David Ahern c17af4dd96 sparc: perf: Disable pagefaults while walking userspace stacks ...

Page faults generated walking userspace stacks can call schedule to switch
out the task. When collecting callchains for scheduler tracepoints this
causes a deadlock as the tracepoints can be hit with the runqueue lock held:

[ 8138.159054] WARNING: CPU: 758 PID: 12488 at /opt/dahern/linux.git/arch/sparc/kernel/nmi.c:80 perfctr_irq+0x1f8/0x2b4()

[ 8138.203152] Watchdog detected hard LOCKUP on cpu 758

[ 8138.410969] CPU: 758 PID: 12488 Comm: perf Not tainted 4.0.0-rc6+ #6
[ 8138.437146] Call Trace:
[ 8138.447193]  [000000000045cdd4] warn_slowpath_common+0x7c/0xa0
[ 8138.471238]  [000000000045ce90] warn_slowpath_fmt+0x30/0x40
[ 8138.494189]  [0000000000983e38] perfctr_irq+0x1f8/0x2b4
[ 8138.515716]  [00000000004209f4] tl0_irq15+0x14/0x20
[ 8138.535791]  [00000000009839ec] _raw_spin_trylock_bh+0x68/0x108
[ 8138.560180]  [0000000000980018] __schedule+0xcc/0x710
[ 8138.580981]  [00000000009806dc] preempt_schedule_common+0x10/0x3c
[ 8138.606082]  [000000000098077c] _cond_resched+0x34/0x44
[ 8138.627603]  [0000000000565990] kmem_cache_alloc_node+0x24/0x1a0
[ 8138.652345]  [0000000000450b60] tsb_grow+0xac/0x488
[ 8138.672429]  [0000000000985040] do_sparc64_fault+0x4dc/0x6e4
[ 8138.695736]  [0000000000407c2c] sparc64_realfault_common+0x10/0x20
[ 8138.721202]  [00000000006f2e24] NG4copy_from_user+0xa4/0x3c0
[ 8138.744510]  [000000000044f900] perf_callchain_user+0x5c/0x6c
[ 8138.768182]  [0000000000517b5c] perf_callchain+0x16c/0x19c
[ 8138.790774]  [0000000000515f84] perf_prepare_sample+0x68/0x218
[ 8138.814801] ---[ end trace 42ca6294b1ff7573 ]---

As with PowerPC (b59a1bfcc240, "powerpc/perf: Disable pagefaults during
callchain stack read") disable pagefaults while walking userspace stacks.

Signed-off-by: David Ahern <david.ahern@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2015-06-25 06:01:02 -07:00

..

.gitignore

…

apc.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

asm-offsets.c

[PATCH] sparc32: vm_area_struct access for old Sun SPARCs.

2013-07-10 13:56:10 -07:00

audit.c

sparc64: fix sparse warnings in compat_audit.c

2014-05-18 19:01:34 -07:00

auxio_32.c

sparc32: fix sparse warning in auxio_32.c

2014-05-18 19:01:27 -07:00

auxio_64.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

btext.c

sparc64: fix sparse warning in btext.c

2014-05-18 19:01:30 -07:00

central.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

cherrs.S

…

chmc.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

compat_audit.c

sparc64: fix sparse warnings in compat_audit.c

2014-05-18 19:01:34 -07:00

cpu.c

sparc64: correctly recognise M6 and M7 cpu type

2014-09-09 15:24:10 -07:00

cpumap.c

sparc64: support M6 and M7 for building CPU distribution map

2014-09-09 15:24:10 -07:00

cpumap.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

devices.c

sparc32: drop tadpole specific code

2014-05-18 19:01:29 -07:00

dma.c

…

ds.c

sparc64: Move request_irq() from ldc_bind() to ldc_alloc()

2014-09-16 18:31:31 -07:00

dtlb_miss.S

…

dtlb_prot.S

sparc64: Fix corrupted thread fault code.

2014-10-18 23:03:09 -04:00

ebus.c

sparc: delete non-required instances of include <linux/init.h>

2014-01-28 23:38:23 -08:00

entry.h

sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

2015-05-31 22:15:01 -07:00

entry.S

sparc32: Fix exit flag passed from traced sys_sigreturn

2013-07-31 19:10:04 -07:00

etrap_32.S

…

etrap_64.S

…

fpu_traps.S

…

ftrace.c

ftrace: Do not pass data to ftrace_dyn_arch_init

2014-03-07 10:06:14 -05:00

getsetcc.S

…

head_32.S

…

head_64.S

sparc64: Fix register corruption in top-most kernel stack frame during boot.

2014-10-24 09:52:49 -07:00

helpers.S

…

hvapi.c

sparc: perf: Add support M7 processor

2015-03-19 18:54:49 -07:00

hvcalls.S

sparc: perf: Add support M7 processor

2015-03-19 18:54:49 -07:00

hvtramp.S

sparc64: Fix register corruption in top-most kernel stack frame during boot.

