diff options
| author | Helge Deller <deller@gmx.de> | 2009-07-29 23:17:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-08-16 14:26:56 -0700 |
| commit | 2614443191474e4c8619bf59665f9ef820e5276c (patch) | |
| tree | 2420f887cc21cde58b8e18c897808990c226cf45 /include | |
| parent | 04101e4e4ef4ff5035ce5ad4510db02eb54c4985 (diff) | |
parisc: ensure broadcast tlb purge runs single threaded
commit e82a3b75127188f20c7780bec580e148beb29da7 upstream
parisc: ensure broadcast tlb purge runs single threaded
The TLB flushing functions on hppa, which causes PxTLB broadcasts on the system
bus, needs to be protected by irq-safe spinlocks to avoid irq handlers to deadlock
the kernel. The deadlocks only happened during I/O intensive loads and triggered
pretty seldom, which is why this bug went so long unnoticed.
Signed-off-by: Helge Deller <deller@gmx.de>
[edited to use spin_lock_irqsave on UP as well since we'd been locking there
all this time anyway, --kyle]
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-parisc/tlbflush.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/include/asm-parisc/tlbflush.h b/include/asm-parisc/tlbflush.h index 1f6fd4fc05b9..9c5d646eb3fe 100644 --- a/include/asm-parisc/tlbflush.h +++ b/include/asm-parisc/tlbflush.h @@ -12,14 +12,12 @@ * 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. We also need to have - * preemption disabled on uniprocessor machines, and spin_lock does that - * nicely. + * it on all systems not just the N class. */ 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) +#define purge_tlb_start(flags) spin_lock_irqsave(&pa_tlb_lock, flags) +#define purge_tlb_end(flags) spin_unlock_irqrestore(&pa_tlb_lock, flags) extern void flush_tlb_all(void); extern void flush_tlb_all_local(void *); @@ -63,14 +61,15 @@ static inline void flush_tlb_mm(struct mm_struct *mm) static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) { + unsigned long flags; /* For one page, it's not worth testing the split_tlb variable */ mb(); mtsp(vma->vm_mm->context,1); - purge_tlb_start(); + purge_tlb_start(flags); pdtlb(addr); pitlb(addr); - purge_tlb_end(); + purge_tlb_end(flags); } void __flush_tlb_range(unsigned long sid, |