linux-kernel - [PATCH v3 4/8] tools perf: Fix compilation error with new binutils

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Date:   Sun, 31 Jul 2022 18:38:30 -0700
From:   Andres Freund <andres@...razel.de>
To:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Quentin Monnet <quentin@...valent.com>,
        Ben Hutchings <benh@...ian.org>
Subject: [PATCH v3 4/8] tools perf: Fix compilation error with new binutils

binutils changed the signature of init_disassemble_info(), which now causes
compilation failures for tools/perf/util/annotate.c, e.g. on debian
unstable. Relevant binutils commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07

Wire up the feature test and switch to init_disassemble_info_compat(),
which were introduced in prior commits, fixing the compilation failure.

I verified that perf can still disassemble bpf programs by using bpftrace
under load, recording a perf trace, and then annotating the bpf "function"
with and without the changes. With old binutils there's no change in output
before/after this patch. When comparing the output from old binutils (2.35)
to new bintuils with the patch (upstream snapshot) there are a few output
differences, but they are unrelated to this patch. An example hunk is:

     1.15 :   55:mov    %rbp,%rdx
     0.00 :   58:add    $0xfffffffffffffff8,%rdx
     0.00 :   5c:xor    %ecx,%ecx
-    1.03 :   5e:callq  0xffffffffe12aca3c
+    1.03 :   5e:call   0xffffffffe12aca3c
     0.00 :   63:xor    %eax,%eax
-    2.18 :   65:leaveq
-    2.82 :   66:retq
+    2.18 :   65:leave
+    2.82 :   66:ret

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Sedat Dilek <sedat.dilek@...il.com>
Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
Signed-off-by: Andres Freund <andres@...razel.de>
---
 tools/perf/Makefile.config | 8 ++++++++
 tools/perf/util/annotate.c | 7 ++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 73e0762092fe..ee417c321adb 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -298,6 +298,7 @@ FEATURE_CHECK_LDFLAGS-libpython := $(PYTHON_EMBED_LDOPTS)
 FEATURE_CHECK_LDFLAGS-libaio = -lrt
 
 FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes -ldl
+FEATURE_CHECK_LDFLAGS-disassembler-init-styled = -lbfd -lopcodes -ldl
 
 CORE_CFLAGS += -fno-omit-frame-pointer
 CORE_CFLAGS += -ggdb3
@@ -905,13 +906,16 @@ ifndef NO_LIBBFD
     ifeq ($(feature-libbfd-liberty), 1)
       EXTLIBS += -lbfd -lopcodes -liberty
       FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -ldl
+      FEATURE_CHECK_LDFLAGS-disassembler-init-styled += -liberty -ldl
     else
       ifeq ($(feature-libbfd-liberty-z), 1)
         EXTLIBS += -lbfd -lopcodes -liberty -lz
         FEATURE_CHECK_LDFLAGS-disassembler-four-args += -liberty -lz -ldl
+        FEATURE_CHECK_LDFLAGS-disassembler-init-styled += -liberty -lz -ldl
       endif
     endif
     $(call feature_check,disassembler-four-args)
+    $(call feature_check,disassembler-init-styled)
   endif
 
   ifeq ($(feature-libbfd-buildid), 1)
@@ -1025,6 +1029,10 @@ ifeq ($(feature-disassembler-four-args), 1)
     CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
 endif
 
+ifeq ($(feature-disassembler-init-styled), 1)
+    CFLAGS += -DDISASM_INIT_STYLED
+endif
+
 ifeq (${IS_64_BIT}, 1)
   ifndef NO_PERF_READ_VDSO32
     $(call feature_check,compile-32)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 82cc396ef516..2c6a485c3de5 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1720,6 +1720,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
 #include <bpf/btf.h>
 #include <bpf/libbpf.h>
 #include <linux/btf.h>
+#include <tools/dis-asm-compat.h>
 
 static int symbol__disassemble_bpf(struct symbol *sym,
 				   struct annotate_args *args)
@@ -1762,9 +1763,9 @@ static int symbol__disassemble_bpf(struct symbol *sym,
 		ret = errno;
 		goto out;
 	}
-	init_disassemble_info(&info, s,
-			      (fprintf_ftype) fprintf);
-
+	init_disassemble_info_compat(&info, s,
+				     (fprintf_ftype) fprintf,
+				     fprintf_styled);
 	info.arch = bfd_get_arch(bfdf);
 	info.mach = bfd_get_mach(bfdf);
 
-- 
2.37.0.3.g30cc8d0f14