1 files changed, 28 insertions, 4 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 6958c6b471f4..8107606ad1e8 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -390,7 +390,10 @@ extern void machine_kexec_cleanup(struct kimage *image);
 extern int kernel_kexec(void);
 extern struct page *kimage_alloc_control_pages(struct kimage *image,
 						unsigned int order);
-int machine_kexec_post_load(struct kimage *image);
+
+#ifndef machine_kexec_post_load
+static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
+#endif
 
 extern void __crash_kexec(struct pt_regs *);
 extern void crash_kexec(struct pt_regs *);
@@ -423,10 +426,21 @@ extern bool kexec_in_progress;
 
 int crash_shrink_memory(unsigned long new_size);
 size_t crash_get_memory_size(void);
-void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
 
-void arch_kexec_protect_crashkres(void);
-void arch_kexec_unprotect_crashkres(void);
+#ifndef arch_kexec_protect_crashkres
+/*
+ * Protection mechanism for crashkernel reserved memory after
+ * the kdump kernel is loaded.
+ *
+ * Provide an empty default implementation here -- architecture
+ * code may override this
+ */
+static inline void arch_kexec_protect_crashkres(void) { }
+#endif
+
+#ifndef arch_kexec_unprotect_crashkres
+static inline void arch_kexec_unprotect_crashkres(void) { }
+#endif
 
 #ifndef page_to_boot_pfn
 static inline unsigned long page_to_boot_pfn(struct page *page)
@@ -456,6 +470,16 @@ static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
 }
 #endif
 
+#ifndef crash_free_reserved_phys_range
+static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
+{
+	unsigned long addr;
+
+	for (addr = begin; addr < end; addr += PAGE_SIZE)
+		free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
+}
+#endif
+
 static inline unsigned long virt_to_boot_phys(void *addr)
 {
 	return phys_to_boot_phys(__pa((unsigned long)addr));