perf beauty: Introduce scrape script for 'clone' syscall 'flags' argument

It was using the first variation on producing a string representation
for a binary flag, one that used the copy of uapi/linux/sched.h with
preprocessor tricks that had to be updated everytime a new flag was
introduced.

Use the more recent scrape script + strarray + strarray__scnprintf_flags() combo.

  $ tools/perf/trace/beauty/clone.sh | head -5
  static const char *clone_flags[] = {
  	[ilog2(0x00000100) + 1] = "VM",
  	[ilog2(0x00000200) + 1] = "FS",
  	[ilog2(0x00000400) + 1] = "FILES",
  	[ilog2(0x00000800) + 1] = "SIGHAND",
  $

Now we can move uapi/linux/sched.h from tools/include/, that is used for
building perf to the scrape only directory tools/perf/trace/beauty/include.

Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/ZfnULIn3XKDq0bpc@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Makefile.perf

@@ -485,13 +485,20 @@ x86_arch_asm_dir := $(srctree)/tools/arch/x86/include/asm/
 
 beauty_outdir := $(OUTPUT)trace/beauty/generated
 beauty_ioctl_outdir := $(beauty_outdir)/ioctl
-drm_ioctl_array := $(beauty_ioctl_outdir)/drm_ioctl_array.c
-drm_hdr_dir := $(srctree)/tools/include/uapi/drm
-drm_ioctl_tbl := $(srctree)/tools/perf/trace/beauty/drm_ioctl.sh
 
 # Create output directory if not already present
 $(shell [ -d '$(beauty_ioctl_outdir)' ] || mkdir -p '$(beauty_ioctl_outdir)')
 
+clone_flags_array := $(beauty_outdir)/clone_flags_array.c
+clone_flags_tbl := $(srctree)/tools/perf/trace/beauty/clone.sh
+
+$(clone_flags_array): $(beauty_uapi_linux_dir)/sched.h $(clone_flags_tbl)
+	$(Q)$(SHELL) '$(clone_flags_tbl)' $(beauty_uapi_linux_dir) > $@
+
+drm_ioctl_array := $(beauty_ioctl_outdir)/drm_ioctl_array.c
+drm_hdr_dir := $(srctree)/tools/include/uapi/drm
+drm_ioctl_tbl := $(srctree)/tools/perf/trace/beauty/drm_ioctl.sh
+
 $(drm_ioctl_array): $(drm_hdr_dir)/drm.h $(drm_hdr_dir)/i915_drm.h $(drm_ioctl_tbl)
 	$(Q)$(SHELL) '$(drm_ioctl_tbl)' $(drm_hdr_dir) > $@
 
@@ -765,6 +772,7 @@ build-dir   = $(or $(__build-dir),.)
 
 prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders \
 	arm64-sysreg-defs \
+	$(clone_flags_array) \
 	$(drm_ioctl_array) \
 	$(fadvise_advice_array) \
 	$(fsconfig_arrays) \

tools/perf/check-headers.sh

@@ -15,7 +15,6 @@ FILES=(
   "include/uapi/linux/kvm.h"
   "include/uapi/linux/in.h"
   "include/uapi/linux/perf_event.h"
-  "include/uapi/linux/sched.h"
   "include/uapi/linux/seccomp.h"
   "include/uapi/linux/vhost.h"
   "include/linux/bits.h"
@@ -93,6 +92,7 @@ BEAUTY_FILES=(
   "include/uapi/linux/fs.h"
   "include/uapi/linux/mount.h"
   "include/uapi/linux/prctl.h"
+  "include/uapi/linux/sched.h"
   "include/uapi/linux/usbdevice_fs.h"
   "include/uapi/sound/asound.h"
 )

tools/perf/trace/beauty/clone.c

@@ -7,52 +7,16 @@
 
 #include "trace/beauty/beauty.h"
 #include <linux/kernel.h>
+#include <linux/log2.h>
 #include <sys/types.h>
-#include <uapi/linux/sched.h>
+#include <sched.h>
 
 static size_t clone__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix)
 {
-	const char *prefix = "CLONE_";
-	int printed = 0;
+#include "trace/beauty/generated/clone_flags_array.c"
+	static DEFINE_STRARRAY(clone_flags, "CLONE_");
 
-#define	P_FLAG(n) \
-	if (flags & CLONE_##n) { \
-		printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
-		flags &= ~CLONE_##n; \
-	}
-
-	P_FLAG(VM);
-	P_FLAG(FS);
-	P_FLAG(FILES);
-	P_FLAG(SIGHAND);
-	P_FLAG(PIDFD);
-	P_FLAG(PTRACE);
-	P_FLAG(VFORK);
-	P_FLAG(PARENT);
-	P_FLAG(THREAD);
-	P_FLAG(NEWNS);
-	P_FLAG(SYSVSEM);
-	P_FLAG(SETTLS);
-	P_FLAG(PARENT_SETTID);
-	P_FLAG(CHILD_CLEARTID);
-	P_FLAG(DETACHED);
-	P_FLAG(UNTRACED);
-	P_FLAG(CHILD_SETTID);
-	P_FLAG(NEWCGROUP);
-	P_FLAG(NEWUTS);
-	P_FLAG(NEWIPC);
-	P_FLAG(NEWUSER);
-	P_FLAG(NEWPID);
-	P_FLAG(NEWNET);
-	P_FLAG(IO);
-	P_FLAG(CLEAR_SIGHAND);
-	P_FLAG(INTO_CGROUP);
-#undef P_FLAG
-
-	if (flags)
-		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
-
-	return printed;
+	return strarray__scnprintf_flags(&strarray__clone_flags, bf, size, show_prefix, flags);
 }
 
 size_t syscall_arg__scnprintf_clone_flags(char *bf, size_t size, struct syscall_arg *arg)

tools/perf/trace/beauty/clone.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+# SPDX-License-Identifier: LGPL-2.1
+
+if [ $# -ne 1 ] ; then
+	beauty_uapi_linux_dir=tools/perf/trace/beauty/include/uapi/linux/
+else
+	beauty_uapi_linux_dir=$1
+fi
+
+linux_sched=${beauty_uapi_linux_dir}/sched.h
+
+printf "static const char *clone_flags[] = {\n"
+regex='^[[:space:]]*#[[:space:]]*define[[:space:]]+CLONE_([^_]+[[:alnum:]_]+)[[:space:]]+(0x[[:xdigit:]]+)[[:space:]]*.*'
+grep -E $regex ${linux_sched} | \
+	sed -r "s/$regex/\2 \1/g"	| \
+	xargs printf "\t[ilog2(%s) + 1] = \"%s\",\n"
+printf "};\n"