Commit bbbc8032 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

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: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Reviewed-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Acked-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20200508043408.886394-15-npiggin@gmail.com
parent abd106fb

arch/powerpc/kernel/traps.c

+5 −0
Original line number Diff line number Diff line
@@ -443,6 +443,9 @@ void system_reset_exception(struct pt_regs *regs) 
	unsigned long hsrr0, hsrr1;

	bool nested = in_nmi();

	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
@@ -524,6 +527,8 @@ void system_reset_exception(struct pt_regs *regs) 
	if (!nested)

		nmi_exit();



	this_cpu_set_ftrace_enabled(ftrace_enabled);



	/* What should we do here? We could issue a shutdown or hard reset. */

}