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Paul Mackerras 0fe1ac48be powerpc/perf_event: Fix oops due to perf_event_do_pending call 
Anton Blanchard found that large POWER systems would occasionally
crash in the exception exit path when profiling with perf_events.
The symptom was that an interrupt would occur late in the exit path
when the MSR[RI] (recoverable interrupt) bit was clear.  Interrupts
should be hard-disabled at this point but they were enabled.  Because
the interrupt was not recoverable the system panicked.

The reason is that the exception exit path was calling
perf_event_do_pending after hard-disabling interrupts, and
perf_event_do_pending will re-enable interrupts.

The simplest and cleanest fix for this is to use the same mechanism
that 32-bit powerpc does, namely to cause a self-IPI by setting the
decrementer to 1.  This means we can remove the tests in the exception
exit path and raw_local_irq_restore.

This also makes sure that the call to perf_event_do_pending from
timer_interrupt() happens within irq_enter/irq_exit.  (Note that
calling perf_event_do_pending from timer_interrupt does not mean that
there is a possible 1/HZ latency; setting the decrementer to 1 ensures
that the timer interrupt will happen immediately, i.e. within one
timebase tick, which is a few nanoseconds or 10s of nanoseconds.)

Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: stable@kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-05-12 14:34:00 +10:00
..
iseries powerpc/iseries: Fix pci breakage due to bad dma_data initialization 2009-05-15 16:43:41 +10:00
8xx_immap.h
8253pit.h time: move PIT_TICK_RATE to linux/timex.h 2009-06-16 19:47:27 -07:00
abs_addr.h
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
asm-compat.h powerpc/perf_events: Fix call-graph recording, add perf_arch_fetch_caller_regs 2010-03-18 06:48:29 +01:00
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
async_tx.h ppc440spe-adma: adds updated ppc440spe adma driver 2009-12-11 21:24:44 -07:00
atomic.h powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER 2010-02-17 14:03:15 +11:00
auxvec.h
backlight.h
bitops.h powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER 2010-02-17 14:03:15 +11:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bootx.h
btext.h
bug.h powerpc: Convert BUG() to use unreachable() 2009-12-18 14:54:27 +11:00
bugs.h
byteorder.h
cache.h
cacheflush.h block: add helpers to run flush_dcache_page() against a bio and a request's pages 2009-11-26 09:16:19 +01:00
cell-pmu.h
cell-regs.h powerpc/cell: Move CBE_IOPTE_* to <asm/cell-regs.h> 2009-08-20 10:29:26 +10:00
checksum.h
clk_interface.h
code-patching.h
compat.h improve sys_newuname() for compat architectures 2010-03-12 15:52:32 -08:00
cpm.h powerpc/qe&cpm: Implement static inline stubs for non-QE/CPM builds 2009-11-11 21:43:20 -06:00
cpm1.h powerpc/cpm: Remove SPI defines and spi structs 2009-11-11 21:43:17 -06:00
cpm2.h powerpc/cpm: Move CPMFCR_* defines into cpm.h 2009-11-11 21:43:19 -06:00
cputable.h powerpc: Use lwsync for acquire barrier if CPU supports it 2010-02-17 14:03:16 +11:00
