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[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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.1
Heiko Carstens 2007-07-10 11:24:13 +02:00 committed by Martin Schwidefsky
parent d9f774d439
commit 285f67227b
1 changed files with 21 additions and 42 deletions
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63
arch/s390/kernel/smp.c
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@ -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;
}
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;
cpu_relax();
}
memcpy(zfcpdump_save_areas[cpu_num],
(void *)(unsigned long) store_prefix() +
SAVE_AREA_BASE, SAVE_AREA_SIZE);
#ifdef __s390x__
/* copy original prefix register */
zfcpdump_save_areas[cpu_num]->s390x.pref_reg =
zfcpdump_prefix_array[cpu_num];
#endif
cpu_num++;
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] = 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],
(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
SAVE_AREA_SIZE);
#ifdef CONFIG_64BIT
/* copy original prefix register */
zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu];
#endif
}
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);