tree 8a11d55123c20b5341a95941c77eb3d35e4ef9d8
parent 84be31be3727d11b2a91781306b642e801c5a379
author Helge Deller <deller@gmx.de> 1245185508 +0000
committer Kyle McMartin <kyle@mcmartin.ca> 1246592049 +0000

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>