Re: [ghes_copy_tofrom_phys] BUG: sleeping function called from invalid context at mm/page_alloc.c:4150

[Tyler Baicar]

On 10/30/2017 10:06 AM, Borislav Petkov wrote:
> On Mon, Oct 30, 2017 at 10:01:52AM -0400, Tyler Baicar wrote:
> > This is not as important for polling sources as it is for the
> > interrupt sources since polling sources are regularly checked and
> > shouldn't be used for fatal error scenarios. For interrupt driven
> > sources, there could already be a fatal error pending, so we should
> > handle it immediately.
> Whatever it is, you can't call it there as it could deadlock. You need
> to think about doing that differently. If you can't come up with a
> solution quickly, it should be reverted and then you can try again
> later.
I'm okay with reverting this and coming up with another solution, but that seems 
like it
could be masking a problem. It should be valid for the polling timer to expire 
right after
this probe function completes which would then trigger ghes_poll_func() to be called
and that calls into ghes_proc() immediately.

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