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arm64: smp: remove pointless secondary_data maintenance
All reads and writes of secondary_data occur with the MMU on, using coherent attributes, so there's no need to perform any cache maintenance for this. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Suzuki Poulose <suzuki.poulose@arm.com> Cc: Will Deacon <will@kernel.org> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20210520115031.18509-4-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -122,7 +122,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
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secondary_data.task = idle;
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secondary_data.stack = task_stack_page(idle) + THREAD_SIZE;
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update_cpu_boot_status(CPU_MMU_OFF);
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__flush_dcache_area(&secondary_data, sizeof(secondary_data));
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/* Now bring the CPU into our world */
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ret = boot_secondary(cpu, idle);
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@ -143,7 +142,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
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pr_crit("CPU%u: failed to come online\n", cpu);
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secondary_data.task = NULL;
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secondary_data.stack = NULL;
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__flush_dcache_area(&secondary_data, sizeof(secondary_data));
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status = READ_ONCE(secondary_data.status);
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if (status == CPU_MMU_OFF)
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status = READ_ONCE(__early_cpu_boot_status);
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