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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2006-06-04 02:51:34 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-05 12:29:16 -0700
commitc7d2d28b9851d0ffc9924b0e36bac806d18ebf25 (patch)
treef48fadad9a5cce62f7016cb48bc258928cb49114 /arch/alpha/kernel
parentba0c19ed6a61a96d4b42b81cb19d4bc81b5f728c (diff)
[PATCH] alpha: SMP IRQ routing fix
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru> After removal of fixup_cpu_present_map() function Alpha ended up with an empty cpu_present_map, so secondary CPUs on SMP systems are not being started. Worse, on some platforms we route interrupts to secondary CPUs using cpu_possible_map which is still populated properly. As a result, these interrupts go nowhere so the machines like DP264 aren't able to boot even with a primary CPU. Fixed basically by s/cpu_present_mask/cpu_present_map/. Thanks to Ernst Herzberg for reporting the bug and testing the fix. Cc: Ernst Herzberg <list-lkml@net4u.de> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/alpha/kernel')
-rw-r--r--arch/alpha/kernel/alpha_ksyms.c1
-rw-r--r--arch/alpha/kernel/process.c6
-rw-r--r--arch/alpha/kernel/smp.c14
-rw-r--r--arch/alpha/kernel/sys_titan.c2
4 files changed, 8 insertions, 15 deletions
diff --git a/arch/alpha/kernel/alpha_ksyms.c b/arch/alpha/kernel/alpha_ksyms.c
index c645c5e1478..2b245ad731e 100644
--- a/arch/alpha/kernel/alpha_ksyms.c
+++ b/arch/alpha/kernel/alpha_ksyms.c
@@ -182,7 +182,6 @@ EXPORT_SYMBOL(smp_num_cpus);
EXPORT_SYMBOL(smp_call_function);
EXPORT_SYMBOL(smp_call_function_on_cpu);
EXPORT_SYMBOL(_atomic_dec_and_lock);
-EXPORT_SYMBOL(cpu_present_mask);
#endif /* CONFIG_SMP */
/*
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 9924fd07743..c760a831fd1 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -94,7 +94,7 @@ common_shutdown_1(void *generic_ptr)
if (cpuid != boot_cpuid) {
flags |= 0x00040000UL; /* "remain halted" */
*pflags = flags;
- clear_bit(cpuid, &cpu_present_mask);
+ cpu_clear(cpuid, cpu_present_map);
halt();
}
#endif
@@ -120,8 +120,8 @@ common_shutdown_1(void *generic_ptr)
#ifdef CONFIG_SMP
/* Wait for the secondaries to halt. */
- cpu_clear(boot_cpuid, cpu_possible_map);
- while (cpus_weight(cpu_possible_map))
+ cpu_clear(boot_cpuid, cpu_present_map);
+ while (cpus_weight(cpu_present_map))
barrier();
#endif
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 185255416e8..4dc273e537f 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -68,7 +68,6 @@ enum ipi_message_type {
static int smp_secondary_alive __initdata = 0;
/* Which cpus ids came online. */
-cpumask_t cpu_present_mask;
cpumask_t cpu_online_map;
EXPORT_SYMBOL(cpu_online_map);
@@ -439,7 +438,7 @@ setup_smp(void)
if ((cpu->flags & 0x1cc) == 0x1cc) {
smp_num_probed++;
/* Assume here that "whami" == index */
- cpu_set(i, cpu_present_mask);
+ cpu_set(i, cpu_present_map);
cpu->pal_revision = boot_cpu_palrev;
}
@@ -450,11 +449,10 @@ setup_smp(void)
}
} else {
smp_num_probed = 1;
- cpu_set(boot_cpuid, cpu_present_mask);
}
- printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
- smp_num_probed, cpu_possible_map.bits[0]);
+ printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_map = %lx\n",
+ smp_num_probed, cpu_present_map.bits[0]);
}
/*
@@ -473,7 +471,7 @@ smp_prepare_cpus(unsigned int max_cpus)
/* Nothing to do on a UP box, or when told not to. */
if (smp_num_probed == 1 || max_cpus == 0) {
- cpu_present_mask = cpumask_of_cpu(boot_cpuid);
+ cpu_present_map = cpumask_of_cpu(boot_cpuid);
printk(KERN_INFO "SMP mode deactivated.\n");
return;
}
@@ -486,10 +484,6 @@ smp_prepare_cpus(unsigned int max_cpus)
void __devinit
smp_prepare_boot_cpu(void)
{
- /*
- * Mark the boot cpu (current cpu) as online
- */
- cpu_set(smp_processor_id(), cpu_online_map);
}
int __devinit
diff --git a/arch/alpha/kernel/sys_titan.c b/arch/alpha/kernel/sys_titan.c
index 5f84417eeb7..2551fb49ae0 100644
--- a/arch/alpha/kernel/sys_titan.c
+++ b/arch/alpha/kernel/sys_titan.c
@@ -66,7 +66,7 @@ titan_update_irq_hw(unsigned long mask)
register int bcpu = boot_cpuid;
#ifdef CONFIG_SMP
- cpumask_t cpm = cpu_present_mask;
+ cpumask_t cpm = cpu_present_map;
volatile unsigned long *dim0, *dim1, *dim2, *dim3;
unsigned long mask0, mask1, mask2, mask3, dummy;