2014-10-24 09:52:49 -07:00

idprom.c

…

iommu_common.h

sparc: Make sparc64 use scalable lib/iommu-common.c functions

2015-04-18 12:32:59 -07:00

iommu.c

sparc: Make sparc64 use scalable lib/iommu-common.c functions

2015-04-18 12:32:59 -07:00

ioport.c

sparc32: dma_alloc_coherent must honour gfp flags

2014-09-10 14:03:28 -07:00

irq_32.c

sparc32: fix sparse warnings in irq_32.c

2014-04-29 01:12:25 -04:00

irq_64.c

sparc64: sparse irq

2014-10-05 16:53:40 -07:00

irq.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

itlb_miss.S

…

ivec.S

…

jump_label.c

…

kernel.h

sparc64: fix sparse warning in kgdb_64.c

2014-05-18 19:01:34 -07:00

kgdb_32.c

sparc: explicitly include sched.h to get task_thread_info declaration

2013-02-06 11:04:10 -08:00

kgdb_64.c

sparc64: fix sparse warning in kgdb_64.c

2014-05-18 19:01:34 -07:00

kprobes.c

sparc: Replace __get_cpu_var uses

2014-08-26 13:45:55 -04:00

kstack.h

…

ktlb.S

sparc64: Adjust vmalloc region size based upon available virtual address bits.

2014-10-05 16:53:40 -07:00

ldc.c

sparc: use for_each_sg()

2015-06-24 17:49:40 -07:00

led.c

…

leon_kernel.c

sparc: leon: Fix race condition between leon_cycles_offset and timer_interrupt

2014-09-09 16:39:10 -07:00

leon_pci_grpci1.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

leon_pci_grpci2.c

sparc: kernel: GRPCI2: Remove a useless memset

2015-05-31 22:14:05 -07:00

leon_pci.c

PCI: Cleanup control flow

2015-03-19 10:17:22 -05:00

leon_pmc.c

sparc32: fix sparse warnings in leon_pmc.c

2014-04-29 01:12:27 -04:00

leon_smp.c

sparc32, leon: Align ccall_info to prevent unaligned traps on crosscall

2014-12-11 18:51:56 -08:00

Makefile

sparc32: drop tadpole specific code

2014-05-18 19:01:29 -07:00

mdesc.c

sparc64: Setup sysfs to mark LDOM sockets, cores and threads correctly

2015-04-22 15:42:56 -04:00

misctrap.S

…

module.c

mm: vmalloc: pass additional vm_flags to __vmalloc_node_range()

2015-02-13 21:21:42 -08:00

nmi.c

sparc: Replace __get_cpu_var uses

2014-08-26 13:45:55 -04:00

of_device_32.c

…

of_device_64.c

…

of_device_common.c

sparc: fix sparse warnings in of_device_common.c

2014-04-29 01:12:27 -04:00

of_device_common.h

…

pci_common.c

sparc: delete non-required instances of include <linux/init.h>

2014-01-28 23:38:23 -08:00

pci_fire.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

pci_impl.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

pci_msi.c

PCI/MSI: Rename mask/unmask_msi_irq treewide

2014-11-23 13:01:45 +01:00

pci_psycho.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

pci_sabre.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

pci_schizo.c

Driver core patches for 3.19-rc1

2014-12-14 16:10:09 -08:00

pci_sun4v_asm.S

…

pci_sun4v.c

sparc: Make sparc64 use scalable lib/iommu-common.c functions

2015-04-18 12:32:59 -07:00

pci_sun4v.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

pci.c

sparc64: pci slots information is not populated in sysfs

2015-05-31 22:14:40 -07:00

pcic.c

PCI: Assign resources before drivers claim devices (pci_scan_bus())

