Re: zram: zsmalloc calls sleeping function from atomic context

[Peter Zijlstra]

On Mon, Mar 17, 2014 at 04:01:17PM -0700, Andrew Morton wrote:
> btw, I note that vunmap() itself already has a might_sleep() in it, and
> I can't work out why - I don't think it _does_ sleep.  The changelog to
> 34754b69a6f87aa6aa is, in toto:
> 
> "x86: make vmap yell louder when it is used under irqs_disabled()"
> 
> No explanation *why*.  And why didn't it use WARN_ON(irqs_disabled())?

Man I suck.. and 5 years ago too. I can barely remember last week.

Lets see if the email archive has clues.

vmap()
  get_vm_area_caller()
    __get_vm_area_node(.gfp = GFP_KERNEL)
      kmalloc_node(gfp);


It does sleep.

https://lkml.org/lkml/2009/2/13/115
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