perf bpf: Rename perf_include_dir to libbpf_include_dir

As this is where we expect to find bpf/bpf_helpers.h, etc.

This needs more work to make it follow LIBBPF_DYNAMIC=1 usage, i.e. when
not using the system libbpf it should use the headers in the in-kernel
sources libbpf in tools/lib/bpf.

We need to do that anyway to avoid this mixup system libbpf and
in-kernel files, so we'll get this sorted out that way.

And this also may become moot as we move to using BPF skels for this
feature.

Cc: Adrian Hunter <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.config

···
 
 # Among the variables below, these:
 #   perfexecdir
-#   perf_include_dir
+#   libbpf_include_dir
 #   perf_examples_dir
 #   template_dir
 #   mandir
···
 infodir = share/info
 perfexecdir = libexec/perf-core
 # FIXME: system's libbpf header directory, where we expect to find bpf/bpf_helpers.h, for instance
-perf_include_dir = /usr/include
+libbpf_include_dir = /usr/include
 perf_examples_dir = lib/perf/examples
 sharedir = $(prefix)/share
 template_dir = share/perf-core/templates
···
 mandir_SQ = $(subst ','\'',$(mandir))
 infodir_SQ = $(subst ','\'',$(infodir))
 perfexecdir_SQ = $(subst ','\'',$(perfexecdir))
-perf_include_dir_SQ = $(subst ','\'',$(perf_include_dir))
+libbpf_include_dir_SQ = $(subst ','\'',$(libbpf_include_dir))
 perf_examples_dir_SQ = $(subst ','\'',$(perf_examples_dir))
 template_dir_SQ = $(subst ','\'',$(template_dir))
 htmldir_SQ = $(subst ','\'',$(htmldir))
···
 
 ifneq ($(filter /%,$(firstword $(perfexecdir))),)
 perfexec_instdir = $(perfexecdir)
-perf_include_instdir = $(perf_include_dir)
+perf_include_instdir = $(libbpf_include_dir)
 perf_examples_instdir = $(perf_examples_dir)
 STRACE_GROUPS_INSTDIR = $(STRACE_GROUPS_DIR)
 tip_instdir = $(tipdir)
 else
 perfexec_instdir = $(prefix)/$(perfexecdir)
-perf_include_instdir = $(prefix)/$(perf_include_dir)
+perf_include_instdir = $(prefix)/$(libbpf_include_dir)
 perf_examples_instdir = $(prefix)/$(perf_examples_dir)
 STRACE_GROUPS_INSTDIR = $(prefix)/$(STRACE_GROUPS_DIR)
 tip_instdir = $(prefix)/$(tipdir)
···
 $(call detected_var,STRACE_GROUPS_DIR_SQ)
 $(call detected_var,prefix_SQ)
 $(call detected_var,perfexecdir_SQ)
-$(call detected_var,perf_include_dir_SQ)
+$(call detected_var,libbpf_include_dir_SQ)
 $(call detected_var,perf_examples_dir_SQ)
 $(call detected_var,tipdir_SQ)
 $(call detected_var,srcdir_SQ)

tools/perf/util/Build

···
 perf-$(CONFIG_LIBPFM4) += pfm.o
 
 CFLAGS_config.o   += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
-CFLAGS_llvm-utils.o += -DPERF_INCLUDE_DIR="BUILD_STR($(perf_include_dir_SQ))"
+CFLAGS_llvm-utils.o += -DLIBBPF_INCLUDE_DIR="BUILD_STR($(libbpf_include_dir_SQ))"
 
 # avoid compiler warnings in 32-bit mode
 CFLAGS_genelf_debug.o  += -Wno-packed

tools/perf/util/llvm-utils.c

···
 	char *pipe_template = NULL;
 	const char *opts = llvm_param.opts;
 	char *command_echo = NULL, *command_out;
-	char *perf_include_dir = system_path(PERF_INCLUDE_DIR);
+	char *libbpf_include_dir = system_path(LIBBPF_INCLUDE_DIR);
 
 	if (path[0] != '-' && realpath(path, abspath) == NULL) {
 		err = errno;
···
 
 	snprintf(linux_version_code_str, sizeof(linux_version_code_str),
 		 "0x%x", kernel_version);
-	if (asprintf(&perf_bpf_include_opts, "-I%s/", perf_include_dir) < 0)
+	if (asprintf(&perf_bpf_include_opts, "-I%s/", libbpf_include_dir) < 0)
 		goto errout;
 	force_set_env("NR_CPUS", nr_cpus_avail_str);
 	force_set_env("LINUX_VERSION_CODE", linux_version_code_str);
···
 	free(kbuild_dir);
 	free(kbuild_include_opts);
 	free(perf_bpf_include_opts);
-	free(perf_include_dir);
+	free(libbpf_include_dir);
 
 	if (!p_obj_buf)
 		free(obj_buf);
···
 	free(kbuild_include_opts);
 	free(obj_buf);
 	free(perf_bpf_include_opts);
-	free(perf_include_dir);
+	free(libbpf_include_dir);
 	free(pipe_template);
 	if (p_obj_buf)
 		*p_obj_buf = NULL;