 -07:00
ebus.c	[PATCH] PCI: pci_find_device remove (sparc64/kernel/ebus.c)	2006-01-09 12:13:15 -08:00
entry.S	[SPARC64]: Fix ptrace/strace	2006-01-09 14:35:50 -08:00
etrap.S	[SPARC64]: Replace cheetah+ code patching with variables.	2005-10-04 15:23:20 -07:00
head.S	[SPARC64]: Fix boot failures on SunBlade-150	2005-10-12 12:22:46 -07:00
idprom.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
init_task.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
iommu_common.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
iommu_common.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
irq.c	[SPARC64]: Fix compile error in irq.c	2005-10-08 21:12:04 -07:00
isa.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
itlb_base.S	[SPARC64]: Fix boot failures on SunBlade-150	2005-10-12 12:22:46 -07:00
kprobes.c	[PATCH] kprobes: fix race in recovery of reentrant probe	2006-01-11 18:42:12 -08:00
ktlb.S	[SPARC64]: Fix boot failures on SunBlade-150	2005-10-12 12:22:46 -07:00
Makefile	[PATCH] sanitize building of fs/compat_ioctl.c	2006-01-10 08:01:33 -08:00
module.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pci_common.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pci_impl.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pci_iommu.c	[SPARC64]: Eliminate PCI IOMMU dma mapping size limit.	2005-10-13 22:15:24 -07:00
pci_psycho.c	[SPARC64]: Consolidate common PCI IOMMU init code.	2005-10-13 21:10:08 -07:00
pci_sabre.c	[SPARC64]: Consolidate common PCI IOMMU init code.	2005-10-13 21:10:08 -07:00
pci_schizo.c	[SPARC64]: Consolidate common PCI IOMMU init code.	2005-10-13 21:10:08 -07:00
pci.c	[PATCH] Make sparc64 use setup-res.c	2005-09-08 14:57:25 -07:00
power.c	[SPARC64]: Add needed pm_power_off symbol.	2006-01-09 14:12:50 -08:00
process.c	[PATCH] sparc64: task_stack_page()	2006-01-12 09:08:52 -08:00
ptrace.c	[PATCH] sparc64: task_pt_regs()	2006-01-12 09:08:52 -08:00
rtrap.S	[SPARC64]: Fix userland FPU state corruption.	2005-10-07 13:30:49 -07:00
sbus.c	[PATCH] unpaged: fix sound Bad page states	2005-11-22 09:13:43 -08:00
semaphore.c	[SPARC64]: Avoid membar instructions in delay slots.	2005-06-27 15:42:04 -07:00
setup.c	[PATCH] sparc64: task_thread_info()	2006-01-12 09:08:52 -08:00
signal32.c	[SPARC64] mm: don't re-evaluate *ptep	2005-11-07 14:08:46 -08:00
signal.c	[PATCH] convert signal handling of NODEFER to act like other Unix boxes.	2005-08-29 10:03:11 -07:00
smp.c	[PATCH] sparc64: task_thread_info()	2006-01-12 09:08:52 -08:00
sparc64_ksyms.c	[PATCH] dump_thread() cleanup	2006-01-10 08:01:25 -08:00
starfire.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
sunos_ioctl32.c	[SPARC]: Kill remaining kbio.h references.	2005-11-07 14:12:21 -08:00
sys32.S	[SPARC64]: Fix fault handling in unaligned trap handler.	2005-09-28 20:41:45 -07:00
sys_sparc32.c	[PATCH] capable/capability.h (arch/)	2006-01-11 18:42:14 -08:00
sys_sparc.c	[PATCH] Avoiding mmap fragmentation	2005-06-21 18:46:16 -07:00
sys_sunos32.c	[PATCH] capable/capability.h (arch/)	2006-01-11 18:42:14 -08:00
systbls.S	Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6	2006-01-10 08:28:53 -08:00
time.c	[SPARC64]: Eliminate race condition reading Hummingbird STICK register	2006-01-17 15:21:01 -08:00
trampoline.S	[SPARC64]: Replace cheetah+ code patching with variables.	2005-10-04 15:23:20 -07:00
traps.c	[PATCH] sparc64: task_stack_page()	2006-01-12 09:08:52 -08:00
ttable.S	[SPARC64]: Revamp Spitfire error trap handling.	2005-08-29 12:45:11 -07:00
una_asm.S	[SPARC64]: Fix fault handling in unaligned trap handler.	2005-09-28 20:41:45 -07:00
unaligned.c	[SPARC64]: Fix fault handling in unaligned trap handler.	2005-09-28 20:41:45 -07:00
us2e_cpufreq.c	[PATCH] kfree cleanup: arch	2005-11-07 07:54:06 -08:00
us3_cpufreq.c	[PATCH] kfree cleanup: arch	2005-11-07 07:54:06 -08:00
vmlinux.lds.S	[SPARC]: Use STABS_DEBUG and DWARF_DEBUG macros in vmlinux.lds.S	2005-12-28 13:22:54 -08:00
winfixup.S	[SPARC64]: Replace cheetah+ code patching with variables.	2005-10-04 15:23:20 -07:00