Re: NetBSD xen dom0 kernel panic

[Thor Lancelot Simon <tls%rek.tjls.com@localhost>]

On Wed, Mar 18, 2009 at 09:24:26PM -0400, peter wrote:
> On Wed, 2009-03-18 at 18:59 -0400, Thor Lancelot Simon wrote:
> > On Wed, Mar 18, 2009 at 03:20:11PM -0400, Peter wrote:
> > > 
> > > In what way is using pool_foo safe in an interrupt context?
> > 
> > In the way the manual page says: if the pool is initialized with the
> > highest IPL in effect in any interrupt context in which it will be accessed,
> > and all accesses to the pool are protected against interrupts at that IPL
> > or lower.
> 
> And the malloc and free calls aren't an issue?

Uh, what malloc and free calls, the ones that pool(9) doesn't make?

There is one call to malloc in subr_pool.c, to allocate a tracing
structure if POOL_DIAGNOSTIC is defined -- and that's in pool_init(),
which only a madman would call from interrupt context.

The manual page says what you have to do to use pool(9) safely
from interrupt context.  Obey it and the code will work fine.

Thor