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Commit d0d3cdf4 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] smp: perform initial cpu reset before starting a cpu 



Performing an initial cpu reset makes sure all registers and tlbs of
the targeted cpu are initialized and flushed.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6d54c5a3

arch/s390/kernel/smp.c

+16 −7
Original line number Diff line number Diff line
@@ -534,18 +534,23 @@ int __cpuinit __cpu_up(unsigned int cpu) 
	struct _lowcore *cpu_lowcore;

	struct stack_frame *sf;

	sigp_ccode ccode;

	u32 lowcore;



	if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)

		return -EIO;

	if (smp_alloc_lowcore(cpu))

		return -ENOMEM;

	do {

		ccode = signal_processor(cpu, sigp_initial_cpu_reset);

		if (ccode == sigp_busy)

			udelay(10);

		if (ccode == sigp_not_operational)

			goto err_out;

	} while (ccode == sigp_busy);



	ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),

				   cpu, sigp_set_prefix);

	if (ccode) {

		smp_free_lowcore(cpu);

		return -EIO;

	}

	lowcore = (u32)(unsigned long)lowcore_ptr[cpu];

	while (signal_processor_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)

		udelay(10);



	idle = current_set[cpu];

	cpu_lowcore = lowcore_ptr[cpu];
@@ -574,6 +579,10 @@ int __cpuinit __cpu_up(unsigned int cpu) 
	while (!cpu_online(cpu))

		cpu_relax();

	return 0;



err_out:

	smp_free_lowcore(cpu);

	return -EIO;

}



static int __init setup_possible_cpus(char *s)