cputhreads.h powerpc/mm: Add HW threads support to no_hash TLB management 2009-08-20 10:12:37 +10:00
cputime.h powerpc: Replace per_cpu(, smp_processor_id()) with __get_cpu_var() 2010-02-03 17:39:48 +11:00
current.h
dbdma.h
dbell.h
dcr-generic.h
dcr-mmio.h
dcr-native.h
dcr-regs.h ppc440spe-adma: adds updated ppc440spe adma driver 2009-12-11 21:24:44 -07:00
dcr.h
delay.h powerpc: Fix spin_event_timeout() to be robust over context switches 2009-07-08 13:50:24 +10:00
device.h powerpc: Change archdata dma_data to a union 2009-09-24 15:31:43 +10:00
disassemble.h
div64.h
dma-mapping.h dma-mapping: powerpc: use generic pci_set_dma_mask and pci_set_consistent_dma_mask 2010-03-12 15:52:42 -08:00
dma.h
edac.h
eeh.h
eeh_event.h
elf.h powerpc: TIF_ABI_PENDING bit removal 2010-02-01 14:00:30 +11:00
emergency-restart.h
emulated_ops.h powerpc: perf_event: Add alignment-faults and emulation-faults software events 2009-10-28 16:13:03 +11:00
errno.h
exception-64e.h powerpc/book3e-64: Add helper function to setup IVORs 2009-08-28 14:24:13 +10:00
exception-64s.h Make head_64.S aware of KVM real mode code 2009-11-05 16:49:57 +11:00
fb.h
fcntl.h
feature-fixups.h powerpc: Fix lwsync feature fixup vs. modules on 64-bit 2010-02-26 18:29:17 +11:00
firmware.h powerpc: Fix hypervisor TLB batching 2009-10-14 16:58:37 +11:00
fixmap.h powerpc: reserve fixmap entries for early debug 2009-12-12 22:24:30 -07:00
floppy.h
fs_pd.h
fsl_gtm.h
fsl_lbc.h powerpc/fsl: Increase the number of possible localbus banks 2009-06-15 21:45:32 -05:00
fsldma.h fsldma: Add DMA_SLAVE support 2009-09-08 17:53:04 -07:00
ftrace.h
futex.h powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER 2010-02-17 14:03:15 +11:00
gpio.h powerpc/gpio: support gpio_to_irq() 2009-12-10 20:08:15 -06:00
grackle.h
hardirq.h powerpc: Convert global "BAD" interrupt to per cpu spurious 2010-02-17 14:02:49 +11:00
heathrow.h
highmem.h powerpc/mm: Make k(un)map_atomic out of line 2009-06-26 14:37:25 +10:00
hugetlb.h powerpc/mm: Bring hugepage PTE accessor functions back into sync with normal accessors 2009-10-30 17:21:23 +11:00
hvcall.h Merge commit 'origin/master' into next 2009-12-09 17:14:38 +11:00
hvconsole.h
hvcserver.h
hw_irq.h powerpc/perf_event: Fix oops due to perf_event_do_pending call 2010-05-12 14:34:00 +10:00
hydra.h
i8259.h
ibmebus.h
ide.h
immap_86xx.h
immap_cpm2.h powerpc/qe&cpm2: Avoid redefinitions in CPM2 and QE headers 2009-11-11 21:43:18 -06:00
immap_qe.h powerpc/qe&cpm2: Avoid redefinitions in CPM2 and QE headers 2009-11-11 21:43:18 -06:00
io-defs.h
io.h
ioctl.h
ioctls.h
iommu.h powerpc: Change archdata dma_data to a union 2009-09-24 15:31:43 +10:00
ipcbuf.h
ipic.h
irq.h powerpc: Make "intspec" pointers in irq_host->xlate() const 2009-12-09 17:10:37 +11:00
irq_regs.h
irqflags.h
Kbuild
kdebug.h
kdump.h
kexec.h
keylargo.h
kgdb.h
kmap_types.h powerpc: Fix DEBUG_HIGHMEM build break from d451564669 2009-12-01 09:33:45 +11:00
kprobes.h
kvm.h powerpc/kvm: Sync guest visible MMU state 2009-12-08 16:02:50 +11:00
kvm_44x.h
kvm_asm.h KVM: PPC: Implement 'skip instruction' mode 2010-03-01 12:35:48 -03:00
