On 5/23/22 03:36, Sourabh Jain wrote:
Hello Eric, On 06/05/22 00:15, Eric DeVolder wrote:CPU and memory change notifications are received in order to regenerate the elfcorehdr. To support cpu hotplug, a callback is registered to capture the CPUHP_AP_ONLINE_DYN online and offline events via cpuhp_setup_state_nocalls(). To support memory hotplug, a notifier is registered to capture the MEM_ONLINE and MEM_OFFLINE events via register_memory_notifier(). The cpu callback and memory notifiers call handle_hotplug_event() to handle the hot plug/unplug event. Then handle_hotplug_event() dispatches the event to the architecture specific arch_crash_handle_hotplug_event(). During the process, the kexec_mutex is held. Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx> --- include/linux/crash_core.h | 10 +++++ include/linux/kexec.h | 5 +++ kernel/crash_core.c | 92 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+) diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h index de62a722431e..a240f84348aa 100644 --- a/include/linux/crash_core.h +++ b/include/linux/crash_core.h @@ -84,4 +84,14 @@ int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, int parse_crashkernel_low(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); +#define KEXEC_CRASH_HP_REMOVE_CPU 0 +#define KEXEC_CRASH_HP_ADD_CPU 1 +#define KEXEC_CRASH_HP_REMOVE_MEMORY 2 +#define KEXEC_CRASH_HP_ADD_MEMORY 3 +#define KEXEC_CRASH_HP_INVALID_CPU -1U + +struct kimage; +void arch_crash_handle_hotplug_event(struct kimage *image, unsigned int hp_action, + unsigned int cpu); + #endif /* LINUX_CRASH_CORE_H */ diff --git a/include/linux/kexec.h b/include/linux/kexec.h index f93f2591fc1e..5935bc78ed7f 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -308,6 +308,11 @@ struct kimage { struct purgatory_info purgatory_info; #endif + bool hotplug_event; + unsigned int offlinecpu; + bool elfcorehdr_index_valid; + int elfcorehdr_index;How about keeping above kimage elements under below config? #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_MEMORY_HOTPLUG) Thanks, Sourabh Jain
Yes, of course. Eric _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
