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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2023 17:51:26.6317 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 90b7500e-368c-4be0-af7e-08db5d48a98e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT032.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8186 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1685037135601100001 Content-Type: text/plain; charset="utf-8" clang doesn't like extern with __attribute__((__used__)): ./arch/arm/include/asm/setup.h:171:8: error: 'used' attribute ignored [-W= error,-Wignored-attributes] extern DEFINE_BOOT_PAGE_TABLE(boot_pgtable); ^ ./arch/arm/include/asm/lpae.h:273:29: note: expanded from macro 'DEFINE_B= OOT_PAGE_TABLE' lpae_t __aligned(PAGE_SIZE) __section(".data.page_aligned") = \ ^ ./include/xen/compiler.h:71:27: note: expanded from macro '__section' #define __section(s) __used __attribute__((__section__(s))) ^ ./include/xen/compiler.h:104:39: note: expanded from macro '__used' #define __used __attribute__((__used__)) ^ Introduce a new EXTERN_DEFINE_BOOT_PAGE_TABLE macro without __attribute__((__used__)) and use this for the relevant declarations. Fixes: 1c78d76b67e1 ("xen/arm64: mm: Introduce helpers to prepare/enable/di= sable the identity mapping") Signed-off-by: Stewart Hildebrand --- I tested with clang 12 and clang 16 Here is my make command line: make -j $(nproc) \ clang=3Dy \ CC=3D"clang --target=3Daarch64-none-linux-gnu -march=3Darmv8a+nocrypto"= \ CXX=3D"clang++ --target=3Daarch64-none-linux-gnu -march=3Darmv8a+nocryp= to" \ HOSTCC=3Dclang \ HOSTCXX=3Dclang++ \ XEN_TARGET_ARCH=3Darm64 \ CROSS_COMPILE=3Daarch64-none-linux-gnu- \ dist-xen --- xen/arch/arm/include/asm/lpae.h | 4 ++++ xen/arch/arm/include/asm/setup.h | 8 ++++---- xen/include/xen/compiler.h | 1 + 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/xen/arch/arm/include/asm/lpae.h b/xen/arch/arm/include/asm/lpa= e.h index 3fdd5d0de28e..294a8aa4bd30 100644 --- a/xen/arch/arm/include/asm/lpae.h +++ b/xen/arch/arm/include/asm/lpae.h @@ -273,6 +273,10 @@ lpae_t mfn_to_xen_entry(mfn_t mfn, unsigned int attr); lpae_t __aligned(PAGE_SIZE) __section(".data.page_aligned") = \ name[XEN_PT_LPAE_ENTRIES] =20 +#define EXTERN_DEFINE_BOOT_PAGE_TABLE(name) = \ +extern lpae_t __aligned(PAGE_SIZE) __no_used_section(".data.page_aligned")= \ + name[XEN_PT_LPAE_ENTRIES] + #define DEFINE_PAGE_TABLES(name, nr) \ lpae_t __aligned(PAGE_SIZE) name[XEN_PT_LPAE_ENTRIES * (nr)] =20 diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/se= tup.h index 38e2ce255fcf..af53e58a6a07 100644 --- a/xen/arch/arm/include/asm/setup.h +++ b/xen/arch/arm/include/asm/setup.h @@ -168,13 +168,13 @@ u32 device_tree_get_u32(const void *fdt, int node, int map_range_to_domain(const struct dt_device_node *dev, u64 addr, u64 len, void *data); =20 -extern DEFINE_BOOT_PAGE_TABLE(boot_pgtable); +EXTERN_DEFINE_BOOT_PAGE_TABLE(boot_pgtable); =20 #ifdef CONFIG_ARM_64 -extern DEFINE_BOOT_PAGE_TABLE(boot_first_id); +EXTERN_DEFINE_BOOT_PAGE_TABLE(boot_first_id); #endif -extern DEFINE_BOOT_PAGE_TABLE(boot_second_id); -extern DEFINE_BOOT_PAGE_TABLE(boot_third_id); +EXTERN_DEFINE_BOOT_PAGE_TABLE(boot_second_id); +EXTERN_DEFINE_BOOT_PAGE_TABLE(boot_third_id); =20 /* Find where Xen will be residing at runtime and return a PT entry */ lpae_t pte_of_xenaddr(vaddr_t); diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h index 7d7ae2e5e4d9..70ba563e29c2 100644 --- a/xen/include/xen/compiler.h +++ b/xen/include/xen/compiler.h @@ -73,6 +73,7 @@ #define __section(s) __attribute__((__section__(s))) #endif #define __used_section(s) __used __attribute__((__section__(s))) +#define __no_used_section(s) __attribute__((__section__(s))) #define __text_section(s) __attribute__((__section__(s))) =20 #define __aligned(a) __attribute__((__aligned__(a))) --=20 2.40.1