[PATCH v2 11/14] perf kbuild: remove legacy libdwarf-related build variables

From: Alexis Berlemont
Date: Thu Oct 23 2014 - 17:59:55 EST

* Remove NO_DWARF (replaced by CONFIG_LIBDWARF)
* Remove HAVE_DWARF_SUPPORT (replaced by CONFIG_LIBDWARF)
* Remove the useless variable PERF_HAVE_DWARF_REGS
* fix compilation issues if PERF_REGS is disabled

Signed-off-by: Alexis Berlemont <alexis.berlemont@xxxxxxxxx>
---

Changes since v1:
* Add the config parameter SKIP_CALLCHAIN_IDX
* Fix LIBDWARF_UNWIND directives

tools/perf/Kconfig | 59 +++++++++-
tools/perf/arch/arm/tests/Kbuild | 2 +-
tools/perf/arch/arm/util/Kbuild | 4 +-
tools/perf/arch/arm64/util/Kbuild | 2 +-
tools/perf/arch/powerpc/util/Kbuild | 4 +-
tools/perf/arch/s390/util/Kbuild | 2 +-
tools/perf/arch/sh/util/Kbuild | 2 +-
tools/perf/arch/sparc/util/Kbuild | 2 +-
tools/perf/arch/x86/Kbuild | 1 +
tools/perf/arch/x86/Makefile | 8 +-
tools/perf/arch/x86/tests/Kbuild | 2 +-
tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +-
tools/perf/arch/x86/util/Kbuild | 3 +-
tools/perf/builtin-probe.c | 15 +--
tools/perf/builtin-record.c | 2 +-
tools/perf/config/Makefile | 170 +++++++++++++--------------
tools/perf/config/Makefile.fix-config | 8 --
tools/perf/config/Makefile.fix-legacy | 4 -
tools/perf/tests/Kbuild | 2 +
tools/perf/tests/builtin-test.c | 3 +-
tools/perf/tests/tests.h | 6 +-
tools/perf/util/Kbuild | 11 +-
tools/perf/util/callchain.c | 11 +-
tools/perf/util/callchain.h | 3 +-
tools/perf/util/include/dwarf-regs.h | 4 +-
tools/perf/util/machine.c | 3 +-
tools/perf/util/perf_regs.c | 2 -
tools/perf/util/probe-event.c | 6 +-
tools/perf/util/probe-finder.h | 5 +-
tools/perf/util/unwind-libunwind.c | 5 +-
tools/perf/util/unwind.h | 7 +-
31 files changed, 203 insertions(+), 157 deletions(-)

diff --git a/tools/perf/Kconfig b/tools/perf/Kconfig
index 2eaf3ca..54a194d 100644
--- a/tools/perf/Kconfig
+++ b/tools/perf/Kconfig
@@ -287,7 +287,6 @@ choice
these tasks, perf can rely on either the libelf library or a
minimal builtin support.

-
config LIBELF
bool "elf"
---help---
@@ -318,15 +317,51 @@ config LIBDWARF
bool "Dwarf (libdwarf)"
default y
---help---
- libdwarf
+ A library for parsing DWARF debug information.
+
+config LIBDWARF_DIR
+ string "libdwarf directory"
+ depends on LIBDWARF
+ ---help---
+ Directory holding the libdwarf dependency (headers +
+ libraries)
+
+config UNWIND
+ depends on (LIBELF && PERF_REGS)
+ bool "User space unwind callchains"
+ default y
+ ---help---
+ Enable call-chain unwinding of user-space application.
+
+choice UNWIND_DEPS
+ prompt "Unwind dependency"
+ depends on UNWIND
+ default LIBUNWIND

config LIBUNWIND
- depends on LIBELF
- bool "User space libunwind callchains"
+ depends on (LIBELF && PERF_REGS)
+ bool "Libunwind"
+ ---help---
+ Rely on libunwind post unwind support to determine the
+ call-chain of a user-space program. The library libunwind
+ supports all the architectures.
+
+config LIBDWARF_UNWIND
+ depends on (LIBDWARF && PERF_REGS && (ARCH = "x86" || ARCH = "arm"))
+ bool "Libdwarf unwind"
+ ---help---
+ Rely on lidw DWARF post unwind support to determine the
+ call-chain of a user-space program. So far there's only x86
+ and arm libdw unwind support merged in perf.
+
+endchoice
+
+config LIBUNWIND_DEBUG_FRAME
+ depends on LIBUNWIND
+ bool "libunwind debug frame"
default y
---help---
- The library libunwind provides a portable C API to determine
- the call-chain of a program.
+ libunwind debug frame

config LIBUNWIND_DIR
string "libunwind directory"
@@ -335,6 +370,18 @@ config LIBUNWIND_DIR
Directory holding the libuwind dependency (headers +
libraries).

