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0768330d46
linux/arch/arm/kernel
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Daniel Thompson 0768330d46 ARM: 8439/1: Fix backtrace generation when IPI is masked 
Currently on ARM when <SysRq-L> is triggered from an interrupt handler
(e.g. a SysRq issued using UART or kbd) the main CPU will wedge for ten
seconds with interrupts masked before issuing a backtrace for every CPU
except itself.

The new backtrace code introduced by commit 96f0e00378 ("ARM: add
basic support for on-demand backtrace of other CPUs") does not work
correctly when run from an interrupt handler because IPI_CPU_BACKTRACE
is used to generate the backtrace on all CPUs but cannot preempt the
current calling context.

This can be fixed by detecting that the calling context cannot be
preempted and issuing the backtrace directly in this case. Issuing
directly leaves us without any pt_regs to pass to nmi_cpu_backtrace()
so we also modify the generic code to call dump_stack() when its
argument is NULL.

Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-10-03 16:40:51 +01:00
..
.gitignore
arch_timer.c arch_timer: Move to generic sched_clock framework 2013-10-09 16:54:10 -07:00
armksyms.c Merge branch 'uaccess' into fixes 2015-09-11 19:18:28 +01:00
asm-offsets.c Merge branch 'exec_domain_rip_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc 2015-04-15 13:53:55 -07:00
atags_compat.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags_parse.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags_proc.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags.h ARM: constify machine_desc structure uses 2013-07-26 14:55:59 +01:00
bios32.c ARM/PCI: Remove msi_controller from struct pci_sys_data 2015-08-20 12:02:50 -05:00
calls.S ARM: wire up execveat syscall 2015-01-07 20:31:54 +00:00
cpuidle.c ARM: cpuidle: Document the code 2015-03-25 09:53:43 +01:00
crash_dump.c ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr 2014-04-07 12:10:00 +01:00
debug.S ARM: unify MMU/!MMU addruart calls 2015-05-20 23:09:51 +02:00
devtree.c arm: Add devicetree fixup machine function 2014-07-29 21:26:49 -06:00
dma-isa.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
dma.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
early_printk.c early_printk: consolidate random copies of identical code 2013-04-29 18:28:13 -07:00
elf.c
entry-armv.S ARM: remove user cmpxchg syscall 2015-10-03 16:36:45 +01:00
entry-common.S Merge branch 'uaccess' into fixes 2015-09-11 19:18:28 +01:00
entry-ftrace.S ARM: replace BSYM() with badr assembly macro 2015-05-08 17:33:50 +01:00
entry-header.S ARM: entry: provide uaccess assembly macro hooks 2015-08-26 20:27:02 +01:00
entry-v7m.S ARM: 8340/1: ARMv7-M: Enlarge vector table up to 256 entries 2015-05-08 10:42:21 +01:00
fiq.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
fiqasm.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ftrace.c ARM: kprobes: enable OPTPROBES for ARM 32 2015-01-13 16:10:17 +00:00
head-common.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
head-nommu.S ARM: 8383/1: nommu: avoid deprecated source register on mov 2015-06-12 21:18:48 +01:00
head.S Merge branch 'uaccess' into fixes 2015-09-11 19:18:28 +01:00
hibernate.c ARM: move reboot code to arch/arm/kernel/reboot.c 2015-04-02 09:50:45 +01:00
hw_breakpoint.c ARM: 8436/1: hw_breakpoint: remove unnecessary header 2015-10-03 16:36:44 +01:00
hyp-stub.S Here are the PPC and ARM changes for KVM, which I separated because 2014-08-07 11:35:30 -07:00
insn.c
io.c ARM: io.c: clean up EXPORT_SYMBOL()s 2014-11-21 15:25:02 +00:00
irq.c ARM: Remove ununsed set_irq_flags 2015-09-16 16:53:39 +02:00
isa.c arm: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
