linux-kernel - [PATCH v4 34/45] objtool: Rename --duplicate to --lto

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Date:   Tue, 08 Mar 2022 16:30:45 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: [PATCH v4 34/45] objtool: Rename --duplicate to --lto

In order to prepare for LTO like objtool runs for modules, rename the
duplicate argument to lto.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 scripts/link-vmlinux.sh                 |    2 +-
 tools/objtool/builtin-check.c           |    4 ++--
 tools/objtool/check.c                   |    7 ++++++-
 tools/objtool/include/objtool/builtin.h |    2 +-
 4 files changed, 10 insertions(+), 5 deletions(-)

--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -115,7 +115,7 @@ objtool_link()
 			objtoolcmd="orc generate"
 		fi
 
-		objtoolopt="${objtoolopt} --duplicate"
+		objtoolopt="${objtoolopt} --lto"
 
 		if is_enabled CONFIG_FTRACE_MCOUNT_USE_OBJTOOL; then
 			objtoolopt="${objtoolopt} --mcount"
--- 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, dryrun;
+     lto, vmlinux, mcount, noinstr, backup, sls, dryrun;
 
 static const char * const check_usage[] = {
 	"objtool check [<options>] file.o",
@@ -40,7 +40,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
 	OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
 	OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
-	OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
+	OPT_BOOLEAN(0, "lto", &lto, "whole-archive like runs"),
 	OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
 	OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
 	OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3501,6 +3501,11 @@ int check(struct objtool_file *file)
 {
 	int ret, warnings = 0;
 
+	if (lto && !(vmlinux || module)) {
+		fprintf(stderr, "--lto requires: --vmlinux or --module\n");
+		return 1;
+	}
+
 	arch_initial_func_cfi_state(&initial_func_cfi);
 	init_cfi_state(&init_cfi);
 	init_cfi_state(&func_cfi);
@@ -3521,7 +3526,7 @@ int check(struct objtool_file *file)
 	if (list_empty(&file->insn_list))
 		goto out;
 
-	if (vmlinux && !validate_dup) {
+	if (vmlinux && !lto) {
 		ret = validate_vmlinux_functions(file);
 		if (ret < 0)
 			goto out;
--- 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, dryrun;
+	    lto, vmlinux, mcount, noinstr, backup, sls, dryrun;
 
 extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);