+config SKIP_CALLCHAIN_IDX
+ depends on (LIBDWARF && ARCH = "powerpc")
+ bool "Skip unnecessary callchain entries thanks to Dwarf"
+ default y
+ ---help---
+ When saving the callchain on Power, the kernel
+ conservatively saves excess entries in the callchain. A few
+ of these entries are needed in some cases but not others. If
+ the unnecessary entries are not ignored, we end up with
+ duplicate arcs in the call-graphs. Use DWARF debug
+ information to skip over any unnecessary callchain entries.
+
config LIBNUMA
bool "Libnuma support"
default y
diff --git a/tools/perf/arch/arm/tests/Kbuild b/tools/perf/arch/arm/tests/Kbuild
index 1318ed0..f1d8426 100644
--- a/tools/perf/arch/arm/tests/Kbuild
+++ b/tools/perf/arch/arm/tests/Kbuild
@@ -1,2 +1,2 @@
obj-$(CONFIG_PERF_REGS) += regs_load.o
-obj-y += dwarf-unwind.o
+obj-$(CONFIG_LIBDWARF_UNWIND) += dwarf-unwind.o
diff --git a/tools/perf/arch/arm/util/Kbuild b/tools/perf/arch/arm/util/Kbuild
index c96666a..df195c0 100644
--- a/tools/perf/arch/arm/util/Kbuild
+++ b/tools/perf/arch/arm/util/Kbuild
@@ -1,3 +1,3 @@
-obj-y += dwarf-regs.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
obj-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
-obj-y += unwind-libdw.o
+obj-$(CONFIG_LIBDWARF_UNWIND) += unwind-libdw.o
diff --git a/tools/perf/arch/arm64/util/Kbuild b/tools/perf/arch/arm64/util/Kbuild
index 136bc86..bd35d10 100644
--- a/tools/perf/arch/arm64/util/Kbuild
+++ b/tools/perf/arch/arm64/util/Kbuild
@@ -1,2 +1,2 @@
-obj-y += dwarf-regs.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
obj-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
diff --git a/tools/perf/arch/powerpc/util/Kbuild b/tools/perf/arch/powerpc/util/Kbuild
index 244ff2c..f33f79d 100644
--- a/tools/perf/arch/powerpc/util/Kbuild
+++ b/tools/perf/arch/powerpc/util/Kbuild
@@ -1,3 +1,3 @@
obj-y += header.o
-obj-y += skip-callchain-idx.o
-obj-y += dwarf-regs.o
+obj-$(CONFIG_SKIP_CALLCHAIN_IDX) += skip-callchain-idx.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
diff --git a/tools/perf/arch/s390/util/Kbuild b/tools/perf/arch/s390/util/Kbuild
index 24e8ee7..73df1ff 100644
--- a/tools/perf/arch/s390/util/Kbuild
+++ b/tools/perf/arch/s390/util/Kbuild
@@ -1,2 +1,2 @@
obj-y += kvm-stat.o
-obj-y += dwarf-regs.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
diff --git a/tools/perf/arch/sh/util/Kbuild b/tools/perf/arch/sh/util/Kbuild
index 8e698ae..930ba99 100644
--- a/tools/perf/arch/sh/util/Kbuild
+++ b/tools/perf/arch/sh/util/Kbuild
@@ -1 +1 @@
-obj-y += dwarf-regs.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
diff --git a/tools/perf/arch/sparc/util/Kbuild b/tools/perf/arch/sparc/util/Kbuild
index 8e698ae..930ba99 100644
--- a/tools/perf/arch/sparc/util/Kbuild
+++ b/tools/perf/arch/sparc/util/Kbuild
@@ -1 +1 @@
-obj-y += dwarf-regs.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
diff --git a/tools/perf/arch/x86/Kbuild b/tools/perf/arch/x86/Kbuild
index 52fd6fa..f5581bee 100644
--- a/tools/perf/arch/x86/Kbuild
+++ b/tools/perf/arch/x86/Kbuild
@@ -1 +1,2 @@
obj-y += util/
+obj-y += tests/
diff --git a/tools/perf/arch/x86/Makefile b/tools/perf/arch/x86/Makefile
index 9b21881..af36aad 100644
--- a/tools/perf/arch/x86/Makefile
+++ b/tools/perf/arch/x86/Makefile
@@ -1,14 +1,12 @@
-ifndef NO_DWARF
+ifeq ($(LIBDWARF), 1)
PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
-ifndef NO_LIBUNWIND
+ifeq ($(LIBUNWIND), 1)
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
endif
-ifndef NO_LIBDW_DWARF_UNWIND
+ifeq ($(LIBDWARF_UNWIND), 1)
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o
-endif
-ifndef NO_DWARF_UNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
endif
diff --git a/tools/perf/arch/x86/tests/Kbuild b/tools/perf/arch/x86/tests/Kbuild
index 8287dae..6d06051 100644
--- a/tools/perf/arch/x86/tests/Kbuild
+++ b/tools/perf/arch/x86/tests/Kbuild
@@ -1,3 +1,3 @@
obj-y += perf-time-to-tsc.o
obj-$(CONFIG_PERF_REGS) += regs_load.o
-obj-y += dwarf-unwind.o
+obj-$(CONFIG_LIBDWARF_UNWIND) += dwarf-unwind.o
diff --git a/tools/perf/arch/x86/tests/perf-time-to-tsc.c b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
index f238442..4fff792 100644
--- a/tools/perf/arch/x86/tests/perf-time-to-tsc.c
+++ b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
@@ -9,7 +9,7 @@
#include "thread_map.h"
#include "cpumap.h"
#include "tsc.h"
-#include "tests.h"
+#include "tests/tests.h"

