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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-03-26 16:12:14 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-04-02 12:46:57 +0200 |
| commit | 50e7b4a1a1b264fc7df0698f2defb93cadf19a7b (patch) | |
| tree | 7c84a755063937046a0a50f137d4bc2e4c3840a1 /tools/objtool | |
| parent | objtool: Cache instruction relocs (diff) | |
| download | linux-dev-50e7b4a1a1b264fc7df0698f2defb93cadf19a7b.tar.xz linux-dev-50e7b4a1a1b264fc7df0698f2defb93cadf19a7b.zip | |
objtool: Skip magical retpoline .altinstr_replacement
When the .altinstr_replacement is a retpoline, skip the alternative.
We already special case retpolines anyway.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151300.259429287@infradead.org
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/special.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/tools/objtool/special.c b/tools/objtool/special.c index 2c7fbda7b055..07b21cfabf5c 100644 --- a/tools/objtool/special.c +++ b/tools/objtool/special.c @@ -106,6 +106,14 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry, return -1; } + /* + * Skip retpoline .altinstr_replacement... we already rewrite the + * instructions for retpolines anyway, see arch_is_retpoline() + * usage in add_{call,jump}_destinations(). + */ + if (arch_is_retpoline(new_reloc->sym)) + return 1; + alt->new_sec = new_reloc->sym->sec; alt->new_off = (unsigned int)new_reloc->addend; @@ -154,7 +162,9 @@ int special_get_alts(struct elf *elf, struct list_head *alts) memset(alt, 0, sizeof(*alt)); ret = get_alt_entry(elf, entry, sec, idx, alt); - if (ret) + if (ret > 0) + continue; + if (ret < 0) return ret; list_add_tail(&alt->list, alts); |