Re: [PATCH] Don't sleep in oops_begin()

[Daniel Walker <dwalker@mvista.com>]

On Mon, 2007-09-17 at 21:00 +0200, Andi Kleen wrote:
> > Since it's all got "__" in the front, not good to use this method all
> > over .. If you just need a real spinlock best to use
> > DEFINE_RAW_SPINLOCK() unless your a special situation ..
> 
> Oopsing is a special situation. Nobody knows if all the fancy infrastructure
> lurking inside the other macros still works.

In the case of spinlocks, real time just differs from the mainline
kernel by make a spinlock_t into a mutex .. We know that's not going to
work in this situation. The rest of the debugging added to spinlocks is
mostly un-changed from mainline (like lockdep is still there)..

So you should be able to use a regular mainline style spinlock_t for the
die_lock, even with all the debugging ..

The real time spinlock macros are pretty complex , but it's mostly
compile related complexity that disappears when you run the kernel.

Daniel