Alexander Nyberg wrote:
spin_lock_irqsave is only needed when a lock is taken both in normal
context and in interrupt context. Clearly this lock is not intended to
be taken in interrupt context.
According to Rusty's unreliable guide
(http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/c214.html)
if some code can be called from user context as well as in a softirq, at
least spin_lock_bh() is necessary. I am not sure whether that may be
true for the code that modifies files_lock.
I'll take a look, that spinlock debugging information unfortunately
doesn't give too much info :|
Thanks!
Martin
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