#define CHECK__(x) { \
while ((x) < 0) { \
diff --git a/tools/perf/arch/x86/util/Kbuild b/tools/perf/arch/x86/util/Kbuild
index c7b86c0..adca885 100644
--- a/tools/perf/arch/x86/util/Kbuild
+++ b/tools/perf/arch/x86/util/Kbuild
@@ -1,5 +1,6 @@
-obj-y += dwarf-regs.o
obj-y += header.o
obj-y += tsc.o
obj-y += kvm-stat.o
+obj-$(CONFIG_LIBDWARF) += dwarf-regs.o
obj-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
+obj-$(CONFIG_LIBDWARF_UNWIND) += unwind-libdw.o
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 04412b4..0a00a4d 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -30,6 +30,7 @@
#include <stdlib.h>
#include <string.h>

+#include "generated/autoconf.h"
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
@@ -180,7 +181,7 @@ static int opt_set_target(const struct option *opt, const char *str,
if (str && !params.target) {
if (!strcmp(opt->long_name, "exec"))
params.uprobes = true;
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
else if (!strcmp(opt->long_name, "module"))
params.uprobes = false;
#endif
@@ -206,7 +207,7 @@ static int opt_set_target(const struct option *opt, const char *str,
return ret;
}

-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
static int opt_show_lines(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
@@ -306,7 +307,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
"perf probe [<options>] --line 'LINEDESC'",
"perf probe [<options>] --vars 'PROBEPOINT'",
#endif
@@ -320,7 +321,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
" [[NAME=]ARG ...]",
#else
@@ -332,7 +333,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"\t\tFUNC:\tFunction name\n"
"\t\tOFF:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
"\t\tSRC:\tSource code path\n"
"\t\tRL:\tRelative line number from function entry.\n"
"\t\tAL:\tAbsolute line number in file.\n"
@@ -345,7 +346,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
opt_add_probe_event),
OPT_BOOLEAN('f', "force", &params.force_add, "forcibly add events"
" with existing name"),
-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
OPT_CALLBACK('L', "line", NULL,
"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
"Show source code lines.", opt_show_lines),
@@ -460,7 +461,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
return ret;
}

