linux-kernel - [tip: x86/core] objtool: Track init section

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Date:   Mon, 17 Oct 2022 14:54:01 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] objtool: Track init section

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     6644ee846cb983437063da8fd24b7cae671fd019
Gitweb:        https://git.kernel.org/tip/6644ee846cb983437063da8fd24b7cae671fd019
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Thu, 15 Sep 2022 13:11:08 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:07 +02:00

objtool: Track init section

For future usage of .init.text exclusion track the init section in the
instruction decoder and use the result in retpoline validation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20220915111145.910334431@infradead.org
---
 tools/objtool/check.c               | 17 ++++++++++-------
 tools/objtool/include/objtool/elf.h |  2 +-
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 7174bba..bb7c819 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -382,6 +382,15 @@ static int decode_instructions(struct objtool_file *file)
 		    !strncmp(sec->name, ".text.__x86.", 12))
 			sec->noinstr = true;
 
+		/*
+		 * .init.text code is ran before userspace and thus doesn't
+		 * strictly need retpolines, except for modules which are
+		 * loaded late, they very much do need retpoline in their
+		 * .init.text
+		 */
+		if (!strcmp(sec->name, ".init.text") && !opts.module)
+			sec->init = true;
+
 		for (offset = 0; offset < sec->sh.sh_size; offset += insn->len) {
 			insn = malloc(sizeof(*insn));
 			if (!insn) {
@@ -3748,13 +3757,7 @@ static int validate_retpoline(struct objtool_file *file)
 		if (insn->retpoline_safe)
 			continue;
 
-		/*
-		 * .init.text code is ran before userspace and thus doesn't
-		 * strictly need retpolines, except for modules which are
-		 * loaded late, they very much do need retpoline in their
-		 * .init.text
-		 */
-		if (!strcmp(insn->sec->name, ".init.text") && !opts.module)
+		if (insn->sec->init)
 			continue;
 
 		if (insn->type == INSN_RETURN) {
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 16f4067..baa8085 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -38,7 +38,7 @@ struct section {
 	Elf_Data *data;
 	char *name;
 	int idx;
-	bool changed, text, rodata, noinstr;
+	bool changed, text, rodata, noinstr, init;
 };
 
 struct symbol {