| commit | 65ee8f0a7fc2f2267b983f1f0349acb8f19db6e6 | |
| author | Matthew Wilcox <matthew@wil.cx> | |
| Fri, 8 Sep 2006 11:43:44 +0000 (8 05:43 -0600) | ||
| committer | Matthew Wilcox <willy@parisc-linux.org> | |
| Wed, 4 Oct 2006 12:48:17 +0000 (4 06:48 -0600) | ||
| tree | a74a9c7683957545c67777aee644ef14801975a2 | treesnapshot (tar.gz zip) |
| parent | 56f335c89e28c488b1bfea3e5e697fce805c784d | commitdiff |
[PARISC] Enable interrupts while spinning
Use the __raw_spin_lock_flags routine so we can take an interrupt while
spinning. This re-fixes a bug jejb found on 2005-10-20:
CPU0 does a flush_tlb_all holding the vmlist_lock for write.
CPU1 tries a cat of /proc/meminfo which tries to acquire vmlist_lock for read
CPU1 is now spinning with interrupts disabled
CPU0 tries to execute a smp_call_function to flush the local tlb caches
This is now a deadlock because CPU1 is spinning with interrupts disabled and
can never receive the IPI
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Use the __raw_spin_lock_flags routine so we can take an interrupt while
spinning. This re-fixes a bug jejb found on 2005-10-20:
CPU0 does a flush_tlb_all holding the vmlist_lock for write.
CPU1 tries a cat of /proc/meminfo which tries to acquire vmlist_lock for read
CPU1 is now spinning with interrupts disabled
CPU0 tries to execute a smp_call_function to flush the local tlb caches
This is now a deadlock because CPU1 is spinning with interrupts disabled and
can never receive the IPI
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
| include/asm-parisc/spinlock.h | diffblobblamehistory |