rcar-gen3: linux-renesas: WORKAROUND to fix build error with Linux v4.14

This commit backports a fix patch from Linux v4.15 to fix build error
below:

| ERROR: linux-libc-headers-4.14-r0 do_install: oe_multilib_header:
Unable to find header asm/bpf_perf_event.h.

Signed-off-by: Thuy Tran <thuy.tran.xh@renesas.com>
Signed-off-by: Takamitsu Honda <takamitsu.honda.pv@renesas.com>

2 files changed, 66 insertions, 0 deletions

diff --git a/meta-rcar-gen3/recipes-kernel/linux/linux-renesas/0001-arm64-bpf-correct-broken-uapi-for-BPF_PROG_TYPE_PERF.patch b/meta-rcar-gen3/recipes-kernel/linux/linux-renesas/0001-arm64-bpf-correct-broken-uapi-for-BPF_PROG_TYPE_PERF.patch
new file mode 100644
index 0000000..9c38a32
--- /dev/null
+++ b/meta-rcar-gen3/recipes-kernel/linux/linux-renesas/0001-arm64-bpf-correct-broken-uapi-for-BPF_PROG_TYPE_PERF.patch
@@ -0,0 +1,61 @@
+From a39cada70268aadff7153e4f782bcd90a5c69d07 Mon Sep 17 00:00:00 2001
+From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+Date: Mon, 4 Dec 2017 10:56:46 +0100
+Subject: [PATCH] arm64/bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT
+ program type
+
+Correct the broken uapi for the BPF_PROG_TYPE_PERF_EVENT program type
+by exporting the user_pt_regs structure instead of the pt_regs structure
+that is in-kernel only.
+
+Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
+Acked-by: Alexei Starovoitov <ast@kernel.org>
+Cc: Will Deacon <will.deacon@arm.com>
+Cc: Mark Rutland <mark.rutland@arm.com>
+Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
+Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
+---
+ arch/arm64/include/asm/perf_event.h          | 2 ++
+ arch/arm64/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
+ 2 files changed, 11 insertions(+)
+ create mode 100644 arch/arm64/include/uapi/asm/bpf_perf_event.h
+
+diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
+index 8d5cbec..f9ccc36 100644
+--- a/arch/arm64/include/asm/perf_event.h
++++ b/arch/arm64/include/asm/perf_event.h
+@@ -18,6 +18,7 @@
+ #define __ASM_PERF_EVENT_H
+ 
+ #include <asm/stack_pointer.h>
++#include <asm/ptrace.h>
+ 
+ #define	ARMV8_PMU_MAX_COUNTERS	32
+ #define	ARMV8_PMU_COUNTER_MASK	(ARMV8_PMU_MAX_COUNTERS - 1)
+@@ -79,6 +80,7 @@ struct pt_regs;
+ extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
+ extern unsigned long perf_misc_flags(struct pt_regs *regs);
+ #define perf_misc_flags(regs)	perf_misc_flags(regs)
++#define perf_arch_bpf_user_pt_regs(regs) &regs->user_regs
+ #endif
+ 
+ #define perf_arch_fetch_caller_regs(regs, __ip) { \
+diff --git a/arch/arm64/include/uapi/asm/bpf_perf_event.h b/arch/arm64/include/uapi/asm/bpf_perf_event.h
+new file mode 100644
+index 0000000..b551b74
+--- /dev/null
++++ b/arch/arm64/include/uapi/asm/bpf_perf_event.h
+@@ -0,0 +1,9 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
++#define _UAPI__ASM_BPF_PERF_EVENT_H__
++
++#include <asm/ptrace.h>
++
++typedef struct user_pt_regs bpf_user_pt_regs_t;
++
++#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */
+-- 
+2.7.4
+
diff --git a/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_4.14.bb b/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_4.14.bb
index 1def91d..f0aa4b8 100644
--- a/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_4.14.bb
+++ b/meta-rcar-gen3/recipes-kernel/linux/linux-renesas_4.14.bb
@@ -68,6 +68,11 @@ SRC_URI_append = " \
     ${@bb.utils.contains('MACHINE_FEATURES','usb3','file://usb3.cfg','',d)} \
 "
 
+# W/A Fix build issue with Linux v4.14
+SRC_URI_append = " \
+    file://0001-arm64-bpf-correct-broken-uapi-for-BPF_PROG_TYPE_PERF.patch \
+"
+
 do_download_firmware () {
     install -m 755 ${WORKDIR}/r8a779x_usb3_v*.dlmem ${STAGING_KERNEL_DIR}/firmware
 }