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0644079410
linux/arch/powerpc/kernel
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Anton Blanchard 0644079410 powerpc/kdump: CPUs assume the context of the oopsing CPU 
We wrap the crash_shutdown_handles[] calls with longjmp/setjmp, so if any
of them fault we can recover. The problem is we add a hook to the debugger
fault handler hook which calls longjmp unconditionally.

This first part of kdump is run before we marshall the other CPUs, so there
is a very good chance some CPU on the box is going to page fault. And when
it does it hits the longjmp code and assumes the context of the oopsing CPU.
The machine gets very confused when it has 10 CPUs all with the same stack,
all thinking they have the same CPU id. I get even more confused trying
to debug it.

The patch below adds crash_shutdown_cpu and uses it to specify which cpu is
in the protected region. Since it can only be -1 or the oopsing CPU, we don't
need to use memory barriers since it is only valid on the local CPU - no other
CPU will ever see a value that matches it's local CPU id.

Eventually we should switch the order and marshall all CPUs before doing the
crash_shutdown_handles[] calls, but that is a bigger fix.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-05-21 17:31:10 +10:00
..
vdso32 powerpc: Fix segment mapping in vdso32 2009-10-27 16:42:40 +11:00
vdso64 Use macros for .data.page_aligned section. 2009-09-21 06:27:08 +02:00
.gitignore powerpc: Ignore generated vmlinux.lds in git 2008-10-07 14:26:18 +11:00
align.c powerpc: Handle VSX alignment faults correctly in little-endian mode 2009-12-18 14:55:43 +11:00
asm-offsets.c powerpc/fsl-booke: Move loadcam_entry back to asm code to fix SMP ftrace 2010-05-17 10:56:20 -05:00
audit.c
btext.c powerpc: Use the common ascii hex helpers 2008-08-20 16:34:57 +10:00
cacheinfo.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
cacheinfo.h powerpc: Rewrite sysfs processor cache info code 2009-01-08 16:25:10 +11:00
clock.c
compat_audit.c
cpu_setup_6xx.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
cpu_setup_44x.S AMCC PPC 460SX redwood SoC platform initial framework 2009-02-14 14:41:29 -05:00
cpu_setup_fsl_booke.S powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs 2009-06-15 21:45:30 -05:00
cpu_setup_pa6t.S
cpu_setup_ppc970.S powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit 2008-09-15 11:08:35 -07:00
cputable.c powerpc/4xx: Simple platform for the ISS 4xx simulator 2010-05-05 11:11:56 -04:00
crash_dump.c powerpc: Unify opcode definitions and support 2009-02-23 10:48:56 +11:00
crash.c powerpc/kdump: CPUs assume the context of the oopsing CPU 2010-05-21 17:31:10 +10:00
dbell.c powerpc: Add support for using doorbells for SMP IPI 2009-02-23 15:53:03 +11:00
dma-iommu.c powerpc: Change archdata dma_data to a union 2009-09-24 15:31:43 +10:00
dma-swiotlb.c powerpc: Kill unused swiotlb variable 2009-11-24 17:00:24 +11:00
dma.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
e500-pmu.c powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
entry_32.S powerpc/47x: Base ppc476 support 2010-05-05 09:11:10 -04:00
entry_64.S powerpc: Clear MSR_RI during RTAS calls 2010-02-09 13:56:24 +11:00
exceptions-64e.S powerpc/book3e-64: Remove duplicated #include 2009-09-24 15:31:41 +10:00
exceptions-64s.S powerpc: Disable interrupts for data breakpoint exceptions 2010-04-07 14:44:38 +10:00
firmware.c powerpc: Make powerpc_firmware_features __read_mostly 2010-02-09 13:56:07 +11:00
fpu.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
ftrace.c Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-20 10:56:46 -07:00
head_8xx.S powerpc/8xx: Use SPRG2 and DAR registers to stash r11 and cr. 2010-04-07 18:00:34 +10:00
head_32.S powerpc: gamecube/wii: early debugging using usbgecko 2009-12-12 22:24:31 -07:00
head_40x.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
