diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-05-08 06:34:06 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-18 16:10:35 +0200 |
| commit | bbbc8032b00f8ef287894425fbdb691049e28d39 (patch) | |
| tree | a241324825ad1719fa4a0d3caa6d1365f7898b44 /arch/powerpc/kernel/traps.c | |
| parent | powerpc/64s: machine check do not trace real-mode handler (diff) | |
| download | linux-bbbc8032b00f8ef287894425fbdb691049e28d39.tar.xz linux-bbbc8032b00f8ef287894425fbdb691049e28d39.zip | |
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
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 9f6852322e59..ee209c5a1ad7 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -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 @@ out: if (!nested) nmi_exit(); + this_cpu_set_ftrace_enabled(ftrace_enabled); + /* What should we do here? We could issue a shutdown or hard reset. */ } |