A shutdown callback in a loadable module may need to distinguish a kexec reboot from a normal restart, halt, or poweroff. The Hyper-V VMBus driver needs this distinction when moving its kexec cleanup into a common syscore shutdown callback.
Add kexec_is_in_progress() and export it to GPL modules so the callback can remain guarded when VMBus is built as a module. Provide a false inline implementation when CONFIG_KEXEC_CORE is disabled. The helper reports only the normal kexec reboot path. Crash kexec and preserve-context kexec do not set this state. Signed-off-by: Shradha Gupta <[email protected]> Acked-by: Mike Rapoport (Microsoft) <[email protected]> Reviewed-by: Michael Kelley <[email protected]> Reviewed-by: Bradley Morgan <[email protected]> Reviewed-by: Naman Jain <[email protected]> --- include/linux/kexec.h | 2 ++ kernel/kexec_core.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 8a22bc9b8c6c..827a5311d97a 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -468,6 +468,7 @@ bool kexec_load_permitted(int kexec_image_type); /* flag to track if kexec reboot is in progress */ extern bool kexec_in_progress; +bool kexec_is_in_progress(void); #ifndef page_to_boot_pfn static inline unsigned long page_to_boot_pfn(struct page *page) @@ -544,6 +545,7 @@ static inline void *kimage_map_segment(struct kimage *image, int idx) { return NULL; } static inline void kimage_unmap_segment(void *buffer) { } #define kexec_in_progress false +static inline bool kexec_is_in_progress(void) { return false; } #endif /* CONFIG_KEXEC_CORE */ #ifdef CONFIG_KEXEC_SIG diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index dc770b9a6d05..282c7b3c6c35 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -23,6 +23,7 @@ #include <linux/hardirq.h> #include <linux/elf.h> #include <linux/elfcore.h> +#include <linux/export.h> #include <linux/utsname.h> #include <linux/numa.h> #include <linux/suspend.h> @@ -54,6 +55,12 @@ atomic_t __kexec_lock = ATOMIC_INIT(0); /* Flag to indicate we are going to kexec a new kernel */ bool kexec_in_progress = false; +bool kexec_is_in_progress(void) +{ + return kexec_in_progress; +} +EXPORT_SYMBOL_GPL(kexec_is_in_progress); + bool kexec_file_dbg_print; /* -- 2.43.0