-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF
if (params.show_lines) {
if (params.mod_events) {
pr_err(" Error: Don't use --line with"
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index dbba96c..bf56425 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -714,7 +714,7 @@ static struct record record = {

#define CALLCHAIN_HELP "setup and enables call-graph (stack chain/backtrace) recording: "

-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
const char record_callchain_help[] = CALLCHAIN_HELP "fp dwarf";
#else
const char record_callchain_help[] = CALLCHAIN_HELP "fp";
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 79fe047..f667229 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -34,23 +34,16 @@ ifeq ($(ARCH),arm64)
LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
endif

-# So far there's only x86 and arm libdw unwind support merged in perf.
-# Disable it on all other architectures in case libdw unwind
-# support is detected in system. Add supported architectures
-# to the check.
-ifneq ($(ARCH),$(filter $(ARCH),x86 arm))
- NO_LIBDW_DWARF_UNWIND := 1
-endif
-
ifeq ($(LIBUNWIND_LIBS),)
- NO_LIBUNWIND := 1
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBUNWIND)
else
+ LIBUNWIND = 1
#
# For linking with debug library, run like:
#
# make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/
#
- ifdef LIBUNWIND_DIR
+ ifdef CONFIG_LIBUNWIND_DIR
LIBUNWIND_CFLAGS = -I$(LIBUNWIND_DIR)/include
LIBUNWIND_LDFLAGS = -L$(LIBUNWIND_DIR)/lib
endif
@@ -63,12 +56,10 @@ else
FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS)
endif

-ifndef NO_LIBELF
- # for linking with debug library, run like:
- # make DEBUG=1 LIBDW_DIR=/opt/libdw/
- ifdef LIBDW_DIR
- LIBDW_CFLAGS := -I$(LIBDW_DIR)/include
- LIBDW_LDFLAGS := -L$(LIBDW_DIR)/lib
+ifdef CONFIG_LIBELF
+ ifdef CONFIG_LIBDWARF_DIR
+ LIBDW_CFLAGS := -I$(CONFIG_LIBDWARF_DIR)/include
+ LIBDW_LDFLAGS := -L$(CONFIG_LIBDWARF_DIR)/lib
endif
FEATURE_CHECK_CFLAGS-libdw-dwarf-unwind := $(LIBDW_CFLAGS)
FEATURE_CHECK_LDFLAGS-libdw-dwarf-unwind := $(LIBDW_LDFLAGS) -ldw
@@ -325,16 +316,22 @@ ifdef CONFIG_LIBELF
endif
else
LIBELF = 1
- ifndef NO_LIBDW_DWARF_UNWIND
- ifneq ($(feature-libdw-dwarf-unwind),1)
- NO_LIBDW_DWARF_UNWIND := 1
- msg := $(warning No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR);
- endif
- endif
- ifneq ($(feature-dwarf), 1)
- msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
- NO_DWARF := 1
- endif # Dwarf support
+ ifdef CONFIG_LIBDWARF
+ ifneq ($(feature-dwarf), 1)
+ msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBDWARF)
+ else
+ LIBDWARF = 1
+ endif # Dwarf support
+ ifdef CONFIG_LIBDWARF_UNWIND
+ ifneq ($(feature-libdw-dwarf-unwind),1)
+ msg := $(warning No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set CONFIG_LIBDWARF_DIR);
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBDWARF_UNWIND)
+ else
+ LIBDWARF_UNWIND = 1
+ endif # Dwarf unwind support detected
+ endif # CONFIG_LIBDWARF_UNWIND
+ endif # CONFIG_LIBDWARF
endif # libelf support
endif # CONFIG_LIBELF

@@ -355,72 +352,75 @@ ifeq ($(LIBELF), 1)
# include ARCH specific config
-include $(src-perf)/arch/$(ARCH)/Makefile

