linux/arch/arc/mm
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
..
Makefile ARC: mm: HIGHMEM: kmap API implementation 2015-10-28 19:49:04 +05:30
cache.c ARC: mm: Decouple RAM base address from kernel link address 2017-09-01 11:26:27 -07:00
dma.c ARC fixes for 4.13-rc7 2017-08-21 13:30:36 -07:00
extable.c ARC: uaccess: enable INLINE_COPY_{TO,FROM}_USER ... 2017-03-30 00:07:48 -04:00
fault.c ARC: typo fix in mm/fault.c 2017-08-28 15:17:36 -07:00
highmem.c ARC: export kmap 2016-08-19 10:45:29 -07:00
init.c ARC: mm: Decouple RAM base address from kernel link address 2017-09-01 11:26:27 -07:00
ioremap.c ARCv2: Support dynamic peripheral address space in HS38 rel 3.0 cores 2016-09-30 14:48:17 -07:00
mmap.c mm: larger stack guard gap, between vmas 2017-06-19 21:50:20 +08:00
tlb.c ARC: Re-enable MMU upon Machine Check exception 2017-09-01 11:29:05 -07:00
tlbex.S ARC: [plat-eznps] Fix TLB Errata 2017-08-28 15:17:36 -07:00