linux-kernel - [tip: objtool/urgent] objtool/x86: Ignore __x86_indirect_alt

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Message-ID: <162429800985.395.5319249290550367396.tip-bot2@tip-bot2>
Date:   Mon, 21 Jun 2021 17:53:29 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] objtool/x86: Ignore __x86_indirect_alt_* symbols

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     31197d3a0f1caeb60fb01f6755e28347e4f44037
Gitweb:        https://git.kernel.org/tip/31197d3a0f1caeb60fb01f6755e28347e4f44037
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 21 Jun 2021 16:13:55 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 21 Jun 2021 17:26:57 +02:00

objtool/x86: Ignore __x86_indirect_alt_* symbols

Because the __x86_indirect_alt* symbols are just that, objtool will
try and validate them as regular symbols, instead of the alternative
replacements that they are.

This goes sideways for FRAME_POINTER=y builds; which generate a fair
amount of warnings.

Fixes: 9bc0bb50727c ("objtool/x86: Rewrite retpoline thunk calls")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/YNCgxwLBiK9wclYJ@hirez.programming.kicks-ass.net
---
 arch/x86/lib/retpoline.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 4d32cb0..ec9922c 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -58,12 +58,16 @@ SYM_FUNC_START_NOALIGN(__x86_indirect_alt_call_\reg)
 2:	.skip	5-(2b-1b), 0x90
 SYM_FUNC_END(__x86_indirect_alt_call_\reg)
 
+STACK_FRAME_NON_STANDARD(__x86_indirect_alt_call_\reg)
+
 SYM_FUNC_START_NOALIGN(__x86_indirect_alt_jmp_\reg)
 	ANNOTATE_RETPOLINE_SAFE
 1:	jmp	*%\reg
 2:	.skip	5-(2b-1b), 0x90
 SYM_FUNC_END(__x86_indirect_alt_jmp_\reg)
 
+STACK_FRAME_NON_STANDARD(__x86_indirect_alt_jmp_\reg)
+
 .endm
 
 /*