linux-kernel - [PATCH] x86: coco: mark cc_mask as __maybe

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Message-Id: <20250304143340.928503-1-arnd@kernel.org>
Date: Tue,  4 Mar 2025 15:33:34 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Tom Lendacky <thomas.lendacky@....com>
Cc: Arnd Bergmann <arnd@...db.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: coco: mark cc_mask as __maybe_unused

From: Arnd Bergmann <arnd@...db.de>

When extra warnings are enabled, the cc_mask definition in asm/coco.h
causes a build failure with gcc:

arch/x86/include/asm/coco.h:28:18: error: 'cc_mask' defined but not used [-Werror=unused-const-variable=]
   28 | static const u64 cc_mask = 0;

Mark this one as __maybe_unused.

Fixes: a0a8d15a798b ("x86/tdx: Preserve shared bit on mprotect()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/include/asm/coco.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h
index aa6c8f8ca958..9e9204cfca6f 100644
--- a/arch/x86/include/asm/coco.h
+++ b/arch/x86/include/asm/coco.h
@@ -25,7 +25,7 @@ u64 cc_mkdec(u64 val);
 void cc_random_init(void);
 #else
 #define cc_vendor (CC_VENDOR_NONE)
-static const u64 cc_mask = 0;
+static const __maybe_unused u64 cc_mask = 0;
 
 static inline u64 cc_mkenc(u64 val)
 {
-- 
2.39.5