From 3a75578efae64b94d76eacbf8adf2a3ab13c6aa1 Mon Sep 17 00:00:00 2001 From: "Suzuki K. Poulose" Date: Mon, 19 Oct 2015 14:24:39 +0100 Subject: [PATCH] arm64: Delay ELF HWCAP initialisation until all CPUs are up Delay the ELF HWCAP initialisation until all the (enabled) CPUs are up, i.e, smp_cpus_done(). This is in preparation for detecting the common features across the CPUS and creating a consistent ELF HWCAP for the system. Signed-off-by: Suzuki K. Poulose Tested-by: Dave Martin Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/setup.c | 16 ++++++++-------- arch/arm64/kernel/smp.c | 1 + 3 files changed, 10 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 171570702bb8..b7769f698a75 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -81,6 +81,7 @@ static inline int __attribute_const__ cpuid_feature_extract_field(u64 features, return (s64)(features << (64 - 4 - field)) >> (64 - 4); } +void __init setup_cpu_features(void); void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, const char *info); diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 1d503e2d6957..4f0408e1df0d 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -196,20 +196,13 @@ static void __init smp_build_mpidr_hash(void) __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash)); } -static void __init setup_processor(void) +void __init setup_cpu_features(void) { u64 features; s64 block; u32 cwg; int cls; - pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id()); - - sprintf(init_utsname()->machine, ELF_PLATFORM); - elf_hwcap = 0; - - cpuinfo_store_boot_cpu(); - /* * Check for sane CTR_EL0.CWG value. */ @@ -293,6 +286,13 @@ static void __init setup_processor(void) #endif } +static void __init setup_processor(void) +{ + pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id()); + sprintf(init_utsname()->machine, ELF_PLATFORM); + cpuinfo_store_boot_cpu(); +} + static void __init setup_machine_fdt(phys_addr_t dt_phys) { void *dt_virt = fixmap_remap_fdt(dt_phys); diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index c1d044b52f42..77763d9cb510 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -320,6 +320,7 @@ static void __init hyp_mode_check(void) void __init smp_cpus_done(unsigned int max_cpus) { pr_info("SMP: Total of %d processors activated.\n", num_online_cpus()); + setup_cpu_features(); hyp_mode_check(); apply_alternatives_all(); }