perf event: Remove needless include directives from event.h

bpf.h and build-id.h are not needed at all in event.h, remove them.

And fixup the fallout of files that were getting needed stuff from this
now pruned include.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-rdm3dgtlrndmmnlc4bafsg3b@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/powerpc/util/unwind-libdw.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <elfutils/libdwfl.h>
+#include <linux/kernel.h>
 #include "../../util/unwind-libdw.h"
 #include "../../util/perf_regs.h"
 #include "../../util/event.h"

tools/perf/arch/x86/util/perf_regs.c

@@ -2,6 +2,7 @@
 #include <errno.h>
 #include <string.h>
 #include <regex.h>
+#include <linux/kernel.h>
 #include <linux/zalloc.h>
 
 #include "../../perf-sys.h"

tools/perf/perf.c

@@ -10,6 +10,7 @@
 #include "builtin.h"
 #include "perf.h"
 
+#include "util/build-id.h"
 #include "util/cache.h"
 #include "util/env.h"
 #include <subcmd/exec-cmd.h>

tools/perf/util/bpf-event.h

@@ -13,6 +13,7 @@ struct machine;
 union perf_event;
 struct perf_env;
 struct perf_sample;
+struct perf_session;
 struct record_opts;
 struct evlist;
 struct target;

tools/perf/util/callchain.h

@@ -8,6 +8,7 @@
 #include "map_symbol.h"
 #include "branch.h"
 
+struct evsel;
 struct map;
 
 #define HELP_PAD "\t\t\t\t"

tools/perf/util/config.c

@@ -17,6 +17,8 @@
 #include "util/event.h"  /* proc_map_timeout */
 #include "util/hist.h"  /* perf_hist_config */
 #include "util/llvm-utils.h"   /* perf_llvm_config */
+#include "build-id.h"
+#include "debug.h"
 #include "config.h"
 #include "debug.h"
 #include <sys/types.h>

tools/perf/util/debug.c

@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <sys/wait.h>
 #include <api/debug.h>
+#include <linux/kernel.h>
 #include <linux/time64.h>
 #ifdef HAVE_BACKTRACE_SUPPORT
 #include <execinfo.h>

tools/perf/util/event.h

@@ -1,17 +1,23 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __PERF_RECORD_H
 #define __PERF_RECORD_H
-
-#include <limits.h>
+/*
+ * The linux/stddef.h isn't need here, but is needed for __always_inline used
+ * in files included from uapi/linux/perf_event.h such as
+ * /usr/include/linux/swab.h and /usr/include/linux/byteorder/little_endian.h,
+ * detected in at least musl libc, used in Alpine Linux. -acme
+ */
 #include <stdio.h>
-#include <linux/kernel.h>
-#include <linux/bpf.h>
-#include <linux/perf_event.h>
+#include <linux/stddef.h>
 #include <perf/event.h>
+#include <linux/types.h>
 
-#include "build-id.h"
 #include "perf_regs.h"
 
+struct dso;
+struct machine;
+struct perf_event_attr;
+
 #ifdef __LP64__
 /*
  * /usr/include/inttypes.h uses just 'lu' for PRIu64, but we end up defining