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[SPARC64]: Fix new context version SMP handling.

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Don't piggy back the SMP receive signal code to do the
context version change handling.

Instead allocate another fixed PIL number for this
asynchronous cross-call.  We can't use smp_call_function()
because this thing is invoked with interrupts disabled
and a few spinlocks held.

Also, fix smp_call_function_mask() to count "cpus" correctly.
There is no guarentee that the local cpu is in the mask
yet that is exactly what this code was assuming.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-03-06 22:50:44 -08:00
parent a77754b4d0
commit ee29074d3b
10 changed files with 63 additions and 46 deletions
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39
arch/sparc64/kernel/smp.c
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@@ -760,12 +760,9 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
int nonatomic, int wait, cpumask_t mask)
{
struct call_data_struct data;
int cpus = cpus_weight(mask) - 1;
int cpus;
long timeout;
if (!cpus)
return 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
@@ -776,6 +773,11 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
spin_lock(&call_lock);
cpu_clear(smp_processor_id(), mask);
cpus = cpus_weight(mask);
if (!cpus)
goto out_unlock;
call_data = &data;
smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);
@@ -792,6 +794,7 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
udelay(1);
}
out_unlock:
spin_unlock(&call_lock);
return 0;
@@ -845,6 +848,7 @@ extern unsigned long xcall_flush_tlb_pending;
extern unsigned long xcall_flush_tlb_kernel_range;
extern unsigned long xcall_report_regs;
extern unsigned long xcall_receive_signal;
extern unsigned long xcall_new_mmu_context_version;
#ifdef DCACHE_ALIASING_POSSIBLE
extern unsigned long xcall_flush_dcache_page_cheetah;
@@ -973,8 +977,14 @@ void smp_receive_signal(int cpu)
}
void smp_receive_signal_client(int irq, struct pt_regs *regs)
{
clear_softint(1 << irq);
}
void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
{
struct mm_struct *mm;
unsigned long flags;
clear_softint(1 << irq);
@@ -982,25 +992,24 @@ void smp_receive_signal_client(int irq, struct pt_regs *regs)
* the version of the one we are using is now out of date.
*/
mm = current->active_mm;
if (likely(mm)) {
unsigned long flags;
if (unlikely(!mm || (mm == &init_mm)))
return;
spin_lock_irqsave(&mm->context.lock, flags);
spin_lock_irqsave(&mm->context.lock, flags);
if (unlikely(!CTX_VALID(mm->context)))
get_new_mmu_context(mm);
if (unlikely(!CTX_VALID(mm->context)))
get_new_mmu_context(mm);
load_secondary_context(mm);
__flush_tlb_mm(CTX_HWBITS(mm->context),
SECONDARY_CONTEXT);
spin_unlock_irqrestore(&mm->context.lock, flags);
spin_unlock_irqrestore(&mm->context.lock, flags);
}
load_secondary_context(mm);
__flush_tlb_mm(CTX_HWBITS(mm->context),
SECONDARY_CONTEXT);
}
void smp_new_mmu_context_version(void)
{
__smp_receive_signal_mask(cpu_online_map);
smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0);
}
void smp_report_regs(void)