1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index d9bb0a57d208..66d56ac0f64c 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -69,7 +69,18 @@ typedef unsigned long kimage_entry_t;
 #define IND_SOURCE       0x8
 
 struct kexec_segment {
-	void __user *buf;
+	/*
+	 * This pointer can point to user memory if kexec_load() system
+	 * call is used or will point to kernel memory if
+	 * kexec_file_load() system call is used.
+	 *
+	 * Use ->buf when expecting to deal with user memory and use ->kbuf
+	 * when expecting to deal with kernel memory.
+	 */
+	union {
+		void __user *buf;
+		void *kbuf;
+	};
 	size_t bufsz;
 	unsigned long mem;
 	size_t memsz;