[PATCH 0/3] Use nmi_panic() in panic on NMI case

From: Hidehiro Kawai
Date: Mon Feb 29 2016 - 21:29:16 EST

commit 1717f2096b54 ("panic, x86: Fix re-entrance problem due to
panic on NMI") and commit 58c5661f2144 ("panic, x86: Allow CPUs to
save registers even if looping in NMI context") introduced nmi_panic()
which prevents concurrent/recursive execution of panic(). It also
saves registers for the crash dump on x86.

However, there are some cases where NMI handlers still use panic().
This patch set partially replaces them with nmi_panic() in those

Even if applying this patch set, some NMI or similar handlers (e.g.
MCE handler) remains to use panic(). This is because I can't test
them well and actual problems won't happen. For example, the
possibility that normal panic and panic on MCE happen simultaneously
is very low.

Hidehiro Kawai (3):
panic: Export panic_cpu and nmi_panic_self_stop
ipmi/watchdog: Use nmi_panic() when kernel panics in NMI handler
hpwdt: Use nmi_panic() when kernel panics in NMI handler

drivers/char/ipmi/ipmi_watchdog.c | 2 +-
drivers/watchdog/hpwdt.c | 12 ++++++++++--
kernel/panic.c | 2 ++
3 files changed, 13 insertions(+), 3 deletions(-)

Hidehiro Kawai
Hitachi, Ltd. Research & Development Group