kvm_book3s.h KVM: PPC: Fix initial GPR settings 2010-03-01 12:35:55 -03:00
kvm_book3s_64_asm.h KVM: PPC: Call SLB patching code in interrupt safe manner 2010-03-01 12:35:49 -03:00
kvm_e500.h KVM: PPC E500: fix tlbcfg emulation 2010-03-01 12:36:06 -03:00
kvm_host.h KVM: ppc/booke: Set ESR and DEAR when inject interrupt to guest 2010-03-01 12:36:10 -03:00
kvm_para.h
kvm_ppc.h KVM: PPC: Fix initial GPR settings 2010-03-01 12:35:55 -03:00
libata-portmap.h
linkage.h
lmb.h
local.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2010-03-03 07:34:18 -08:00
lppaca.h powerpc/pseries: Add extended_cede_processor() helper function. 2009-11-24 14:33:03 +11:00
lv1call.h
machdep.h sysfs/cpu: Add probe/release files 2009-12-09 17:09:33 +11:00
macio.h powerpc/macio: Rework hotplug media bay support 2009-12-09 17:09:14 +11:00
mc146818rtc.h
mediabay.h powerpc/macio: Rework hotplug media bay support 2009-12-09 17:09:14 +11:00
mman.h mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions 2009-09-22 07:17:41 -07:00
mmu-8xx.h powerpc: Add TLB management code for 64-bit Book3E 2009-08-20 10:25:09 +10:00
mmu-40x.h powerpc: Add TLB management code for 64-bit Book3E 2009-08-20 10:25:09 +10:00
mmu-44x.h powerpc: Add TLB management code for 64-bit Book3E 2009-08-20 10:25:09 +10:00
mmu-book3e.h powerpc/booke: Move MMUCSR definition into mmu-book3e.h 2009-08-24 20:48:05 -05:00
mmu-hash32.h powerpc: Name xpn & x fields in HW Hash PTE format 2009-08-28 14:24:12 +10:00
mmu-hash64.h powerpc/mm: Fix pgtable cache cleanup with CONFIG_PPC_SUBPAGE_PROT 2009-12-08 15:59:33 +11:00
mmu.h powerpc/mm: Add MMU features for TLB reservation & Paired MAS registers 2009-08-28 14:24:12 +10:00
mmu_context.h Split init_new_context and destroy_context 2009-11-05 16:50:25 +11:00
mmzone.h
module.h module: handle ppc64 relocating kcrctabs when CONFIG_RELOCATABLE=y 2009-12-15 16:28:34 +10:30
mpc5xxx.h powerpc/5xxx: Add common mpc5xxx_get_bus_frequency() function 2009-06-17 00:30:22 -06:00
mpc6xx.h
mpc8xx.h
mpc52xx.h mpc52xx/wdt: merge WDT code into the GPT driver 2009-11-13 11:09:31 -07:00
mpc52xx_psc.h powerpc/mpc5121: enable support for more PSC UARTs 2010-02-16 22:30:04 -07:00
mpc5121.h powerpc/mpc5121: Add machine restart support 2010-02-16 10:36:26 -07:00
mpc8260.h
mpic.h powerpc: Convert mpic locks to raw_spinlock 2010-02-19 14:52:32 +11:00
msgbuf.h
msi_bitmap.h
mutex.h powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER 2010-02-17 14:03:15 +11:00
nvram.h powerpc/nvram_64: Remove unused code 2009-10-30 17:21:28 +11:00
of_device.h
of_platform.h of: make of_(un)register_platform_driver common code 2009-05-02 15:36:10 -07:00
ohare.h
oprofile_impl.h
paca.h powerpc: Dynamically allocate pacas 2010-03-09 11:52:52 +11:00
page.h powerpc/fsl-booke: Fix CONFIG_RELOCATABLE support on FSL Book-E ppc32 2010-04-26 17:54:15 -05:00
page_32.h asm-generic: rename page.h and uaccess.h 2009-06-11 21:02:17 +02:00
page_64.h powerpc/mm: Cleanup initialization of hugepages on powerpc 2009-10-30 17:20:58 +11:00
param.h powerpc: Simplify param.h by including <asm-generic/param.h> 2010-02-03 17:39:48 +11:00
