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authorJosh Poimboeuf <jpoimboe@redhat.com>2019-05-13 12:01:31 -0500
committerIngo Molnar <mingo@kernel.org>2019-05-13 20:31:17 +0200
commite6da9567959e164f82bc81967e0d5b10dee870b4 (patch)
treeff37fe29d3446f220a9a8fb5623dccf962670d53 /tools/objtool
parent82045dd85566d87128dcc66277cf1177d9930a4a (diff)
downloadlinux-e6da9567959e164f82bc81967e0d5b10dee870b4.tar.bz2
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.c8
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) {