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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2019-05-13 20:01:31 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-05-13 21:31:17 +0300 |
| commit | e6da9567959e164f82bc81967e0d5b10dee870b4 (patch) | |
| tree | ff37fe29d3446f220a9a8fb5623dccf962670d53 /tools/objtool | |
| parent | 82045dd85566d87128dcc66277cf1177d9930a4a (diff) | |
| download | linux-e6da9567959e164f82bc81967e0d5b10dee870b4.tar.xz | |
objtool: Don't use ignore flag for fake jumps
The ignore flag is set on fake jumps in order to keep
add_jump_destinations() from setting their jump_dest, since it already
got set when the fake jump was created.
But using the ignore flag is a bit of a hack. It's normally used to
skip validation of an instruction, which doesn't really make sense for
fake jumps.
Also, after the next patch, using the ignore flag for fake jumps can
trigger a false "why am I validating an ignored function?" warning.
Instead just add an explicit check in add_jump_destinations() to skip
fake jumps.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/71abc072ff48b2feccc197723a9c52859476c068.1557766718.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/check.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index ac743a1d53ab..90226791df6b 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -28,6 +28,8 @@ #include <linux/hashtable.h> #include <linux/kernel.h> +#define FAKE_JUMP_OFFSET -1 + struct alternative { struct list_head list; struct instruction *insn; @@ -568,7 +570,7 @@ static int add_jump_destinations(struct objtool_file *file) insn->type != INSN_JUMP_UNCONDITIONAL) continue; - if (insn->ignore) + if (insn->ignore || insn->offset == FAKE_JUMP_OFFSET) continue; rela = find_rela_by_dest_range(insn->sec, insn->offset, @@ -745,10 +747,10 @@ static int handle_group_alt(struct objtool_file *file, clear_insn_state(&fake_jump->state); fake_jump->sec = special_alt->new_sec; - fake_jump->offset = -1; + fake_jump->offset = FAKE_JUMP_OFFSET; fake_jump->type = INSN_JUMP_UNCONDITIONAL; fake_jump->jump_dest = list_next_entry(last_orig_insn, list); - fake_jump->ignore = true; + fake_jump->func = orig_insn->func; } if (!special_alt->new_len) { |