parport.h parport_pc: Fix build failure drivers/parport/parport_pc.c for powerpc 2009-04-14 08:48:50 -07:00
pasemi_dma.h
pci-bridge.h powerpc/pci: Pull ppc32 PCI features into common 2009-08-28 14:24:15 +10:00
pci.h pci-dma: add linux/pci-dma.h to linux/pci.h 2010-03-12 15:52:42 -08:00
percpu.h
perf_event.h powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
perf_event_fsl_emb.h powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
perf_event_server.h powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
pgalloc-32.h powerpc/mm: Cleanup management of kmem_caches for pagetables 2009-10-30 17:20:57 +11:00
pgalloc-64.h powerpc/mm: Fix pgtable cache cleanup with CONFIG_PPC_SUBPAGE_PROT 2009-12-08 15:59:33 +11:00
pgalloc.h powerpc/mm: Cleanup management of kmem_caches for pagetables 2009-10-30 17:20:57 +11:00
pgtable-ppc32.h powerpc/fsl-booke: Use HW PTE format if CONFIG_PTE_64BIT 2009-09-02 16:20:41 +10:00
pgtable-ppc64-4k.h
pgtable-ppc64-64k.h powerpc/mm: Fix misplaced #endif in pgtable-ppc64-64k.h 2009-08-20 10:12:35 +10:00
pgtable-ppc64.h powerpc/mm: Allow more flexible layouts for hugepage pagetables 2009-10-30 17:20:58 +11:00
pgtable.h MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself 2010-02-20 16:41:46 +00:00
phyp_dump.h
pmac_feature.h powerpc: Convert feature_lock to raw_spinlock 2010-02-19 14:52:32 +11:00
pmac_low_i2c.h i2c-powermac: Include the i2c_adapter in struct pmac_i2c_bus 2009-12-06 17:06:19 +01:00
pmac_pfunc.h
pmc.h powerpc/pmc: Don't access lppaca on Book3E 2009-09-24 15:31:39 +10:00
pmi.h
poll.h
posix_types.h
ppc-opcode.h powerpc/85xx: Make sure lwarx hint isn't set on ppc32 2010-03-16 23:24:06 -05:00
ppc-pci.h powerpc/eeh: Fix a bug when pci structure is null 2010-02-17 14:02:47 +11:00
ppc4xx.h
ppc_asm.h powerpc: Adjust base and index registers in Altivec macros 2009-08-28 14:24:12 +10:00
processor.h powerpc/booke: Add definitions for advanced debug registers 2010-02-17 14:03:17 +11:00
prom.h of: remove undefined request_OF_resource & release_OF_resource 2010-02-14 13:02:45 -07:00
ps3.h ps3: Replace direct file operations by callback 2009-06-15 16:47:26 +10:00
ps3av.h
ps3fb.h powerpc: Remove duplicated #include's 2009-04-07 15:18:58 +10:00
ps3gpu.h ps3fb: Tear down FB setup during cleanup 2009-06-15 13:26:21 +10:00
ps3stor.h
pSeries_reconfig.h powerpc/pseries: Kernel DLPAR Infrastructure 2009-12-09 17:09:32 +11:00
pte-8xx.h powerpc/8xx: Restore _PAGE_WRITETHRU 2009-12-09 17:10:37 +11:00
pte-40x.h powerpc/mm: Fix 40x and 8xx vs. _PAGE_SPECIAL 2009-09-24 15:31:49 +10:00
pte-44x.h powerpc/mm: Cleanup handling of execute permission 2009-08-27 13:12:51 +10:00
pte-book3e.h powerpc/fsl-booke: Use HW PTE format if CONFIG_PTE_64BIT 2009-09-02 16:20:41 +10:00
pte-common.h powerpc/mm: Fix 40x and 8xx vs. _PAGE_SPECIAL 2009-09-24 15:31:49 +10:00
pte-fsl-booke.h powerpc/fsl-booke: Use HW PTE format if CONFIG_PTE_64BIT 2009-09-02 16:20:41 +10:00
pte-hash32.h powerpc/mm: Cleanup handling of execute permission 2009-08-27 13:12:51 +10:00
pte-hash64-4k.h
pte-hash64-64k.h powerpc/mm: Fix pgtable cache cleanup with CONFIG_PPC_SUBPAGE_PROT 2009-12-08 15:59:33 +11:00
