linux-kernel - [PATCH 1/2] objtool: Don't warn for intra function calls in alternative

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Date:   Mon, 12 Feb 2018 16:04:21 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     tglx@...utronix.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, bp@...en8.de,
        dwmw2@...radead.org, jpoimboe@...hat.com,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 1/2] objtool: Don't warn for intra function calls in alternative

From: Andi Kleen <ak@...ux.intel.com>

objtool suggests to put intra function calls, like used in
stuff rsb, into alternative, but then starts warning about the
alternative section too. Avoid these warnings.

Needed for the next patch.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/objtool/check.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2e458eb45586..ec46db0dcdc0 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -544,7 +544,8 @@ static int add_call_destinations(struct objtool_file *file)
 			insn->call_dest = find_symbol_by_offset(insn->sec,
 								dest_off);
 
-			if (!insn->call_dest && !insn->ignore) {
+			if (!insn->call_dest && !insn->ignore &&
+			    strcmp(insn->sec->name, ".altinstr_replacement")) {
 				WARN_FUNC("unsupported intra-function call",
 					  insn->sec, insn->offset);
 				WARN("If this is a retpoline, please patch it in with alternatives and annotate it with ANNOTATE_NOSPEC_ALTERNATIVE.");
-- 
2.14.3