Re: [PATCH 0/8] __vmalloc() and no-block support

[Uladzislau Rezki]

On Thu, Aug 07, 2025 at 01:01:00PM +0200, Marco Elver wrote:
> On Thu, Aug 07, 2025 at 09:58AM +0200, Uladzislau Rezki (Sony) wrote:
> > Hello.
> > 
> > This is a second series of making __vmalloc() to support GFP_ATOMIC and
> > GFP_NOWAIT flags. It tends to improve the non-blocking behaviour.
> > 
> > The first one can be found here:
> > 
> > https://lore.kernel.org/all/20250704152537.55724-1-urezki@xxxxxxxxx/
> > 
> > that was an RFC. Using this series for testing i have not found more
> > places which can trigger: scheduling during atomic. Though there is
> > one which requires attention. I will explain in [1].
> > 
> > Please note, non-blocking gets improved in the __vmalloc() call only,
> > i.e. vmalloc_huge() still contains in its paths many cond_resched()
> > points and can not be used as non-blocking as of now.
> > 
> > [1] The vmap_pages_range_noflush() contains the kmsan_vmap_pages_range_noflush()
> > external implementation for KCSAN specifically which is hard coded to GFP_KERNEL.
> > The kernel should be built with CONFIG_KCSAN option. To me it looks like not
> > straight forward to run such kernel on my box, therefore i need more time to
> > investigate what is wrong with CONFIG_KCSAN and my env.
> 
> KMSAN or KCSAN?
> 
> [+Cc KMSAN maintainers]
>
Sorry for type, yes, that was about CONFIG_KMSAN.

--
Uladzislau Rezki