Re: [patch] 2.4 fix to allow vmalloc at interrupt time

[William Lee Irwin III]

On Tue, May 13, 2003 at 02:11:12PM -0700, Matthew Jacob wrote:
> This fixes a buglet wrt doing vmalloc at interrupt time for 2.4.
> get_vm_area should call kmalloc with GFP_ATOMIC- after all, it's
> set up to allow for an allocation failure. As best as I read
> the 2.4 code, the rest of the path through _kmem_cache_alloc
> should be safe.

Try write_lock_irq(&vmlist_lock)/read_lock_irq(&vmlist_lock) and
passing in a gfp mask with an alternative API etc. for the interrupt
time special case. It's deadlockable without at least the locking bits.

But it's worse than that, the implicit smp_call_function() means this
is stillborn and infeasible period.

-- wli