kernel: fix portability issue with perf on linux 5.4

Remove dependencies on core kernel headers in host tools used to build perf,
which break on any non-linux system

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/devel/perf/Makefile

@@ -36,6 +36,8 @@ define Package/perf/description
   perf is the Linux performance monitoring tool
 endef
 
+HOST_CFLAGS += -I$(LINUX_DIR)/tools/include
+
 MAKE_FLAGS = \
 	ARCH="$(LINUX_KARCH)" \
 	NO_LIBPERL=1 \
@@ -54,6 +56,7 @@ MAKE_FLAGS = \
 	LD="$(TARGET_CROSS)ld" \
 	CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
 	LDFLAGS="$(TARGET_LDFLAGS)" \
+	KBUILD_HOSTCFLAGS="$(HOST_CFLAGS)" \
 	$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
 	WERROR=0 \
 	O=$(PKG_BUILD_DIR) \

target/linux/generic/hack-5.4/212-tools_portability.patch

@@ -1,9 +1,8 @@
 From 48232d3d931c95953ce2ddfe7da7bb164aef6a73 Mon Sep 17 00:00:00 2001
 From: Felix Fietkau <nbd@nbd.name>
 Date: Fri, 7 Jul 2017 17:03:16 +0200
-Subject: linux-3.6: fix portability of some includes files in tools/ used on the host
+Subject: fix portability of some includes files in tools/ used on the host
 
-lede-commit: 6040b1d29ab1f047c5e49b748abcb6a3196add28
 Signed-off-by: Felix Fietkau <nbd@nbd.name>
 ---
  tools/include/tools/be_byteshift.h |  4 ++++
@@ -40,26 +39,72 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  static inline uint16_t __get_unaligned_le16(const uint8_t *p)
 --- /dev/null
 +++ b/tools/include/tools/linux_types.h
-@@ -0,0 +1,22 @@
+@@ -0,0 +1,26 @@
 +#ifndef __LINUX_TYPES_H
 +#define __LINUX_TYPES_H
 +
 +#include <stdint.h>
 +
++typedef int8_t __s8;
 +typedef uint8_t __u8;
 +typedef uint8_t __be8;
 +typedef uint8_t __le8;
 +
++typedef int16_t __s16;
 +typedef uint16_t __u16;
 +typedef uint16_t __be16;
 +typedef uint16_t __le16;
 +
++typedef int32_t __s32;
 +typedef uint32_t __u32;
 +typedef uint32_t __be32;
 +typedef uint32_t __le32;
 +
++typedef int64_t __s64;
 +typedef uint64_t __u64;
 +typedef uint64_t __be64;
 +typedef uint64_t __le64;
 +
 +#endif
+--- a/tools/include/linux/types.h
++++ b/tools/include/linux/types.h
+@@ -7,8 +7,12 @@
+ #include <stdint.h>
+ 
+ #define __SANE_USERSPACE_TYPES__	/* For PPC64, to get LL64 types */
++#ifndef __linux__
++#include <tools/linux_types.h>
++#else
+ #include <asm/types.h>
+ #include <asm/posix_types.h>
++#endif
+ 
+ struct page;
+ struct kmem_cache;
+--- a/tools/perf/pmu-events/jevents.c
++++ b/tools/perf/pmu-events/jevents.c
+@@ -1,4 +1,6 @@
++#ifdef __linux__
+ #define  _XOPEN_SOURCE 500	/* needed for nftw() */
++#endif
+ #define  _GNU_SOURCE		/* needed for asprintf() */
+ 
+ /* Parse event JSON files */
+@@ -35,6 +37,7 @@
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
++#include <strings.h>
+ #include <ctype.h>
+ #include <unistd.h>
+ #include <stdarg.h>
+--- a/tools/perf/pmu-events/json.c
++++ b/tools/perf/pmu-events/json.c
+@@ -38,7 +38,6 @@
+ #include <unistd.h>
+ #include "jsmn.h"
+ #include "json.h"
+-#include <linux/kernel.h>
+ 
+ 
+ static char *mapfile(const char *fn, size_t *size)