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powerpc: improve handling of unrecoverable system reset
author
Nicholas Piggin
<npiggin@gmail.com>
Sat, 30 Jan 2021 13:08:35 +0000
(23:08 +1000)
committer
Michael Ellerman
<mpe@ellerman.id.au>
Mon, 8 Feb 2021 13:02:11 +0000
(
00:02
+1100)
If an unrecoverable system reset hits in process context, the system
does not have to panic. Similar to machine check, call nmi_exit()
before die().
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link:
https://lore.kernel.org/r/20210130130852.2952424-26-npiggin@gmail.com
arch/powerpc/kernel/traps.c
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diff --git
a/arch/powerpc/kernel/traps.c
b/arch/powerpc/kernel/traps.c
index 3a8699995a77946814fa5625486f69030f8ecc37..f70d3f6174c8ad4a907b2ba897b5fc701a8f4f41 100644
(file)
--- a/
arch/powerpc/kernel/traps.c
+++ b/
arch/powerpc/kernel/traps.c
@@
-503,8
+503,11
@@
out:
die("Unrecoverable nested System Reset", regs, SIGABRT);
#endif
/* Must die if the interrupt is not recoverable */
- if (!(regs->msr & MSR_RI))
+ if (!(regs->msr & MSR_RI)) {
+ /* For the reason explained in die_mce, nmi_exit before die */
+ nmi_exit();
die("Unrecoverable System Reset", regs, SIGABRT);
+ }
if (saved_hsrrs) {
mtspr(SPRN_HSRR0, hsrr0);