From ec73859d76db768da97ee799a91eb9c7d28974fe Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 10 Mar 2025 14:10:59 +0100 Subject: [PATCH] x86/coco: Replace 'static const cc_mask' with the newly introduced cc_get_mask() function When extra warnings are enabled, the cc_mask definition in 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; Add a cc_get_mask() function mirroring cc_set_mask() for the one user of the variable outside of the CoCo implementation. Fixes: a0a8d15a798b ("x86/tdx: Preserve shared bit on mprotect()") Signed-off-by: Arnd Bergmann Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250310131114.2635497-1-arnd@kernel.org -- v2: use an inline helper instead of a __maybe_unused annotaiton. --- arch/x86/include/asm/coco.h | 10 +++++++++- arch/x86/include/asm/pgtable_types.h | 2 +- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h index aa6c8f8ca9588..e7225452963f0 100644 --- a/arch/x86/include/asm/coco.h +++ b/arch/x86/include/asm/coco.h @@ -15,6 +15,11 @@ enum cc_vendor { extern enum cc_vendor cc_vendor; extern u64 cc_mask; +static inline u64 cc_get_mask(void) +{ + return cc_mask; +} + static inline void cc_set_mask(u64 mask) { RIP_REL_REF(cc_mask) = mask; @@ -25,7 +30,10 @@ u64 cc_mkdec(u64 val); void cc_random_init(void); #else #define cc_vendor (CC_VENDOR_NONE) -static const u64 cc_mask = 0; +static inline u64 cc_get_mask(void) +{ + return 0; +} static inline u64 cc_mkenc(u64 val) { diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 4b804531b03c3..9c4d9fafe0105 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -177,7 +177,7 @@ enum page_cache_mode { }; #endif -#define _PAGE_CC (_AT(pteval_t, cc_mask)) +#define _PAGE_CC (_AT(pteval_t, cc_get_mask())) #define _PAGE_ENC (_AT(pteval_t, sme_me_mask)) #define _PAGE_CACHE_MASK (_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)