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Commit 285f6722 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] smp: Merge smp_count_cpus() and smp_get_save_areas(). 



Merge smp_count_cpus() and smp_get_save_areas() so we save a loop over
all potentially present cpus.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent d9f774d4

arch/s390/kernel/smp.c

+21 −42
Original line number Diff line number Diff line
@@ -410,58 +410,40 @@ EXPORT_SYMBOL(smp_ctl_clear_bit); 
unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \

	__attribute__((__section__(".data")));



static void __init smp_get_save_areas(void)

static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)

{

	unsigned int cpu, cpu_num, rc;

	__u16 boot_cpu_addr;



	if (ipl_info.type != IPL_TYPE_FCP_DUMP)

		return;

	boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;

	cpu_num = 1;

	for (cpu = 0; cpu <= 65535; cpu++) {

		if ((u16) cpu == boot_cpu_addr)

			continue;

		__cpu_logical_map[1] = (__u16) cpu;

		if (signal_processor(1, sigp_sense) == sigp_not_operational)

			continue;

		if (cpu_num >= NR_CPUS) {

			printk("WARNING: Registers for cpu %i are not "

			       "saved, since dump kernel was compiled with"

			       "NR_CPUS=%i!\n", cpu_num, NR_CPUS);

			continue;

	if (cpu >= NR_CPUS) {

		printk(KERN_WARNING "Registers for cpu %i not saved since dump "

		       "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS);

		return;

	}

		zfcpdump_save_areas[cpu_num] =

			alloc_bootmem(sizeof(union save_area));

		while (1) {

			rc = signal_processor(1, sigp_stop_and_store_status);

			if (rc != sigp_busy)

				break;

	zfcpdump_save_areas[cpu] = alloc_bootmem(sizeof(union save_area));

	__cpu_logical_map[1] = (__u16) phy_cpu;

	while (signal_processor(1, sigp_stop_and_store_status) == sigp_busy)

		cpu_relax();

		}

		memcpy(zfcpdump_save_areas[cpu_num],

		       (void *)(unsigned long) store_prefix() +

		       SAVE_AREA_BASE, SAVE_AREA_SIZE);

#ifdef __s390x__

	memcpy(zfcpdump_save_areas[cpu],

	       (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,

	       SAVE_AREA_SIZE);

#ifdef CONFIG_64BIT

	/* copy original prefix register */

		zfcpdump_save_areas[cpu_num]->s390x.pref_reg =

			zfcpdump_prefix_array[cpu_num];

	zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu];

#endif

		cpu_num++;

	}

}



union save_area *zfcpdump_save_areas[NR_CPUS + 1];

EXPORT_SYMBOL_GPL(zfcpdump_save_areas);



#else

#define smp_get_save_areas() do { } while (0)

#endif



static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }



#endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */



/*

 * Lets check how many CPUs we have.

 */



static unsigned int __init smp_count_cpus(void)

{

	unsigned int cpu, num_cpus;
@@ -470,7 +452,6 @@ static unsigned int __init smp_count_cpus(void) 
	/*

	 * cpu 0 is the boot cpu. See smp_prepare_boot_cpu.

	 */



	boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;

	current_thread_info()->cpu = 0;

	num_cpus = 1;
@@ -480,12 +461,11 @@ static unsigned int __init smp_count_cpus(void) 
		__cpu_logical_map[1] = (__u16) cpu;

		if (signal_processor(1, sigp_sense) == sigp_not_operational)

			continue;

		smp_get_save_area(num_cpus, cpu);

		num_cpus++;

	}



	printk("Detected %d CPU's\n", (int) num_cpus);

	printk("Boot cpu address %2X\n", boot_cpu_addr);



	return num_cpus;

}
@@ -606,7 +586,6 @@ void __init smp_setup_cpu_possible_map(void) 
{

	unsigned int phy_cpus, pos_cpus, cpu;



	smp_get_save_areas();

	phy_cpus = smp_count_cpus();

	pos_cpus = min(phy_cpus + additional_cpus, (unsigned int) NR_CPUS);