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linux/arch/powerpc/kernel
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Nathan Lynch 5db9fa9593 [POWERPC] Fix gettimeofday inaccuracies 
There are two problems in the powerpc gettimeofday code which can
cause incorrect results to be returned.

The first is that there is a race between do_gettimeofday and the
timer interrupt:

1. do_gettimeofday does get_tb()

2. decrementer exception on boot cpu which runs timer_recalc_offset,
   which also samples the timebase and updates the do_gtod structure
   with a greater timebase value.

3. do_gettimeofday calls __do_gettimeofday, which leads to the
   negative result from tb_val - temp_varp->tb_orig_stamp.

The second is caused by taking the boot cpu offline, which can cause
the value of tb_last_jiffy to be increased past the currently
available timebase, causing the same underflow as above.

[paulus@samba.org - define and use data_barrier() instead of mb().]

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-08-23 15:51:18 +10:00
..
vdso32 [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
vdso64 [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
align.c [PATCH] powerpc: Implement support for setting little-endian mode via prctl 2006-06-09 21:24:15 +10:00
asm-offsets.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
binfmt_elf32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
btext.c [POWERPC] Fix various offb and BootX-related issues 2006-07-03 17:19:48 +10:00
cpu_setup_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpu_setup_power4.S [POWERPC] powerpc: Clear HID0 attention enable on PPC970 at boot time 2006-08-18 07:23:29 +10:00
cputable.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
crash_dump.c [PATCH] powerpc: Kdump header cleanup 2006-05-19 15:02:16 +10:00
crash.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
dma_64.c
entry_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
entry_64.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
firmware.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
fpu.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_4xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_8xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_44x.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_64.S [POWERPC] force 64bit mode in fwnmi handlers to workaround firmware bugs 2006-07-29 04:07:08 +10:00
head_booke.h
head_fsl_booke.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ibmebus.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
idle_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
idle_power4.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
idle.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
init_task.c
iomap.c [PATCH] powerpc: remove io_page_mask 2006-04-22 18:45:05 +10:00
iommu.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
irq.c [POWERPC] Fix irq radix tree remapping typo 2006-08-17 16:41:11 +10:00
kprobes.c [POWERPC] kprobes: Fix possible system crash during out-of-line single-stepping 2006-08-17 16:41:10 +10:00
l2cr_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
legacy_serial.c [POWERPC] Fix legacy_serial.c error handling on 32 bits 2006-07-26 01:27:27 +10:00
lparcfg.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
lparmap.c
machine_kexec_32.c Storage class should be first 2006-06-26 18:57:34 +02:00
machine_kexec_64.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
machine_kexec.c [POWERPC] Move some kexec logic into machine_kexec.c 2006-08-17 16:41:10 +10:00
Makefile [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
misc_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
misc_64.S [POWERPC] Minor comment fix for misc_64.S 2006-07-31 14:37:46 +10:00
misc.S [POWERPC] Consolidate some of kernel/misc*.S 2006-06-28 15:19:00 +10:00
module_32.c
module_64.c [PATCH] powerpc64: Fix loading of modules without a .toc section 2006-04-28 21:04:49 +10:00
nvram_64.c [PATCH] nvram_print_partitions cosmetic fixup 2006-04-29 18:08:05 +10:00
of_device.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
paca.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci_32.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
pci_64.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
pci_direct_iommu.c [POWERPC] cleanup dma_mapping_ops 2006-06-15 19:31:26 +10:00
pci_dn.c [PATCH] powerpc: clean up iSeries PCI probe 2006-05-24 16:08:57 +10:00
pci_iommu.c [POWERPC] cleanup dma_mapping_ops 2006-06-15 19:31:26 +10:00
perfmon_fsl_booke.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pmc.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ppc32.h
ppc_ksyms.c [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
proc_ppc64.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
process.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
prom_init.c [POWERPC] Fix 32 bits warning in prom_init.c 2006-07-26 01:26:43 +10:00
prom_parse.c [PATCH] powerpc: make OF interrupt tree parsing more strict 2006-07-10 13:24:20 -07:00
prom.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
ptrace32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ptrace-common.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ptrace.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
rtas_flash.c [PATCH] powerpc: reorg RTAS delay code 2006-06-09 21:21:06 +10:00
rtas_pci.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
rtas-proc.c [PATCH] powerpc: Avoid __initcall warnings 2006-04-13 09:27:26 -07:00
rtas-rtc.c [PATCH] powerpc: reorg RTAS delay code 2006-06-09 21:21:06 +10:00
rtas.c [POWERPC] Fix might-sleep warning on removing cpus 2006-08-08 16:00:11 +10:00
semaphore.c
setup_32.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
setup_64.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
setup-common.c [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
setup.h [PATCH] powerpc: Make early xmon logic immune to location of early parsing 2006-05-19 15:02:12 +10:00
signal_32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
signal_64.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smp-tbsync.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smp.c [POWERPC] Fix non-MPIC CHRPs with CONFIG_SMP set 2006-07-26 01:27:04 +10:00
swsusp_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
sys_ppc32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
syscalls.c
sysfs.c [PATCH] cpu hotplug: replace __devinit* with __cpuinit* for cpu notifications 2006-07-31 13:28:39 -07:00
systbl.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tau_6xx.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
time.c [POWERPC] Fix gettimeofday inaccuracies 2006-08-23 15:51:18 +10:00
traps.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
udbg_16550.c [POWERPC] Fix default clock for udbg_16550 2006-07-26 01:27:13 +10:00
udbg.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vdso.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vecemu.c
vector.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vio.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
vmlinux.lds.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00