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powerpc/traps: Do not trace system reset 

Similarly to the previous patch, do not trace system reset. This code
is used when there is a crash or hang, and tracing disturbs the system
more and has been known to crash in the crash handling path.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20200508043408.886394-15-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-05-08 14:34:06 +10:00 committed by Michael Ellerman
parent abd106fb43
commit bbbc8032b0
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/kernel/traps.c
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@ -443,6 +443,9 @@ void system_reset_exception(struct pt_regs *regs)
unsigned long hsrr0, hsrr1; unsigned long hsrr0, hsrr1;
bool nested = in_nmi(); bool nested = in_nmi();
bool saved_hsrrs = false; bool saved_hsrrs = false;
u8 ftrace_enabled = this_cpu_get_ftrace_enabled();
this_cpu_set_ftrace_enabled(0);
/* /*
* Avoid crashes in case of nested NMI exceptions. Recoverability * Avoid crashes in case of nested NMI exceptions. Recoverability
@ -524,6 +527,8 @@ void system_reset_exception(struct pt_regs *regs)
if (!nested) if (!nested)
nmi_exit(); nmi_exit();
this_cpu_set_ftrace_enabled(ftrace_enabled);
/* What should we do here? We could issue a shutdown or hard reset. */ /* What should we do here? We could issue a shutdown or hard reset. */
} }