panic: fix the panic_print NMI backtrace setting

Commit 8d470a45d1a6 ("panic: add option to dump all CPUs backtraces in
panic_print") introduced a setting for the "panic_print" kernel parameter
to allow users to request a NMI backtrace on panic.  Problem is that the
panic_print handling happens after the secondary CPUs are already
disabled, hence this option ended-up being kind of a no-op - kernel skips
the NMI trace in idling CPUs, which is the case of offline CPUs.

Fix it by checking the NMI backtrace bit in the panic_print prior to the
CPU disabling function.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 8d470a45d1a6 ("panic: add option to dump all CPUs backtraces in panic_print")
Signed-off-by: Guilherme G. Piccoli <[email protected]>
Cc: <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Feng Tang <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Hidehiro Kawai <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Michael Kelley <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions