[PATCH v8 5/8] crash: pass hotplug action type to arch crash hotplug handler

[Sourabh Jain <sourabhjain@linux.ibm.com>]

On PowerPC, the crash update action for CPU and Memory hotplug events
is not the same. Since arch_crash_handle_hotplug_event is a common
crash hotplug handler for both CPU and Memory hot un/plug events,
it is hard to differentiate which hotplug event triggered the arch
crash hotplug handler and decide the crash update action accordingly.

Pass the hotplug action type to arch specific crash hotplug handler
so that corresponding crash update action can be taken based on the
hotplug action type.

Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 arch/x86/include/asm/kexec.h | 2 +-
 arch/x86/kernel/crash.c      | 3 ++-
 include/linux/kexec.h        | 2 +-
 kernel/crash_core.c          | 2 +-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 1bc852ce347d4..ec33a592a2ddd 100644
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h
@@ -213,7 +213,7 @@ extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
 extern void kdump_nmi_shootdown_cpus(void);
 
 #ifdef CONFIG_CRASH_HOTPLUG
-void arch_crash_handle_hotplug_event(struct kimage *image);
+void arch_crash_handle_hotplug_event(struct kimage *image, unsigned int hp_action);
 #define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index ba11c7e70edb1..c0b5afad37565 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -463,12 +463,13 @@ int crash_load_segments(struct kimage *image)
 /**
  * arch_crash_handle_hotplug_event() - Handle hotplug elfcorehdr changes
  * @image: the active struct kimage
+ * @hp_action: the hot un/plug action being handled
  *
  * To accurately reflect hot un/plug changes, the new elfcorehdr
  * is prepared in a kernel buffer, and then it is written on top
  * of the existing/old elfcorehdr.
  */
-void arch_crash_handle_hotplug_event(struct kimage *image)
+void arch_crash_handle_hotplug_event(struct kimage *image, unsigned int hp_action)
 {
 	void *elfbuf = NULL, *old_elfcorehdr;
 	unsigned long nr_mem_ranges;
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 881e8a43db89e..5461a4ad50e2a 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -509,7 +509,7 @@ static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) {
 #endif
 
 #ifndef arch_crash_handle_hotplug_event
-static inline void arch_crash_handle_hotplug_event(struct kimage *image) { }
+static inline void arch_crash_handle_hotplug_event(struct kimage *image, unsigned int hp_action) { }
 #endif
 
 #else /* !CONFIG_KEXEC_CORE */
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 898d8d2fe2e2e..3aede7187c8b4 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -789,7 +789,7 @@ static void handle_hotplug_event(unsigned int hp_action, unsigned int cpu)
 					cpu : KEXEC_CRASH_HP_INVALID_CPU;
 
 			/* Now invoke arch-specific update handler */
-			arch_crash_handle_hotplug_event(image);
+			arch_crash_handle_hotplug_event(image, hp_action);
 
 			/* No longer handling a hotplug event */
 			image->hotplug_event = false;
-- 
2.39.1