- ifndef NO_DWARF
- ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
- msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
- NO_DWARF := 1
- else
- CFLAGS += -DHAVE_DWARF_SUPPORT $(LIBDW_CFLAGS)
- LDFLAGS += $(LIBDW_LDFLAGS)
- EXTLIBS += -lelf -ldw
- endif # PERF_HAVE_DWARF_REGS
- endif # NO_DWARF
+ ifeq ($(LIBDWARF), 1)
+ CFLAGS += $(LIBDW_CFLAGS)
+ LDFLAGS += $(LIBDW_LDFLAGS)
+ EXTLIBS += -lelf -ldw
+ endif # LIBDWARF
endif # LIBELF

-ifeq ($(ARCH),powerpc)
- ifndef NO_DWARF
- CFLAGS += -DHAVE_SKIP_CALLCHAIN_IDX
- endif
-endif
-
-ifndef NO_LIBUNWIND
- ifneq ($(feature-libunwind), 1)
- msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
- NO_LIBUNWIND := 1
+ifdef CONFIG_UNWIND
+ # CONFIG_LIBUNWIND is the default choice; so, if it is not
+ # available, let's try another one
+ ifdef CONFIG_LIBUNWIND
+ ifeq ($(LIBUNWIND), 1)
+ ifneq ($(feature-libunwind), 1)
+ LIBUNWIND = 0
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBUNWIND)
+ ifeq ($(LIBDWARF_UNWIND), 1)
+ msg := $(warning No libunwind found, post unwind will rely on libdwarf-unwind. Please install libunwind-dev[el] >= 1.1);
+ $(shell $(KCONFIG_SCRIPT) -e CONFIG_LIBDWARF_UNWIND)
+ else
+ msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1);
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_UNWIND)
+ endif # LIBDWARF_UNWIND
+ else # feature-libunwind OK
+ EXTLIBS += $(LIBUNWIND_LIBS)
+ CFLAGS += $(LIBUNWIND_CFLAGS)
+ LDFLAGS += $(LIBUNWIND_LDFLAGS)
+ endif # feature-libunwind
+ endif # LIBUNWIND
+ endif # CONFIG_LIBUNWIND
+
+ # CONFIG_LIBDWARF_UNWIND is not the default choice (so the user's
+ # choice); so, we disable CONFIG_UNWIND if it is not available
+ ifdef CONFIG_LIBDWARF_UNWIND
+ ifneq ($(LIBDWARF_UNWIND), 1)
+ msg := $(warning Disabling post unwing because (libdwarf-unwind is not available));
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_UNWIND)
+ endif
+ endif # CONFIG_LIBDWARF_UNWIND
+
+ # if libunwind is OK, let's check the option DEBUG_FRAME
+ ifdef CONFIG_LIBUNWIND
+ ifeq ($(LIBUNWIND), 1)
+ ifeq ($(ARCH),$(filter $(ARCH),arm arm64))
+ $(call feature_check,libunwind-debug-frame)
+ ifneq ($(feature-libunwind-debug-frame), 1)
+ msg := $(warning No debug_frame support found in libunwind);
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBUNWIND_DEBUG_FRAME)
+ endif
+ else
+ # non-ARM has no dwarf_find_debug_frame() function:
+ $(shell $(KCONFIG_SCRIPT) -d CONFIG_LIBUNWIND_DEBUG_FRAME)
+ endif
+ endif
endif
-endif

-dwarf-post-unwind := 1
-dwarf-post-unwind-text := BUG
+dwarf-post-unwind = 0
+dwarf-post-unwind-text = BUG

-# setup DWARF post unwinder
-ifdef NO_LIBUNWIND
- ifdef NO_LIBDW_DWARF_UNWIND
- msg := $(warning Disabling post unwind, no support found.);
- dwarf-post-unwind := 0
- else
- dwarf-post-unwind-text := libdw
- endif
-else
+ifeq ($(LIBUNWIND), 1)
+ dwarf-post-unwind := 1
dwarf-post-unwind-text := libunwind
- # Enable libunwind support by default.
- ifndef NO_LIBDW_DWARF_UNWIND
- NO_LIBDW_DWARF_UNWIND := 1
- endif
-endif
-
-ifeq ($(dwarf-post-unwind),1)
- CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT
else
- NO_DWARF_UNWIND := 1
-endif
-
-ifndef NO_LIBUNWIND
- ifeq ($(ARCH),$(filter $(ARCH),arm arm64))
- $(call feature_check,libunwind-debug-frame)
- ifneq ($(feature-libunwind-debug-frame), 1)
- msg := $(warning No debug_frame support found in libunwind);
- CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
- endif
- else
- # non-ARM has no dwarf_find_debug_frame() function:
- CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
+ ifeq ($(LIBDWARF_UNWIND), 1)
+ dwarf-post-unwind := 1
+ dwarf-post-unwind-text := libdw
endif
- CFLAGS += -DHAVE_LIBUNWIND_SUPPORT
- EXTLIBS += $(LIBUNWIND_LIBS)
- CFLAGS += $(LIBUNWIND_CFLAGS)
- LDFLAGS += $(LIBUNWIND_LDFLAGS)
-endif
+endif # LIBUNWIND
+
+endif # CONFIG_UNWIND

