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Commit d2bcbad5 authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Ingo Molnar
Browse files

x86: do not zap_low_mappings in __smp_prepare_cpus 



It was okay when cpus were cold booted before this point.
But with the new state machine, they will not have arrived to
the trampoline yet. zapping low mappings will have the bad effect
of breaking it completely after paging enablement

Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 802b8133

arch/x86/kernel/smpboot_32.c

+0 −7
Original line number Diff line number Diff line
@@ -195,11 +195,6 @@ static void __cpuinit start_secondary(void *unused) 
		enable_NMI_through_LVT0();

		enable_8259A_irq(0);

	}

	/*

	 * low-memory mappings have been cleared, flush them from

	 * the local TLBs too.

	 */

	local_flush_tlb();



	/* This must be done before setting cpu_online_map */

	set_cpu_sibling_map(raw_smp_processor_id());
@@ -714,8 +709,6 @@ static void __cpuinit __smp_prepare_cpu(int cpu) 
		schedule_work(&info.task);

		wait_for_completion(&done);

	}



	zap_low_mappings();

}

#endif