From a99fc685214452aedabf9ac105bb99357006aa26 Mon Sep 17 00:00:00 2001
From: Andrea Adami <andrea.adami@gmail.com>
Date: Wed, 5 Sep 2018 17:07:48 +0200
Subject: [PATCH] kexec-arm64.c: workaround for getrandom() syscall

The syscall was added to OE's klibc.
Fix

| ../git/kexec/arch/arm64/kexec-arm64.c:19:10: fatal error: syscall.h: No such file or directory
|  #include <syscall.h>

and

| ../git/kexec/arch/arm64/kexec-arm64.c: In function 'setup_2nd_dtb':
| ../git/kexec/arch/arm64/kexec-arm64.c:499:12: warning: implicit declaration of function 'getrandom'; did you mean 'srandom'? [-Wimplicit-function-declaration]
|    result = getrandom(&fdt_val64,

Upstream-Status: Inappropriate [klibc specific]
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>

---
 kexec/arch/arm64/kexec-arm64.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/kexec/arch/arm64/kexec-arm64.c b/kexec/arch/arm64/kexec-arm64.c
index b143e86..88d4168 100644
--- a/kexec/arch/arm64/kexec-arm64.c
+++ b/kexec/arch/arm64/kexec-arm64.c
@@ -16,7 +16,11 @@
 #include <elf.h>
 
 #include <unistd.h>
+
+#ifndef __KLIBC__
 #include <syscall.h>
+#endif
+
 #include <errno.h>
 #include <linux/random.h>
 
@@ -487,10 +491,16 @@ static int setup_2nd_dtb(struct dtb *dtb, char *command_line, int on_crash)
 		 * have a valid random seed to pass to the
 		 * secondary kernel.
 		 */
+#ifndef __KLIBC__
 		result = syscall(SYS_getrandom, &fdt_val64,
 				sizeof(fdt_val64),
 				GRND_NONBLOCK);
-
+#else
+		extern ssize_t getrandom(void *, size_t, unsigned int);
+		result = getrandom(&fdt_val64,
+				sizeof(fdt_val64),
+				GRND_NONBLOCK);
+#endif
 		if(result == -1) {
 			fprintf(stderr, "%s: Reading random bytes failed.\n",
 					__func__);