ifdef CONFIG_LIBAUDIT
ifneq ($(feature-libaudit), 1)
@@ -783,8 +783,6 @@ all:
$(call store,NO_LIBUNWIND)
$(call store,NO_LIBPERL)
$(call store,NO_LIBPYTHON)
- $(call store,NO_LIBUNWIND)
- $(call store,NO_LIBBIONIC)
$(call store,ETC_PERFCONFIG_SQ)
$(call store,DESTDIR_SQ)
$(call store,bindir_SQ)
diff --git a/tools/perf/config/Makefile.fix-config b/tools/perf/config/Makefile.fix-config
index 99948b7..e63539f 100644
--- a/tools/perf/config/Makefile.fix-config
+++ b/tools/perf/config/Makefile.fix-config
@@ -19,12 +19,4 @@ dummy := $(shell $(CONFIG) -d CONFIG_LIBPYTHON)
endif
endif

-# NO_LIBUNWIND
-ifdef CONFIG_LIBUNWIND
-ifdef NO_LIBUNWIND
-dummy := $(info Disabling CONFIG_LIBUNWIND)
-dummy := $(shell $(CONFIG) -d CONFIG_LIBUNWIND)
-endif
-endif
-
all:
diff --git a/tools/perf/config/Makefile.fix-legacy b/tools/perf/config/Makefile.fix-legacy
index 8568d37..20a4062 100644
--- a/tools/perf/config/Makefile.fix-legacy
+++ b/tools/perf/config/Makefile.fix-legacy
@@ -8,7 +8,3 @@ endif
ifndef CONFIG_LIBPYTHON
NO_LIBPYTHON := 1
endif
-
-ifndef CONFIG_LIBUNWIND
-NO_LIBUNWIND := 1
-endif
diff --git a/tools/perf/tests/Kbuild b/tools/perf/tests/Kbuild
index 9f56ce8..f362620 100644
--- a/tools/perf/tests/Kbuild
+++ b/tools/perf/tests/Kbuild
@@ -31,6 +31,8 @@ obj-y += hists_cumulate.o
obj-y += hists_common.o
obj-y += hists_filter.o

+obj-$(LIBDWARF_UNWIND) += dwarf-unwind.o
+
CFLAGS_python-use.o += -D"PYTHON=KBUILD_STR($(PYTHON_WORD))"
CFLAGS_python-use.o += -D"PYTHONPATH=KBUILD_STR(python)"

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 162c978..e3e21b1 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -5,6 +5,7 @@
*/
#include <unistd.h>
#include <string.h>
+#include "generated/autoconf.h"
#include "builtin.h"
#include "hist.h"
#include "intlist.h"
@@ -127,7 +128,7 @@ static struct test {
.func = test__parse_no_sample_id_all,
},
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
{
.desc = "Test dwarf unwind",
.func = test__dwarf_unwind,
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 00e776a..a14555d 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -1,6 +1,8 @@
#ifndef TESTS_H
#define TESTS_H

+#include "generated/autoconf.h"
+
#define TEST_ASSERT_VAL(text, cond) \
do { \
if (!(cond)) { \
@@ -52,12 +54,10 @@ int test__switch_tracking(void);
int test__fdarray__filter(void);
int test__fdarray__add(void);

