Merge "UPSTREAM: arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks"

static void tls_thread_switch(struct task_struct *next)

{

	unsigned long tpidr, tpidrro;

	unsigned long tpidr;

	tpidr = read_sysreg(tpidr_el0);

	*task_user_tls(current) = tpidr;

	tpidr = *task_user_tls(next);

	tpidrro = is_compat_thread(task_thread_info(next)) ?

		  next->thread.tp_value : 0;

	if (is_compat_thread(task_thread_info(next)))

		write_sysreg(next->thread.tp_value, tpidrro_el0);

	else if (!arm64_kernel_unmapped_at_el0())

		write_sysreg(0, tpidrro_el0);

	write_sysreg(tpidr, tpidr_el0);

	write_sysreg(tpidrro, tpidrro_el0);

	write_sysreg(*task_user_tls(next), tpidr_el0);

}

/* Restore the UAO state depending on next's addr_limit */