Re: [PATCH] kernel.h: Add non_block_start/end()

[Michal Hocko]

On Tue 21-05-19 14:43:38, Cristopher Lameter wrote:
> On Tue, 21 May 2019, Daniel Vetter wrote:
> 
> > In some special cases we must not block, but there's not a
> > spinlock, preempt-off, irqs-off or similar critical section already
> > that arms the might_sleep() debug checks. Add a non_block_start/end()
> > pair to annotate these.
> 
> Just putting preempt on/off around these is not sufficient?

It is not a critical section. It is a _debugging_ facility to help
discover blocking contexts.
-- 
Michal Hocko
SUSE Labs