Re: [RFC PATCH v2 23/27] mm/mmap: Add IBT bitmap size to address space limit check

[Yu-cheng Yu]

On Tue, 2018-07-10 at 16:57 -0700, Dave Hansen wrote:
> On 07/10/2018 03:26 PM, Yu-cheng Yu wrote:
> > 
> > The indirect branch tracking legacy bitmap takes a large address
> > space.ÂÂThis causes may_expand_vm() failure on the address limit
> > check.ÂÂFor a IBT-enabled task, add the bitmap size to the
> > address limit.
> This appears to require that we set up
> current->thread.cet.ibt_bitmap_size _before_ calling may_expand_vm().
> What keeps the ibt_mmap() itself from hitting the address limit?

Yes, that is overlooked. ÂI will fix it.

Thanks,
Yu-cheng