From: Julien Thierry <jthierry@redhat.com>
Date: Fri, 27 Mar 2020 15:28:42 +0000
Subject: objtool: Remove check preventing branches within alternative
Git-commit: 9e98d62aa7ea1375052895650f3e6d362336c5c9
Patch-mainline: v5.8-rc1
References: bsc#1202396

While jumping from outside an alternative region to the middle of an
alternative region is very likely wrong, jumping from an alternative
region into the same region is valid. It is a common pattern on arm64.

The first pattern is unlikely to happen in practice and checking only
for this adds a lot of complexity.

Just remove the current check.

Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20200327152847.15294-6-jthierry@redhat.com

Acked-by: Miroslav Benes <mbenes@suse.cz>
---
 tools/objtool/check.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1850,12 +1850,6 @@ static int validate_branch(struct objtoo
 	insn = first;
 	sec = insn->sec;
 
-	if (insn->alt_group && list_empty(&insn->alts)) {
-		WARN_FUNC("don't know how to handle branch to middle of alternative instruction group",
-			  sec, insn->offset);
-		return 1;
-	}
-
 	while (1) {
 		next_insn = next_insn_same_sec(file, insn);