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1ee55a8f7f
linux/arch/arc/kernel
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Jose Abreu 1ee55a8f7f ARC: Re-enable MMU upon Machine Check exception 
I recently came upon a scenario where I would get a double fault
machine check exception tiriggered by a kernel module.
However the ensuing crash stacktrace (ksym lookup) was not working
correctly.

Turns out that machine check auto-disables MMU while modules are allocated
in kernel vaddr spapce.

This patch re-enables the MMU before start printing the stacktrace
making stacktracing of modules work upon a fatal exception.

Cc: stable@kernel.org
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Reviewed-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: moved code into low level handler to avoid in 2 places]
2017-09-01 11:29:05 -07:00
..
.gitignore ARC: Add some .gitignore entries 2013-08-26 09:40:24 +05:30
arc_hostlink.c ARC: Hostlink Pseudo-Driver for Metaware Debugger 2013-02-15 23:16:10 +05:30
arcksyms.c ARC: export __udivdi3 for modules 2016-08-19 14:09:33 -07:00
asm-offsets.c ARCv2: [vdk] dts files and defconfig for HS38 VDK 2015-06-25 06:00:21 +05:30
ctx_sw_asm.S ARC: dw2 unwind: enable cfi pseudo ops in string lib 2016-09-30 14:48:22 -07:00
ctx_sw.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
devtree.c ARC: [plat-hsdk] initial port for HSDK board 2017-09-01 11:26:28 -07:00
disasm.c ARC: rename kconfig option for unaligned emulation 2014-10-13 14:46:15 +05:30
entry-arcv2.S ARCv2: make unimplemented vectors as no-ops rather than halt core 2017-03-20 18:47:57 -07:00
entry-compact.S ARC: typos fix in kernel/entry-compact.S 2017-08-28 15:17:36 -07:00
entry.S ARC: Re-enable MMU upon Machine Check exception 2017-09-01 11:29:05 -07:00
fpu.c ARC: Process-creation/scheduling/idle-loop 2013-02-11 20:00:38 +05:30
head.S ARC: smp-boot: Decouple Non masters waiting API from jump to entry point 2017-01-24 11:12:28 -08:00
intc-arcv2.c arc: Mask individual IRQ lines during core INTC init 2017-08-11 06:38:31 +05:30
intc-compact.c arc: Mask individual IRQ lines during core INTC init 2017-08-11 06:38:31 +05:30
irq.c ARC: [intc-*] Do a domain lookup in primary handler for hwirq -> linux virq 2016-05-09 09:32:30 +05:30
kgdb.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
kprobes.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-11-15 16:47:22 -08:00
Makefile clocksource: import ARC timer driver 2016-11-30 11:54:25 -08:00
mcip.c ARCv2: IDU-intc: Delete deprecated parameters in Device Trees 2017-02-06 09:37:57 -08:00
module.c ARC: module: Fix !CONFIG_ARC_DW2_UNWIND builds 2017-01-18 11:17:44 -08:00
pcibios.c ARC: Add PCI support 2016-03-10 14:44:13 -06:00
perf_event.c arc: perf: Enable generic "cache-references" and "cache-misses" events 2016-09-30 14:48:18 -07:00
process.c ARC: [plat-eznps] handle extra aux regs #2: kernel/entry exit 2017-08-28 15:17:36 -07:00
ptrace.c ARCv2: ptrace: provide regset for accumulator/r30 regs 2017-05-03 11:21:31 -07:00
reset.c arc: export symbol for pm_power_off in reset.c 2013-11-06 10:41:44 +05:30
setup.c ARC: set boot print log level to PR_INFO 2017-08-28 15:17:36 -07:00
signal.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
smp.c sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
stacktrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
sys.c ARC: ABIv3: fork/vfork wrappers not needed in "no-legacy-syscall" ABI 2013-03-11 19:01:10 +05:30
traps.c ARC: Show fault information passed to show_kernel_fault_diag() 2017-09-01 11:26:29 -07:00
troubleshoot.c ARC: Show fault information passed to show_kernel_fault_diag() 2017-09-01 11:26:29 -07:00
unaligned.c ARC: [arcompact] brown paper bag bug in unaligned access delay slot fixup 2017-02-07 10:02:01 -08:00
unwind.c scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
vmlinux.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00