iwmmxt.S ARM: 8221/1: PJ4: allow building in Thumb-2 mode 2014-12-03 16:08:00 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c ARM: 8428/1: kgdb: Fix registers on sleeping tasks 2015-10-03 16:36:45 +01:00
machine_kexec.c ARM: 8338/1: kexec: Relax SMP validation to improve DT compatibility 2015-04-02 09:59:43 +01:00
Makefile Merge branch 'psci/for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux into devel-stable 2015-08-10 15:57:44 +01:00
module-plts.c ARM: 8364/1: fix BE32 module loading 2015-06-02 09:58:17 +01:00
module.c ARM: 8220/1: allow modules outside of bl range 2015-05-08 10:42:34 +01:00
module.lds ARM: 8220/1: allow modules outside of bl range 2015-05-08 10:42:34 +01:00
opcodes.c
patch.c ARM: probes: move all probe code to dedicate directory 2015-01-09 09:36:50 +00:00
perf_callchain.c arm: perf: factor out callchain code 2014-10-30 12:16:58 +00:00
perf_event_v6.c arm: perf: factor arm_pmu core out to drivers 2015-07-31 15:01:14 +01:00
perf_event_v7.c arm: perf: factor arm_pmu core out to drivers 2015-07-31 15:01:14 +01:00
perf_event_xscale.c arm: perf: factor arm_pmu core out to drivers 2015-07-31 15:01:14 +01:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
pj4-cp0.c ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 2014-04-25 12:07:34 +01:00
process.c Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-14 12:24:10 -07:00
psci_smp.c ARM: migrate to common PSCI client code 2015-08-03 15:38:39 +01:00
psci-call.S ARM: 8307/1: psci: move psci firmware calls out of line 2015-03-29 23:11:17 +01:00
ptrace.c Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
reboot.c ARM: 8400/1: use virt_to_idmap to get phys_reset address 2015-07-17 15:08:17 +01:00
reboot.h ARM: move reboot code to arch/arm/kernel/reboot.c 2015-04-02 09:50:45 +01:00
relocate_kernel.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
return_address.c ARM: 8328/1: remove empty preprocessor #else branch 2015-03-28 16:54:53 +00:00
setup.c Merge branch 'devel-stable' into for-linus 2015-09-03 15:28:50 +01:00
signal.c Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-19 21:05:02 -07:00
sigreturn_codes.S ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 2013-11-30 22:21:00 +00:00
sleep.S ARM: fix new BSYM() usage introduced via for-arm-soc branch 2015-06-12 21:19:35 +01:00
smp_scu.c ARM: 8122/1: smp_scu: enable SCU standby support 2014-08-02 08:51:53 +01:00
smp_tlb.c ARM: 8111/1: Enable erratum 798181 for Broadcom Brahma-B15 2014-07-24 14:40:26 +01:00
smp_twd.c ARM: 8434/2: Revert "7655/1: smp_twd: make twd_local_timer_of_register() no-op for nosmp" 2015-10-03 16:36:44 +01:00
smp.c ARM: 8439/1: Fix backtrace generation when IPI is masked 2015-10-03 16:40:51 +01:00
stacktrace.c ARM: 8172/1: Use current_stack_pointer in save_stack_trace_tsk 2014-11-13 23:58:03 +00:00
suspend.c ARM: 8248/1: pm: remove outdated comment 2015-01-21 15:58:57 +00:00
swp_emulate.c ARM: software-based priviledged-no-access support 2015-08-26 20:34:24 +01:00
sys_arm.c
sys_oabi-compat.c separate kernel- and userland-side msghdr 2014-11-19 16:22:59 -05:00
tcm.c ARM: 8388/1: tcm: Don't crash when TCM banks are protected by TrustZone 2015-06-06 10:37:28 +01:00
thumbee.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
time.c ARM, clocksource/drivers: Provide read_boot_clock64() and read_persistent_clock64() and use them 2015-04-03 08:18:23 +02:00
topology.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
traps.c ARM: remove user cmpxchg syscall 2015-10-03 16:36:45 +01:00
unwind.c ARM: 8176/1: Use current_stack_pointer in unwind_backtrace 2014-11-13 23:58:09 +00:00
v7m.c ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines 2013-09-02 13:49:29 +01:00
vdso.c ARM: 8410/1: VDSO: fix coarse clock monotonicity regression 2015-08-11 13:42:44 +01:00
vmlinux.lds.S arm64 updates for 4.1: 2015-04-16 13:58:29 -05:00
xscale-cp0.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00