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android_kernel_oneplus_msm8998/arch/arc/kernel
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Jose Abreu 81306fc3db ARC: Re-enable MMU upon Machine Check exception 
commit 1ee55a8f7f6b7ca4c0c59e0b4b4e3584a085c2d3 upstream.

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.

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]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-09-27 11:00:16 +02:00
..
.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: Build system: Makefiles, Kconfig, Linker script 2013-02-11 20:00:25 +05:30
asm-offsets.c ARCv2: [vdk] dts files and defconfig for HS38 VDK 2015-06-25 06:00:21 +05:30
clk.c ARC: fix typo with clock speed 2013-05-07 13:43:54 +05:30
ctx_sw.c ARC: remove SYNC from __switch_to() 2015-11-17 22:05:30 +05:30
ctx_sw_asm.S ARC: remove SYNC from __switch_to() 2015-11-17 22:05:30 +05:30
devtree.c ARCv2: [axs103] Support ARC SDP FPGA platform for HS38x cores 2015-06-25 06:00:20 +05:30
disasm.c ARC: rename kconfig option for unaligned emulation 2014-10-13 14:46:15 +05:30
entry-arcv2.S ARCv2: SMP: Emulate IPI to self using software triggered interrupt 2016-03-03 15:07:28 -08:00
entry-compact.S ARC: [arcompact] Handle bus error from userspace as Interrupt not exception 2015-11-14 13:12:20 +05:30
entry.S ARC: Re-enable MMU upon Machine Check exception 2017-09-27 11:00:16 +02:00
fpu.c ARC: Process-creation/scheduling/idle-loop 2013-02-11 20:00:38 +05:30
head.S ARC: boot: Non Master cpus only need to call EARLY_CPU_SETUP once 2015-10-28 16:13:42 +05:30
intc-arcv2.c ARCv2: intc: Fix random perf irq disabling in SMP setup 2015-12-12 16:03:41 +05:30
intc-compact.c ARC: smp: irqchip: handle IPI as percpu irq like timer 2015-10-28 16:13:39 +05:30
irq.c ARC: smp: Rename platform hook @init_cpu_smp -> @init_per_cpu 2015-12-17 12:56:56 +05:30
kgdb.c ARC: kgdb: generic kgdb_arch_pc() suffices 2014-10-22 16:14:04 -06:00
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 ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et al 2015-06-22 14:06:56 +05:30
mcip.c ARCv2: SMP: Emulate IPI to self using software triggered interrupt 2016-03-03 15:07:28 -08:00
module.c ARC: Fix coding style issues 2013-04-09 12:21:14 +05:30
perf_event.c ARCv2: perf: Ensure perf intr gets enabled on all cores 2015-12-12 16:03:59 +05:30
process.c ARC: Abstract out ISA specific SLEEP args 2015-11-16 14:17:02 +05:30
ptrace.c ARCv2: Support for ARCv2 ISA and HS38x cores 2015-06-22 14:06:55 +05:30
reset.c arc: export symbol for pm_power_off in reset.c 2013-11-06 10:41:44 +05:30
setup.c ARCv2: LLSC: software backoff is NOT needed starting HS2.1c 2016-07-27 09:47:31 -07:00
signal.c arc: don't leak bits of kernel stack into coredump 2016-10-28 03:01:32 -04:00
smp.c ARC: smp: Rename platform hook @init_cpu_smp -> @init_per_cpu 2015-12-17 12:56:56 +05:30
stacktrace.c arc: unwind: warn only once if DW2_UNWIND is disabled 2016-08-10 11:49:25 +02:00
sys.c ARC: ABIv3: fork/vfork wrappers not needed in "no-legacy-syscall" ABI 2013-03-11 19:01:10 +05:30
time.c ARC: timer: rtc: implement read loop in "C" vs. inline asm 2016-11-18 10:48:34 +01:00
traps.c ARC: rename unhandled exception handler 2015-04-13 15:14:57 +05:30
troubleshoot.c ARC: fix unused var wanring 2015-07-06 11:09:01 +05:30
unaligned.c ARC: [arcompact] brown paper bag bug in unaligned access delay slot fixup 2017-02-14 15:22:50 -08:00
unwind.c ARC: dw2 unwind: Catch Dwarf SNAFUs early 2015-12-21 14:01:49 +05:30
vmlinux.lds.S ARC: boot: Support Halt-on-reset and Run-on-reset SMP booting modes 2015-10-28 16:08:17 +05:30