[oe] [meta-initramfs][PATCH] kexec-tools-klibc: fix build for qemuarm64

[Andrea Adami]

Since c3f043241a86 upstream the getrandom() syscall is used.
Last recipe bump overlooked that.

The syscall has been added to OE's klibc so we can fix this.

Signed-off-by: Andrea Adami <andrea.adami at gmail.com>
---
 ...-arm64.c-workaround-for-getrandom-syscall.patch | 61 ++++++++++++++++++++++
 .../recipes-kernel/kexec/kexec-tools-klibc_git.bb  |  3 +-
 2 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/arm64_kexec-arm64.c-workaround-for-getrandom-syscall.patch

diff --git a/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/arm64_kexec-arm64.c-workaround-for-getrandom-syscall.patch b/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/arm64_kexec-arm64.c-workaround-for-getrandom-syscall.patch
new file mode 100644
index 0000000..b22ac3a
--- /dev/null
+++ b/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/arm64_kexec-arm64.c-workaround-for-getrandom-syscall.patch
@@ -0,0 +1,61 @@
+From 10afeecd10499fbd64b2c68d3b076c6906df441f Mon Sep 17 00:00:00 2001
+From: Andrea Adami <andrea.adami at 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 at 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 7a12479..8a7f5c5 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) {
+ 			dbgprintf("%s: Reading random bytes failed.\n",
+ 					__func__);
+-- 
+2.7.4
+
diff --git a/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc_git.bb b/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc_git.bb
index d6d3dc8..4bbda4c 100644
--- a/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc_git.bb
+++ b/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc_git.bb
@@ -51,7 +51,8 @@ SRC_URI_append_x86-64 = " file://x86_sys_io.patch file://x86_basename.patch \
 
 SRC_URI_append_aarch64 = " file://arm64_purgatory-Makefile-remove-unknown-flags.patch \
                            file://arm64_kexec-image-header.h-add-missing-le64toh.patch \
-                           file://arm64-crashdump-arm64.c-fix-warning.patch"
+                           file://arm64-crashdump-arm64.c-fix-warning.patch \
+                           file://arm64_kexec-arm64.c-workaround-for-getrandom-syscall.patch"
 
 SRC_URI_append_powerpc = " file://powerpc-purgatory-Makefile-remove-unknown-flags.patch"
 
-- 
2.7.4