The introduction of AT_HWCAP2 introduced accessors which ensure that hwcap features are set and tested appropriately. Let's now mandate access to elf_hwcap via these accessors by making elf_hwcap static within cpufeature.c. Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx> --- arch/arm64/include/asm/cpufeature.h | 15 ++++---------- arch/arm64/include/asm/hwcap.h | 7 +++---- arch/arm64/kernel/cpufeature.c | 32 +++++++++++++++++++++++++++-- 3 files changed, 37 insertions(+), 17 deletions(-) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index f06e1da1d678..4c766f831de6 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -392,19 +392,12 @@ extern DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE); for_each_set_bit(cap, cpu_hwcaps, ARM64_NCAPS) bool this_cpu_has_cap(unsigned int cap); +void cpu_set_feature(unsigned int num); +bool cpu_have_feature(unsigned int num); +unsigned long cpu_get_elf_hwcap(void); +unsigned long cpu_get_elf_hwcap2(void); -static inline void cpu_set_feature(unsigned int num) -{ - WARN_ON(num >= MAX_CPU_FEATURES); - elf_hwcap |= BIT(num); -} #define cpu_set_named_feature(name) cpu_set_feature(cpu_feature(name)) - -static inline bool cpu_have_feature(unsigned int num) -{ - WARN_ON(num >= MAX_CPU_FEATURES); - return elf_hwcap & BIT(num); -} #define cpu_have_named_feature(name) cpu_have_feature(cpu_feature(name)) /* System capability check for constant caps */ diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index d21fe3314d90..de9a66672ba7 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -17,6 +17,7 @@ #define __ASM_HWCAP_H #include <uapi/asm/hwcap.h> +#include <asm/cpufeature.h> #define COMPAT_HWCAP_HALF (1 << 1) #define COMPAT_HWCAP_THUMB (1 << 2) @@ -84,14 +85,13 @@ #define KERNEL_HWCAP_DCPODP (ilog2(HWCAP2_DCPODP) + 32) #ifndef __ASSEMBLY__ -#include <linux/kernel.h> /* * This yields a mask that user programs can use to figure out what * instruction set this cpu supports. */ -#define ELF_HWCAP lower_32_bits(elf_hwcap) -#define ELF_HWCAP2 upper_32_bits(elf_hwcap) +#define ELF_HWCAP cpu_get_elf_hwcap() +#define ELF_HWCAP2 cpu_get_elf_hwcap2() #ifdef CONFIG_COMPAT #define COMPAT_ELF_HWCAP (compat_elf_hwcap) @@ -107,6 +107,5 @@ enum { #endif }; -extern unsigned long elf_hwcap; #endif #endif diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 986ceeacd19f..84ca52fa75e5 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -35,8 +35,7 @@ #include <asm/traps.h> #include <asm/virt.h> -unsigned long elf_hwcap __read_mostly; -EXPORT_SYMBOL_GPL(elf_hwcap); +static unsigned long elf_hwcap __read_mostly; #ifdef CONFIG_COMPAT #define COMPAT_ELF_HWCAP_DEFAULT \ @@ -1947,6 +1946,35 @@ bool this_cpu_has_cap(unsigned int n) return false; } +void cpu_set_feature(unsigned int num) +{ + WARN_ON(num >= MAX_CPU_FEATURES); + elf_hwcap |= BIT(num); +} +EXPORT_SYMBOL_GPL(cpu_set_feature); + +bool cpu_have_feature(unsigned int num) +{ + WARN_ON(num >= MAX_CPU_FEATURES); + return elf_hwcap & BIT(num); +} +EXPORT_SYMBOL_GPL(cpu_have_feature); + +unsigned long cpu_get_elf_hwcap(void) +{ + /* + * We currently only populate the first 32 bits of AT_HWCAP. Please + * note that for userspace compatibility we guarantee that bit 62 + * will always be returned as 0. + */ + return lower_32_bits(elf_hwcap); +} + +unsigned long cpu_get_elf_hwcap2(void) +{ + return upper_32_bits(elf_hwcap); +} + static void __init setup_system_capabilities(void) { /* -- 2.21.0