From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp@suse.de>
Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request
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Date: Thu, 9 Mar 2017 23:48:20 +0100
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kees Cook <keescook@chromium.org>,
        Laura Abbott <labbott@redhat.com>,
        Ingo Molnar <mingo@kernel.org>, Peter Anvin <hpa@zytor.com>,
        Fengguang Wu <fengguang.wu@intel.com>,
        Network Development <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>, LKP <lkp@01.org>,
        ast@fb.com, the arch/x86 maintainers <x86@kernel.org>,
        "David S. Miller" <davem@davemloft.net>
To: Daniel Borkmann <daniel@iogearbox.net>
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On Thu, Mar 09, 2017 at 11:11:17PM +0100, Daniel Borkmann wrote:
> Yeah, I just tried that out and it had no effect unfortunately, the
> static_cpu_has() was still 1.

Right, just as I thought.

I guess we could return to doing boot_cpu_has() in __flush_tlb_all()
then. I mean, the timing-sensitivity argument is meh - killing global
TLB entries a bit faster doesn't bring me a whole lot when I have to go
and walk pagetable and reestablish them, which is the real price to pay
anyway.

Thanks.

-- 
Regards/Gruss,
    Boris.

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