linux-kernel - [PATCH 12/13] objtool: Provide stats for jump

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Message-ID: <20210506194158.153101906@infradead.org>
Date:   Thu, 06 May 2021 21:34:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, jpoimboe@...hat.com, jbaron@...mai.com,
        rostedt@...dmis.org, ardb@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH 12/13] objtool: Provide stats for jump_labels

Add objtool --stats to count the jump_label sites it encounters.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/check.c                   |   22 ++++++++++++++++++++--
 tools/objtool/include/objtool/objtool.h |    3 +++
 2 files changed, 23 insertions(+), 2 deletions(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1225,8 +1225,15 @@ static int handle_jump_alt(struct objtoo
 			   struct instruction *orig_insn,
 			   struct instruction **new_insn)
 {
-	if (orig_insn->type == INSN_NOP)
+	if (orig_insn->type == INSN_NOP) {
+do_nop:
+		if (orig_insn->len == 2)
+			file->jl_nop_short++;
+		else
+			file->jl_nop_long++;
+
 		return 0;
+	}
 
 	if (orig_insn->type != INSN_JUMP_UNCONDITIONAL) {
 		WARN_FUNC("unsupported instruction at jump label",
@@ -1245,9 +1252,14 @@ static int handle_jump_alt(struct objtoo
 			       orig_insn->offset, orig_insn->len,
 			       arch_nop_insn(orig_insn->len));
 		orig_insn->type = INSN_NOP;
-		return 0;
+		goto do_nop;
 	}
 
+	if (orig_insn->len == 2)
+		file->jl_short++;
+	else
+		file->jl_long++;
+
 	*new_insn = list_next_entry(orig_insn, list);
 	return 0;
 }
@@ -1328,6 +1340,12 @@ static int add_special_section_alts(stru
 		free(special_alt);
 	}
 
+	if (stats) {
+		printf("jl\\\tNOP\tJMP\n");
+		printf("short:\t%ld\t%ld\n", file->jl_nop_short, file->jl_short);
+		printf("long:\t%ld\t%ld\n", file->jl_nop_long, file->jl_long);
+	}
+
 out:
 	return ret;
 }
--- a/tools/objtool/include/objtool/objtool.h
+++ b/tools/objtool/include/objtool/objtool.h
@@ -22,6 +22,9 @@ struct objtool_file {
 	struct list_head static_call_list;
 	struct list_head mcount_loc_list;
 	bool ignore_unreachables, c_file, hints, rodata;
+
+	unsigned long jl_short, jl_long;
+	unsigned long jl_nop_short, jl_nop_long;
 };
 
 struct objtool_file *objtool_open_read(const char *_objname);