2015-03-12 15:04:01 -05:00

pcr.c

sparc: perf: Add support M7 processor

2015-03-19 18:54:49 -07:00

perf_event.c

sparc: perf: Disable pagefaults while walking userspace stacks

2015-06-25 06:01:02 -07:00

pmc.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

power.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

process_32.c

sparc32: fix sparse warning in auxio_32.c

2014-05-18 19:01:27 -07:00

process_64.c

sparc: Touch NMI watchdog when walking cpus and calling printk

2015-03-19 18:54:50 -07:00

prom_32.c

…

prom_64.c

sparc64: fix sparse warning in prom_64.c

2014-05-18 19:01:31 -07:00

prom_common.c

of: Fix locking vs. interrupts

2013-06-13 22:12:14 +01:00

prom_irqtrans.c

…

prom.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

psycho_common.c

…

psycho_common.h

sparc: drop use of extern for prototypes in arch/sparc/*

2014-05-18 19:01:29 -07:00

ptrace_32.c

sparc32: fix sparse warning in ptrace_32.c

2014-04-29 01:12:26 -04:00

ptrace_64.c

ARCH: AUDIT: audit_syscall_entry() should not require the arch

2014-09-23 16:21:26 -04:00

reboot.c

…

rtrap_32.S

…

rtrap_64.S

Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-11-19 10:40:00 -08:00

sbus.c

sparc: kernel/sbus.c: fix memory leakage

2013-01-21 14:33:00 -08:00

setup_32.c

sparc32: fix sparse warnings in setup_32.c

2014-04-29 01:12:25 -04:00

setup_64.c

sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

2015-05-31 22:15:01 -07:00

signal32.c

all arches, signal: move restart_block to struct task_struct

2015-02-12 18:54:12 -08:00

signal_32.c

all arches, signal: move restart_block to struct task_struct

2015-02-12 18:54:12 -08:00

signal_64.c

all arches, signal: move restart_block to struct task_struct

2015-02-12 18:54:12 -08:00

sigutil_32.c

…

sigutil_64.c

…

sigutil.h

…

smp_32.c

sparc: fix decimal printf format specifiers prefixed with 0x

2014-08-06 14:41:10 -07:00

smp_64.c

sparc64: Setup sysfs to mark LDOM sockets, cores and threads correctly

2015-04-22 15:42:56 -04:00

sparc_ksyms_32.c

sparc: delete non-required instances of include <linux/init.h>

2014-01-28 23:38:23 -08:00

sparc_ksyms_64.c

sparc: delete non-required instances of include <linux/init.h>

2014-01-28 23:38:23 -08:00

spiterrs.S

…

sstate.c

…

stacktrace.c

…

starfire.c

arch: sparc: kernel: starfire.c: Remove unused function

2015-03-01 21:33:58 -08:00

sun4d_irq.c

sparc32: fix sparse warnings in sun4d_irq.c

2014-04-29 01:12:25 -04:00

sun4d_smp.c

sparc: Replace __get_cpu_var uses

2014-08-26 13:45:55 -04:00

sun4m_irq.c

sun4M: add include of slab.h for kzalloc

2014-02-12 16:10:45 -05:00

sun4m_smp.c

sparc: delete __cpuinit/__CPUINIT usage from all users

2013-07-14 19:36:52 -04:00

sun4v_ivec.S

…

sun4v_tlb_miss.S

sparc64: sun4v TLB error power off events

2014-09-16 17:46:44 -07:00

sys32.S

sparc: Hook up renameat2 syscall.

2014-07-21 22:27:56 -07:00

sys_sparc32.c

sparc64: fix sparse warnings in sys_sparc32.c

2014-05-18 19:01:31 -07:00

sys_sparc_32.c

sparc32: fix sparse warnings in sys_sparc_32.c

2014-05-18 19:01:28 -07:00

sys_sparc_64.c

sparc: semtimedop() unreachable due to comparison error

2015-03-03 14:05:48 -08:00

syscalls.S

sparc: hook up execveat system call

2014-12-13 12:42:51 -08:00

sysfs.c

sparc64: fix format string mismatch in arch/sparc/kernel/sysfs.c

2014-05-21 12:54:42 -07:00

systbls_32.S

sparc: hook up execveat system call

2014-12-13 12:42:51 -08:00

systbls_64.S

sparc: hook up execveat system call

2014-12-13 12:42:51 -08:00

systbls.h

sparc64: fix sparse warnings in sys_sparc32.c

2014-05-18 19:01:31 -07:00

time_32.c

This is the final removal (after several years!) of the obsolete cpus_*

2015-04-20 10:19:03 -07:00

time_64.c

sparc: kernel: drop owner assignment from platform_drivers

2014-10-20 16:20:15 +02:00

trampoline_32.S

sparc: delete non-required instances of include <linux/init.h>

2014-01-28 23:38:23 -08:00

trampoline_64.S

sparc64: Fix register corruption in top-most kernel stack frame during boot.

2014-10-24 09:52:49 -07:00

traps_32.c

sparc: Remove signal translation and exec_domain

2015-04-12 21:03:21 +02:00

traps_64.c

sparc: Remove signal translation and exec_domain

2015-04-12 21:03:21 +02:00

tsb.S

sparc64: Fix corrupted thread fault code.

2014-10-18 23:03:09 -04:00

ttable_32.S

…

ttable_64.S

…

una_asm_32.S

…

una_asm_64.S

…

unaligned_32.c

sparc: use %s for unaligned panic

2014-07-21 21:37:06 -07:00

unaligned_64.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next

2014-06-19 07:50:07 -10:00

utrap.S

…

vio.c

sparc64: Add vio_set_intr() to enable/disable Rx interrupts

2014-09-30 14:40:45 -07:00

viohs.c

sparc: VIO protocol version 1.6

2014-09-30 14:17:08 -07:00

visemul.c

…

vmlinux.lds.S

sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

2015-05-31 22:15:01 -07:00

windows.c

sparc32: fix sparse warnings in windows.c

2014-04-29 01:12:25 -04:00

winfixup.S

…

wof.S

…

wuf.S

…