linux-kernel - [PATCH 5.10 267/575] objtool: Fix static

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Date:   Mon, 15 Nov 2021 17:59:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 267/575] objtool: Fix static_call list generation

From: Peter Zijlstra <peterz@...radead.org>

[ Upstream commit a958c4fea768d2c378c89032ab41d38da2a24422 ]

Currently, objtool generates tail call entries in add_jump_destination()
but waits until validate_branch() to generate the regular call entries.
Move these to add_call_destination() for consistency.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Link: https://lkml.kernel.org/r/20210326151259.691529901@infradead.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/objtool/check.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4261f93ce06f9..8932f41c387ff 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -954,6 +954,11 @@ static int add_call_destinations(struct objtool_file *file)
 		} else
 			insn->call_dest = reloc->sym;
 
+		if (insn->call_dest && insn->call_dest->static_call_tramp) {
+			list_add_tail(&insn->static_call_node,
+				      &file->static_call_list);
+		}
+
 		/*
 		 * Many compilers cannot disable KCOV with a function attribute
 		 * so they need a little help, NOP out any KCOV calls from noinstr
@@ -1668,6 +1673,9 @@ static int decode_sections(struct objtool_file *file)
 	if (ret)
 		return ret;
 
+	/*
+	 * Must be before add_{jump_call}_destination.
+	 */
 	ret = read_static_call_tramps(file);
 	if (ret)
 		return ret;
@@ -1680,6 +1688,10 @@ static int decode_sections(struct objtool_file *file)
 	if (ret)
 		return ret;
 
+	/*
+	 * Must be before add_call_destination(); it changes INSN_CALL to
+	 * INSN_JUMP.
+	 */
 	ret = read_intra_function_calls(file);
 	if (ret)
 		return ret;
@@ -2534,11 +2546,6 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 			if (dead_end_function(file, insn->call_dest))
 				return 0;
 
-			if (insn->type == INSN_CALL && insn->call_dest->static_call_tramp) {
-				list_add_tail(&insn->static_call_node,
-					      &file->static_call_list);
-			}
-
 			break;
 
 		case INSN_JUMP_CONDITIONAL:
-- 
2.33.0