Re: %u-order allocation failed

[Mikulas Patocka]

> In article <[e-mail]> you wrote:
> 
> > NOTE: no allocations in IRQ are safe. Not only high-order ones. 
> > Allocation in IRQ may fail any time and you must recover without lost of
> > functionality (network can lose packets any time, if you are doing some
> > general device driver, you must preallocate all buffers in process
> > context).
> 
> how again do you deal with calling vfree() on the ones where you used
> vmalloc instead of the buddy allocator ?

It's in the patch: if someone calls get_free_pages on vmallocated memory,
it will be freed with vfree instead of __get_free_pages.

Of course you can't allocate memory in process context and free it in
interrupt context - which you could do without __GFP_VMALLOC.

Mikulas