head_44x.S powerpc/4xx: Simple platform for the ISS 4xx simulator 2010-05-05 11:11:56 -04:00
head_64.S powerpc: Reset kernel stack on cpu online from cede state 2010-03-09 11:57:10 +11:00
head_booke.h powerpc/booke: Add Stack Marking support to Booke Exception Prolog 2010-05-05 08:01:52 -04:00
head_fsl_booke.S powerpc/fsl-booke: Fix InstructionTLBError execute permission check 2010-05-17 10:56:16 -05:00
ibmebus.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
idle_6xx.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_e500.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_power4.S
idle.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
init_task.c Use new __init_task_data macro in arch init_task.c files. 2009-09-21 06:27:08 +02:00
io.c powerpc: tiny memcpy_(to|from)io optimisation 2009-11-04 16:43:12 -07:00
iomap.c
iommu.c powerpc: Remove IOMMU_VMERGE config option 2010-03-19 16:38:16 +11:00
irq.c powerpc/cpumask: Convert fixup_irqs to new cpumask API 2010-05-06 17:16:14 +10:00
isa-bridge.c [POWERPC] Remove leftover printk in isa-bridge.c 2008-05-09 20:22:59 +10:00
kgdb.c powerpc/booke: Introduce new CONFIG options for advanced debug registers 2010-02-17 14:03:16 +11:00
kprobes.c powerpc/476: Add isync after loading mmu and debug spr's 2010-05-05 10:39:13 -04:00
l2cr_6xx.S
legacy_serial.c Fix spelling of 'platform' in comments and doc 2010-02-05 12:22:34 +01:00
lparcfg.c powerpc/pseries: Export data from new hcall H_EM_GET_PARMS 2010-04-07 18:00:29 +10:00
machine_kexec_32.c kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
machine_kexec_64.c Use new __init_task_data macro in arch init_task.c files. 2009-09-21 06:27:08 +02:00
machine_kexec.c powerpc: Allow mem=x cmdline to work with 4G+ 2009-05-15 16:43:41 +10:00
Makefile powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
misc_32.S powerpc/47x: Base ppc476 support 2010-05-05 09:11:10 -04:00
misc_64.S powerpc: Move VMX and VSX asm code to vector.S 2009-06-09 16:46:25 +10:00
misc.S perf: Always build the powerpc perf_arch_fetch_caller_regs version 2010-04-03 12:42:00 +02:00
module_32.c powerpc/ppc32: ftrace, dynamic ftrace to handle modules 2008-11-20 10:52:53 -08:00
module_64.c powerpc: Unify opcode definitions and support 2009-02-23 10:48:56 +11:00
module.c module: cleanup FIXME comments about trimming exception table entries. 2009-06-12 21:47:05 +09:30
mpc7450-pmu.c perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
msi.c powerpc/PCI: include pci.h in powerpc MSI implementation 2009-03-25 08:54:29 -07:00
nvram_64.c arch/powerpc: Fix continuation line formats 2010-02-09 13:55:05 +11:00
of_device.c powerpc/of: Fix usage of dev_set_name() in of_device_alloc() 2009-06-26 16:55:35 +10:00
of_platform.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
paca.c powerpc: Dynamically allocate pacas 2010-03-09 11:52:52 +11:00
pci_32.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pci_64.c of: add 'of_' prefix to machine_is_compatible() 2010-02-09 08:33:00 -07:00
pci_dn.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pci_of_scan.c powerpc/pci: Check devices status property when scanning OF tree 2010-05-21 17:31:09 +10:00
pci-common.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
perf_callchain.c perf: Fix inconsistency between IP and callchain sampling 2010-01-28 14:31:20 +01:00
perf_event_fsl_emb.c powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
perf_event.c perf, ppc: Fix compile error due to new cpu notifiers 2010-03-11 15:21:27 +01:00
pmc.c powerpc: Convert pmc_owner_lock to raw_spinlock 2010-02-19 14:52:33 +11:00
power4-pmu.c perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
power5-pmu.c powerpc: perf_event: Enable SDAR in continous sample mode 2009-10-28 16:13:02 +11:00
power5+-pmu.c powerpc: perf_event: Enable SDAR in continous sample mode 2009-10-28 16:13:02 +11:00
power6-pmu.c powerpc: perf_event: Enable SDAR in continous sample mode 2009-10-28 16:13:02 +11:00
