linux-kernel - [PATCH] x86/tdx: Annotate a noreturn function

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Message-Id: <20220420115025.5448-1-bp@alien8.de>
Date:   Wed, 20 Apr 2022 13:50:25 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/tdx: Annotate a noreturn function

From: Borislav Petkov <bp@...e.de>

objdump complains:

  vmlinux.o: warning: objtool: __tdx_hypercall()+0x74: unreachable instruction

because __tdx_hypercall_failed() won't return but panic the guest.
Annotate that that is ok and desired.

Fixes: eb94f1b6a70a ("x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions")
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/coco/tdx/tdcall.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/coco/tdx/tdcall.S b/arch/x86/coco/tdx/tdcall.S
index 245888290bb6..eeb4511dc414 100644
--- a/arch/x86/coco/tdx/tdcall.S
+++ b/arch/x86/coco/tdx/tdcall.S
@@ -200,5 +200,6 @@ SYM_FUNC_START(__tdx_hypercall)
 .Lpanic:
 	call __tdx_hypercall_failed
 	/* __tdx_hypercall_failed never returns */
+	REACHABLE
 	jmp .Lpanic
 SYM_FUNC_END(__tdx_hypercall)
-- 
2.35.1