Re: [PATCH v2 1/3] x86/entry/64: Refactor IRQ stacks and make them NMI-safe

[Andy Lutomirski]

On Sat, Jul 25, 2015 at 11:05 PM, Borislav Petkov <bp@xxxxxxxxx> wrote:
> On Fri, Jul 24, 2015 at 10:57:04PM -0700, Andy Lutomirski wrote:
>> This will allow IRQ stacks to nest inside NMIs or similar entries
>> that can happen during IRQ stack setup or teardown.
>>
>> The Xen code here has a confusing comment.
>>
>> The new macros won't work correctly if they're invoked with IRQs on.
>> Add a check under CONFIG_DEBUG_ENTRY to detect that.
>>
>> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
>> ---
>>  arch/x86/Kconfig.debug       |  2 -
>>  arch/x86/entry/entry_64.S    | 89 +++++++++++++++++++++++++++++---------------
>>  arch/x86/kernel/process_64.c |  4 ++
>>  3 files changed, 63 insertions(+), 32 deletions(-)
>
> What does that apply against?
>
> I get conflicts against current Linus master:

It applies to the result of merging Linus' master with tip/x86/asm.  I
think it also applies to tip/x86/asm directly, but I haven't tried it.
It's an NMI-related thing (sort of), so it seemed sensible to develop
against something that has the other NMI fixes.

--Andy
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