-#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
struct thread;
struct perf_sample;
int test__arch_unwind_sample(struct perf_sample *sample,
struct thread *thread);
#endif
-#endif
#endif /* TESTS_H */
diff --git a/tools/perf/util/Kbuild b/tools/perf/util/Kbuild
index 98526db..4dd3e41 100644
--- a/tools/perf/util/Kbuild
+++ b/tools/perf/util/Kbuild
@@ -49,16 +49,19 @@ obj-y += string.o
obj-y += strlist.o
obj-y += svghelper.o
obj-y += symbol.o
-obj-y += perf_regs.o
obj-y += tsc.o
obj-y += cloexec.o

-obj-$(CONFIG_LIBUNWIND) += unwind.o
+obj-$(CONFIG_PERF_REGS) += perf_regs.o
+
+obj-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
+obj-$(CONFIG_LIBDWARF_UNWIND) += unwind-libdw.o

obj-$(CONFIG_LIBELF) += symbol-elf.o
-obj-$(CONFIG_LIBELF) += dwarf-aux.o
obj-$(CONFIG_LIBELF) += probe-event.o
-obj-$(CONFIG_LIBELF) += probe-finder.o
+
+obj-$(CONFIG_LIBDWARF) += dwarf-aux.o
+obj-$(CONFIG_LIBDWARF) += probe-finder.o

obj-$(CONFIG_LIBELF_MINIMAL) += symbol-minimal.o

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index c84d3f8..b7c06b2 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -17,6 +17,7 @@

#include "asm/bug.h"

+#include "generated/autoconf.h"
#include "hist.h"
#include "util.h"
#include "sort.h"
@@ -25,7 +26,7 @@

__thread struct callchain_cursor callchain_cursor;

-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
static int get_stack_size(const char *str, unsigned long *_size)
{
char *endptr;
@@ -51,7 +52,7 @@ static int get_stack_size(const char *str, unsigned long *_size)
max_size, str);
return -1;
}
-#endif /* HAVE_DWARF_UNWIND_SUPPORT */
+#endif /* CONFIG_LIBDWARF_UNWIND */

int parse_callchain_record_opt(const char *arg)
{
@@ -80,7 +81,7 @@ int parse_callchain_record_opt(const char *arg)
"needed for -g fp\n");
break;

-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
/* Dwarf style */
} else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
const unsigned long default_stack_dump_size = 8192;
@@ -96,7 +97,7 @@ int parse_callchain_record_opt(const char *arg)
ret = get_stack_size(tok, &size);
callchain_param.dump_size = size;
}
-#endif /* HAVE_DWARF_UNWIND_SUPPORT */
+#endif /* CONFIG_LIBDWARF_UNWIND */
} else {
pr_err("callchain: Unknown --call-graph option "
"value: %s\n", arg);
@@ -208,7 +209,7 @@ int perf_callchain_config(const char *var, const char *value)

if (!strcmp(var, "record-mode"))
return parse_callchain_record_opt(value);
-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_LIBDWARF_UNWIND
if (!strcmp(var, "dump-size")) {
unsigned long size = 0;
int ret;
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 94cfefd..d9a9606 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -1,6 +1,7 @@
#ifndef __PERF_CALLCHAIN_H
#define __PERF_CALLCHAIN_H

+#include "generated/autoconf.h"
#include "../perf.h"
#include <linux/list.h>
#include <linux/rbtree.h>
@@ -183,7 +184,7 @@ static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
dest->nr -= src->pos;
}

-#ifdef HAVE_SKIP_CALLCHAIN_IDX
+#ifdef CONFIG_SKIP_CALLCHAIN_IDX
extern int arch_skip_callchain_idx(struct machine *machine,
struct thread *thread, struct ip_callchain *chain);
#else
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 8f14965..93cd69c 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -1,7 +1,9 @@
#ifndef _PERF_DWARF_REGS_H_
#define _PERF_DWARF_REGS_H_

-#ifdef HAVE_DWARF_SUPPORT
+#include "generated/autoconf.h"
+
+#ifdef CONFIG_LIBDWARF
const char *get_arch_regstr(unsigned int n);
#endif

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 34fc7c8..7804c6d 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1,3 +1,4 @@
+#include "generated/autoconf.h"
#include "callchain.h"
#include "debug.h"
#include "event.h"
@@ -1407,7 +1408,7 @@ static int machine__resolve_callchain_sample(struct machine *machine,
else
j = chain->nr - i - 1;