power7-pmu.c powerpc: perf_event: Enable SDAR in continous sample mode 2009-10-28 16:13:02 +11:00
ppc32.h powerpc: Add VSX context save/restore, ptrace and signal support 2008-07-01 11:28:50 +10:00
ppc970-pmu.c powerpc: perf_event: Enable SDAR in continous sample mode 2009-10-28 16:13:02 +11:00
ppc_ksyms.c KVM: PPC: Export __giveup_vsx 2010-03-01 12:35:52 -03:00
ppc_save_regs.S powerpc: Prepare xmon_save_regs for use with kdump 2008-12-23 15:13:28 +11:00
proc_powerpc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
process.c powerpc/476: Add isync after loading mmu and debug spr's 2010-05-05 10:39:13 -04:00
prom_init_check.sh powerpc: Print linux_banner in prom_init 2009-03-11 17:11:33 +11:00
prom_init.c powerpc/numa: Add form 1 NUMA affinity 2010-04-28 16:22:33 +10:00
prom_parse.c powerpc: Fix of_node_put() exit path in of_irq_map_one() 2009-04-20 12:18:43 -06:00
prom.c powerpc: Dynamically allocate pacas 2010-03-09 11:52:52 +11:00
ptrace32.c headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
ptrace.c powerpc: Add kprobe-based event tracer 2010-04-07 18:11:43 +10:00
reloc_64.S powerpc: Make the 64-bit kernel as a position-independent executable 2008-09-15 11:08:38 -07:00
rtas_flash.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtas_pci.c powerpc/pci: Clean up direct access to sysdata by RTAS 2009-05-21 15:44:23 +10:00
rtas-proc.c powerpc: Move /proc/ppc64 to /proc/powerpc update 2010-01-15 13:26:17 +11:00
rtas-rtc.c
rtas.c powerpc/pseries: Call ibm,os-term if the ibm,extended-os-term is present 2010-04-07 18:00:48 +10:00
rtasd.c powerpc/rtasd: Don't start event scan if scan rate is zero 2010-05-21 17:29:39 +10:00
setup_32.c powerpc: Fix swiotlb to respect the boot option 2010-03-19 16:38:16 +11:00
setup_64.c powerpc: Use common cpu_die (fixes SMP+SUSPEND build) 2010-05-21 17:31:08 +10:00
setup-common.c powerpc/cpumask: Update some comments 2010-05-06 17:41:59 +10:00
setup.h
signal_32.c powerpc/booke: Add support for advanced debug registers 2010-02-17 14:03:17 +11:00
signal_64.c powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
signal.c powerpc/booke: Add support for advanced debug registers 2010-02-17 14:03:17 +11:00
signal.h powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
smp-tbsync.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
smp.c powerpc: Use common cpu_die (fixes SMP+SUSPEND build) 2010-05-21 17:31:08 +10:00
softemu8xx.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
stacktrace.c powerpc: Removed duplicated include in stacktrace.c 2008-07-28 16:30:47 +10:00
suspend.c PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
swsusp_32.S powerpc/swsusp_32: Fix TLB invalidation 2010-01-15 13:20:07 +11:00
swsusp_64.c
swsusp_asm64.S powerpc: Fix 64-bit hibernation with 64k pages 2008-10-07 14:26:20 +11:00
swsusp.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
sys_ppc32.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
syscalls.c Add generic sys_olduname() 2010-03-12 15:52:32 -08:00
sysfs.c sysfs/cpu: Add probe/release files 2009-12-09 17:09:33 +11:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
time.c powerpc: Add timer, performance monitor and machine check counts to /proc/interrupts 2010-02-17 14:02:49 +11:00
traps.c powerpc/476: add machine check handler for 47x core 2010-05-05 09:27:22 -04:00
udbg_16550.c trivial: fix typo "for for" in multiple files 2009-09-21 15:14:54 +02:00
udbg.c powerpc: gamecube/wii: early debugging using usbgecko 2009-12-12 22:24:31 -07:00
vdso.c tree-wide: fix a very frequent spelling mistake 2009-11-09 09:40:54 +01:00
vecemu.c
vector.S powerpc: Fix usage of 64-bit instruction in 32-bit altivec code 2009-12-09 18:10:12 +11:00
vio.c powerpc/vio: Switch VIO Bus PM to use generic helpers 2010-05-21 17:31:09 +10:00
vmlinux.lds.S module: handle ppc64 relocating kcrctabs when CONFIG_RELOCATABLE=y 2009-12-15 16:28:34 +10:30