pte-hash64.h
ptrace.h ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h 2010-03-12 15:52:38 -08:00
qe.h powerpc/qe&cpm: Implement static inline stubs for non-QE/CPM builds 2009-11-11 21:43:20 -06:00
qe_ic.h
reg.h KVM: PPC: Emulate trap SRR1 flags properly 2010-03-01 12:35:49 -03:00
reg_8xx.h
reg_booke.h powerpc/booke: Fix a couple typos in the advanced ptrace code 2010-03-09 11:54:18 +11:00
reg_fsl_emb.h powerpc/perf: e500 support 2010-03-05 03:04:08 -06:00
resource.h
rheap.h
rio.h
rtas.h locking: Convert raw_spinlock to arch_spinlock 2009-12-14 23:55:32 +01:00
rtc.h
rwsem.h
scatterlist.h powerpc: Use sg->dma_length in sg_dma_len() macro on 32-bit 2009-05-21 15:44:25 +10:00
seccomp.h
sections.h
sembuf.h
serial.h
setjmp.h
setup.h powerpc: derive COMMAND_LINE_SIZE from asm-generic 2009-08-28 14:24:16 +10:00
sfp-machine.h powerpc/math-emu: Change types to work on ppc64 2009-04-02 16:17:36 -05:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
smp.h percpu: make percpu symbols in powerpc unique 2009-10-29 22:34:14 +09:00
smu.h
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h
sparsemem.h
spinlock.h powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER 2010-02-17 14:03:15 +11:00
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
spu.h
spu_csa.h
spu_info.h
spu_priv1.h
sstep.h
stat.h
statfs.h
string.h
suspend.h pm: cleanup includes 2009-04-01 08:59:16 -07:00
swab.h
swiotlb.h powerpc: use dma_map_ops struct 2009-08-28 14:24:10 +10:00
synch.h powerpc: Use lwsync for acquire barrier if CPU supports it 2010-02-17 14:03:16 +11:00
syscall.h powerpc: Use correct ccr bit for syscall error status 2010-03-19 16:38:16 +11:00
syscalls.h improve sys_newuname() for compat architectures 2010-03-12 15:52:32 -08:00
systbl.h improve sys_newuname() for compat architectures 2010-03-12 15:52:32 -08:00
system.h powerpc/booke: Add support for advanced debug registers 2010-02-17 14:03:17 +11:00
tce.h
termbits.h
termios.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
thread_info.h powerpc: TIF_ABI_PENDING bit removal 2010-02-01 14:00:30 +11:00
time.h
timex.h
tlb.h powerpc/mm: Rework & cleanup page table freeing code path 2009-08-20 10:24:56 +10:00
tlbflush.h powerpc/mm: Make low level TLB flush ops on BookE take additional args 2009-08-20 10:12:41 +10:00
topology.h powerpc: Reformat SD_NODE_INIT to match x86 2010-02-09 13:56:07 +11:00
trace.h powerpc: tracing: Give hypervisor call tracepoints access to arguments 2009-10-28 16:13:04 +11:00
tsi108.h
tsi108_irq.h
tsi108_pci.h
types.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
uaccess.h
ucc.h
ucc_fast.h
ucc_slow.h
ucontext.h
udbg.h powerpc: gamecube/wii: early debugging using usbgecko 2009-12-12 22:24:31 -07:00
uic.h
unaligned.h
uninorth.h
unistd.h Add generic sys_olduname() 2010-03-12 15:52:32 -08:00
user.h
vdso.h powerpc: Move 64bit VDSO to improve context switch performance 2009-08-20 10:12:24 +10:00
vdso_datapage.h
vga.h
vio.h
xilinx_intc.h
xilinx_pci.h powerpc/virtex: Add support for Xilinx PCI host bridge 2009-06-06 10:14:22 -06:00
xmon.h
xor.h