linux-kernel - Re: [ghes_copy_tofrom_phys] BUG: sleeping function called from invalid context at mm/page

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Date:   Mon, 30 Oct 2017 18:42:35 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Huang Ying <ying.huang@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: [ghes_copy_tofrom_phys] BUG: sleeping function called from
 invalid context at mm/page_alloc.c:4150

On Mon, Oct 30, 2017 at 10:20:40AM -0700, Linus Torvalds wrote:
> I think this whole driver is garbage.

This "driver" was supposed to implement the handle-hw-errors-in-fw glue
crap. The thing is, no one has been using it properly because there's
not even a single firmware vendor who has managed to produce a working
fw glue reporting errors properly. At least I haven't seen one.

Which means, no one is really using this. And now ARM start using it for
real and shit hits fan.

And I'd love to fix it but finding a box which *actually* has a usable
GHES glue is, as I mentioned above, almost impossible so testing fixes
would be hard. I need to figure out something...

Thanks.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--