linux-kernel - [tip: x86/core] objtool: Add --dry-run

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Date:   Tue, 15 Mar 2022 10:44:16 -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>,
        Kees Cook <keescook@...omium.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] objtool: Add --dry-run

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

Commit-ID:     f2d3a250897133cc36c13a641bd6a9b4dd5ad234
Gitweb:        https://git.kernel.org/tip/f2d3a250897133cc36c13a641bd6a9b4dd5ad234
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:13 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:32 +01:00

objtool: Add --dry-run

Add a --dry-run argument to skip writing the modifications. This is
convenient for debugging.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220308154317.282720146@infradead.org
---
 tools/objtool/builtin-check.c           | 3 ++-
 tools/objtool/elf.c                     | 3 +++
 tools/objtool/include/objtool/builtin.h | 2 +-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 38070f2..853af93 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -20,7 +20,7 @@
 #include <objtool/objtool.h>
 
 bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
-     validate_dup, vmlinux, mcount, noinstr, backup, sls;
+     validate_dup, vmlinux, mcount, noinstr, backup, sls, dryrun;
 
 static const char * const check_usage[] = {
 	"objtool check [<options>] file.o",
@@ -46,6 +46,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
 	OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
 	OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"),
+	OPT_BOOLEAN(0, "dry-run", &dryrun, "don't write the modifications"),
 	OPT_END(),
 };
 
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 4b384c9..456ac22 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -1019,6 +1019,9 @@ int elf_write(struct elf *elf)
 	struct section *sec;
 	Elf_Scn *s;
 
+	if (dryrun)
+		return 0;
+
 	/* Update changed relocation sections and section headers: */
 	list_for_each_entry(sec, &elf->sections, list) {
 		if (sec->changed) {
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index 89ba869..7b4b124 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -9,7 +9,7 @@
 
 extern const struct option check_options[];
 extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
-            validate_dup, vmlinux, mcount, noinstr, backup, sls;
+            validate_dup, vmlinux, mcount, noinstr, backup, sls, dryrun;
 
 extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);