Call the new list unconditionally in vpanic, right before the early crash kexec. The legacy list, crash_kexec_post_notifiers and the cpu shutdown sequence are untouched. Also note in the kernel parameters entry that the option has no effect on the pre kdump list.
Signed-off-by: Bradley Morgan <[email protected]> --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ kernel/panic.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b5493a7f8f22..a77ecf3bd564 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1042,6 +1042,9 @@ Kernel parameters or extra data dumped by panic_print. Note that some configurations enable this option unconditionally, like Hyper-V, PowerPC (fadump) and AMD SEV-SNP. + This option does not affect the pre kdump notifier + list (see include/linux/panic_notifier.h), which + always runs before the jump to the kdump kernel. crashkernel=size[KMG][@offset[KMG]] [KNL,EARLY] Using kexec, Linux can switch to a 'crash kernel' diff --git a/kernel/panic.c b/kernel/panic.c index 94ce7a94f118..f9ad0250da67 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -664,6 +664,13 @@ void vpanic(const char *fmt, va_list args) */ kgdb_panic(buf); + /* + * Tell the hypervisor or firmware about the panic. This runs on + * every panic, before a potential crash kexec, so the upcall is + * not lost when a crash kernel is loaded. + */ + panic_pre_kdump_notify(buf); + /* * If we have crashed and we have a crash kernel loaded let it handle * everything else. -- 2.53.0
