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Message-Id: <20241031014252.753588-12-irogers@google.com>
Date: Wed, 30 Oct 2024 18:42:42 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>,
Howard Chu <howardchu95@...il.com>, Athira Jajeev <atrajeev@...ux.vnet.ibm.com>,
Michael Petlan <mpetlan@...hat.com>, Veronika Molnarova <vmolnaro@...hat.com>,
Dapeng Mi <dapeng1.mi@...ux.intel.com>, Thomas Richter <tmricht@...ux.ibm.com>,
Ilya Leoshkevich <iii@...ux.ibm.com>, Colin Ian King <colin.i.king@...il.com>,
Weilin Wang <weilin.wang@...el.com>, Andi Kleen <ak@...ux.intel.com>,
Josh Poimboeuf <jpoimboe@...hat.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: [PATCH v5 11/21] perf x86: Define arch_fetch_insn in NO_AUXTRACE builds
archinsn.c containing arch_fetch_insn was only enabled with
CONFIG_AUXTRACE, but this meant that a NO_AUXTRACE build on x86 would
use the empty weak version of arch_fetch_insn - weak symbols are a
frequent source of errors like this and are outside of the C
specification. Change it so that archinsn.c is always built on x86 and
make the weak symbol empty version of arch_fetch_insn a strong one
guarded by ifdefs.
arch_fetch_insn on x86 depends on insn_decode which is a function
included then built into
intel-pt-insn-decoder.c. intel-pt-insn-decoder.c isn't built in a
NO_AUXTRACE=1 build. Separate the insn_decode function from
intel-pt-insn-decoder.c by just directly compiling the relevant
file. Guard this compilation to be for either always on x86 (because
of the use in arch_fetch_insn) or when auxtrace is enabled. Apply the
CFLAGS overrides as necessary, reducing the amount of code where
warnings are disabled.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/arch/x86/util/Build | 2 +-
tools/perf/util/Build | 2 +-
tools/perf/util/intel-pt-decoder/Build | 18 ++++++++++++++----
.../intel-pt-decoder/intel-pt-insn-decoder.c | 3 ---
tools/perf/util/trace-event-scripting.c | 4 +++-
5 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
index bc56a8e70f34..c5df4a2cf180 100644
--- a/tools/perf/arch/x86/util/Build
+++ b/tools/perf/arch/x86/util/Build
@@ -18,6 +18,6 @@ perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
-perf-util-$(CONFIG_AUXTRACE) += archinsn.o
+perf-util-y += archinsn.o
perf-util-$(CONFIG_AUXTRACE) += intel-pt.o
perf-util-$(CONFIG_AUXTRACE) += intel-bts.o
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 650974413849..340544a6f5ec 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -122,7 +122,7 @@ perf-util-y += iostat.o
perf-util-y += stream.o
perf-util-y += kvm-stat.o
perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
-perf-util-$(CONFIG_AUXTRACE) += intel-pt-decoder/
+perf-util-y += intel-pt-decoder/
perf-util-$(CONFIG_AUXTRACE) += intel-pt.o
perf-util-$(CONFIG_AUXTRACE) += intel-bts.o
perf-util-$(CONFIG_AUXTRACE) += arm-spe.o
diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
index 30793d08c6d4..f99d150059b9 100644
--- a/tools/perf/util/intel-pt-decoder/Build
+++ b/tools/perf/util/intel-pt-decoder/Build
@@ -9,14 +9,24 @@ $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_table
# Busybox's diff doesn't have -I, avoid warning in the case
-$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/intel-pt-insn-decoder.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
+ifeq ($(SRCARCH),x86)
+ perf-util-y += inat.o insn.o
+else
+ perf-util-$(CONFIG_AUXTRACE) += inat.o insn.o
+endif
+
+$(OUTPUT)util/intel-pt-decoder/inat.o: $(srctree)/tools/arch/x86/lib/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
-CFLAGS_intel-pt-insn-decoder.o += -I$(OUTPUT)util/intel-pt-decoder
+CFLAGS_inat.o += -I$(OUTPUT)util/intel-pt-decoder
+
+$(OUTPUT)util/intel-pt-decoder/insn.o: $(srctree)/tools/arch/x86/lib/insn.c
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
ifeq ($(CC_NO_CLANG), 1)
- CFLAGS_intel-pt-insn-decoder.o += -Wno-override-init
+ CFLAGS_insn.o += -Wno-override-init
endif
-CFLAGS_intel-pt-insn-decoder.o += -Wno-packed
+CFLAGS_insn.o += -Wno-packed
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
index 47cf35799a4d..8fabddc1c0da 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
@@ -11,9 +11,6 @@
#include <byteswap.h>
#include "../../../arch/x86/include/asm/insn.h"
-#include "../../../arch/x86/lib/inat.c"
-#include "../../../arch/x86/lib/insn.c"
-
#include "event.h"
#include "intel-pt-insn-decoder.h"
diff --git a/tools/perf/util/trace-event-scripting.c b/tools/perf/util/trace-event-scripting.c
index 2e9da0b089ef..8d71998a9ecd 100644
--- a/tools/perf/util/trace-event-scripting.c
+++ b/tools/perf/util/trace-event-scripting.c
@@ -272,11 +272,13 @@ void setup_perl_scripting(void)
#endif
#endif
-__weak void arch_fetch_insn(struct perf_sample *sample __maybe_unused,
+#if !defined(__i386__) && !defined(__x86_64__)
+void arch_fetch_insn(struct perf_sample *sample __maybe_unused,
struct thread *thread __maybe_unused,
struct machine *machine __maybe_unused)
{
}
+#endif
void script_fetch_insn(struct perf_sample *sample, struct thread *thread,
struct machine *machine, bool native_arch)
--
2.47.0.163.g1226f6d8fa-goog
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