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| author | Leonardo Bras <leobras.c@gmail.com> | 2020-05-12 23:45:35 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-06-02 12:59:07 +0200 |
| commit | af2876b501e42c3fb5174cac9dd02598436f0fdf (patch) | |
| tree | 4ec069414fb9c0383185ebc4fb9cf59b81857878 /arch/powerpc/include/asm | |
| parent | powerpc/kernel: Enables memory hot-remove after reboot on pseries guests (diff) | |
| download | linux-af2876b501e42c3fb5174cac9dd02598436f0fdf.tar.xz linux-af2876b501e42c3fb5174cac9dd02598436f0fdf.zip | |
powerpc/crash: Use NMI context for printk when starting to crash
Currently, if printk lock (logbuf_lock) is held by other thread during
crash, there is a chance of deadlocking the crash on next printk, and
blocking a possibly desired kdump.
At the start of default_machine_crash_shutdown, make printk enter
NMI context, as it will use per-cpu buffers to store the message,
and avoid locking logbuf_lock.
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200512214533.93878-1-leobras.c@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm')
0 files changed, 0 insertions, 0 deletions