Commit 3a75578e authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Catalin Marinas
Browse files

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: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 64f17818

arch/arm64/include/asm/cpufeature.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

arch/arm64/kernel/setup.c

+8 −8
Original line number Diff line number Diff line
@@ -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);

arch/arm64/kernel/smp.c

+1 −0
Original line number Diff line number Diff line
@@ -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();

}

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