From: Ingo Molnar
...
So why not trylock and time out here after a few seconds,
instead of indefinitely supressing some potentially vital
output due to some other CPU crashing/locking with the lock
held?
I've used that for status requests that usually lock a table
to get a consistent view.
If
Many architectures have their own oops locking code that allows
the lock to be taken recursively. Create a common version.
Avoid creating generic locking functions, so they can't be
abused in other parts of the kernel.
Signed-off-by: Anton Blanchard an...@samba.org
---
include/linux/die_lock.h
* Ingo Molnar mi...@kernel.org wrote:
* Anton Blanchard an...@samba.org wrote:
+static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
+static unsigned int die_nest_count;
+
+unsigned long __die_spin_lock_irqsave(void)
+{
+ unsigned long
* Anton Blanchard an...@samba.org wrote:
+static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
+static unsigned int die_nest_count;
+
+unsigned long __die_spin_lock_irqsave(void)
+{
+ unsigned long flags;
+ int cpu;
+
+ /* racy, but