-#ifdef HAVE_SKIP_CALLCHAIN_IDX
+#ifdef CONFIG_SKIP_CALLCHAIN_IDX
if (j == skip_idx)
continue;
#endif
diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
index 01720b5..434f85b 100644
--- a/tools/perf/util/perf_regs.c
+++ b/tools/perf/util/perf_regs.c
@@ -3,7 +3,6 @@
#include "perf_regs.h"
#include "event.h"

-#ifdef CONFIG_PERF_REGS
int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
{
int i, idx = 0;
@@ -27,4 +26,3 @@ out:
*valp = regs->cache_regs[id];
return 0;
}
-#endif /* CONFIG_PERF_REGS */
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index c150ca4..d31d5d0 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -32,6 +32,7 @@
#include <limits.h>
#include <elf.h>

+#include "generated/autoconf.h"
#include "util.h"
#include "event.h"
#include "strlist.h"
@@ -256,8 +257,7 @@ static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
clear_probe_trace_event(tevs + i);
}

-#ifdef HAVE_DWARF_SUPPORT
-
+#ifdef CONFIG_LIBDWARF
/* Open new debuginfo of given module */
static struct debuginfo *open_debuginfo(const char *module, bool silent)
{
@@ -799,7 +799,7 @@ out:
return ret;
}

-#else /* !HAVE_DWARF_SUPPORT */
+#else /* !CONFIG_LIBDWARF */

static int
find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 92590b2..13cb054 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -2,6 +2,7 @@
#define _PROBE_FINDER_H

#include <stdbool.h>
+#include "generated/autoconf.h"
#include "util.h"
#include "intlist.h"
#include "probe-event.h"
@@ -16,7 +17,7 @@ static inline int is_c_varname(const char *name)
return isalpha(name[0]) || name[0] == '_';
}

-#ifdef HAVE_DWARF_SUPPORT
+#ifdef CONFIG_LIBDWARF

#include "dwarf-aux.h"

@@ -107,6 +108,6 @@ struct line_finder {
int found;
};

-#endif /* HAVE_DWARF_SUPPORT */
+#endif /* CONFIG_LIBDWARF */

#endif /*_PROBE_FINDER_H */
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index e060386..dd98eb3 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -24,6 +24,7 @@
#include <linux/list.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
+#include "generated/autoconf.h"
#include "callchain.h"
#include "thread.h"
#include "session.h"
@@ -261,7 +262,7 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
return ret;
}

-#ifndef NO_LIBUNWIND_DEBUG_FRAME
+#ifdef CONFIG_LIBUNWIND_DEBUG_FRAME
static int read_unwind_spec_debug_frame(struct dso *dso,
struct machine *machine, u64 *offset)
{
@@ -319,7 +320,7 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
need_unwind_info, arg);
}

-#ifndef NO_LIBUNWIND_DEBUG_FRAME
+#ifdef CONFIG_LIBUNWIND_DEBUG_FRAME
/* Check the .debug_frame section for unwinding info */
if (!read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
memset(&di, 0, sizeof(di));
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index c17c485..63fdf3c 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -2,6 +2,7 @@
#define __UNWIND_H

#include <linux/types.h>
+#include "generated/autoconf.h"
#include "event.h"
#include "symbol.h"
#include "thread.h"
@@ -14,13 +15,13 @@ struct unwind_entry {

typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);

-#ifdef HAVE_DWARF_UNWIND_SUPPORT
+#ifdef CONFIG_UNWIND
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct machine *machine,
struct thread *thread,
struct perf_sample *data, int max_stack);
/* libunwind specific */
-#ifdef HAVE_LIBUNWIND_SUPPORT
+#ifdef CONFIG_LIBUNWIND
int libunwind__arch_reg_id(int regnum);
int unwind__prepare_access(struct thread *thread);
void unwind__finish_access(struct thread *thread);
@@ -50,5 +51,5 @@ static inline int unwind__prepare_access(struct thread *thread __maybe_unused)
}

static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
-#endif /* HAVE_DWARF_UNWIND_SUPPORT */
+#endif /* CONFIG_UNWIND */
#endif /* __UNWIND_H */
--
2.1.1

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