linux-kernel - [tip: x86/urgent] x86,xen,objtool: Add UNWIND hint

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Message-ID: <165039892316.4207.7405922361985895288.tip-bot2@tip-bot2>
Date:   Tue, 19 Apr 2022 20:08:43 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86,xen,objtool: Add UNWIND hint

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     2730d3c14a85617c177337f2e2af2108bf82c4ca
Gitweb:        https://git.kernel.org/tip/2730d3c14a85617c177337f2e2af2108bf82c4ca
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Fri, 08 Apr 2022 11:45:54 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 19 Apr 2022 21:58:47 +02:00

x86,xen,objtool: Add UNWIND hint

SYM_CODE_START*() doesn't get auto-validated and needs an UNWIND hint
to get checked, add one.

  vmlinux.o: warning: objtool: pvh_start_xen()+0x0: unreachable

Reported-by: Thomas Gleixner <tglx@...utronix.de>
Reported-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220408094718.321246297@infradead.org
---
 arch/x86/platform/pvh/head.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
index 72c1e42..7fe564e 100644
--- a/arch/x86/platform/pvh/head.S
+++ b/arch/x86/platform/pvh/head.S
@@ -50,6 +50,7 @@
 #define PVH_DS_SEL		(PVH_GDT_ENTRY_DS * 8)
 
 SYM_CODE_START_LOCAL(pvh_start_xen)
+	UNWIND_HINT_EMPTY
 	cld
 
 	lgdt (_pa(gdt))