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[PARISC] Always spinlock tlb flush operations to ensure preempt safety 

Since taking a spinlock disables preempt, and we need to spinlock tlb flush
on SMP for N class, we might as well just spinlock on uniprocessor machines
too.

Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Matthew Wilcox 2005-11-17 16:44:14 -05:00 committed by Kyle McMartin
parent 9d7d57567c
commit 29a622dd2b
1 changed files with 4 additions and 12 deletions
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16
include/asm-parisc/tlbflush.h
View File

@ -12,21 +12,15 @@
* N class systems, only one PxTLB inter processor broadcast can be
* active at any one time on the Merced bus. This tlb purge
* synchronisation is fairly lightweight and harmless so we activate
* it on all SMP systems not just the N class. */
#ifdef CONFIG_SMP
* it on all SMP systems not just the N class. We also need to have
* preemption disabled on uniprocessor machines, and spin_lock does that
* nicely.
*/
extern spinlock_t pa_tlb_lock;
#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
#else
#define purge_tlb_start(x) do { } while(0)
#define purge_tlb_end(x) do { } while (0)
#endif
extern void flush_tlb_all(void);
/*
@ -88,7 +82,6 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
flush_tlb_all();
else {
preempt_disable();
mtsp(vma->vm_mm->context,1);
purge_tlb_start();
if (split_tlb) {
@ -102,7 +95,6 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
pdtlb(start);
start += PAGE_SIZE;
}
preempt_enable();
}
purge_tlb_end();
}