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    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@infradead.org>
    AuthorDate: Tue, 08 Mar 2022 16:30:13 +01:00
    Committer: Peter Zijlstra <peterz@infradead.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@infradead.org>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    Reviewed-by: Miroslav Benes <mbenes@suse.cz>
    Acked-by: Josh Poimboeuf <jpoimboe@redhat.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[]);

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