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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses

* Jeremy Fitzhardinge <> wrote:

>> Further -fstack-protector-all only seems to detect against buffer
>> overflows and thus corruption of the stack. Not stack overflows. So
>> it doesn't appear especially useful.
> It's a bit useful. But at the cost of preventing a pile of more
> useful unification work, not to mention making all access to per-cpu
> variables more expensive.

well, stackprotector is near zero maintenance trouble. It mostly binds
in places that are fundamentally non-unifiable anyway. (nobody is going
to unify the assembly code in switch_to())

i had zero-based percpu problems (early crashes) with a 4.2.3 gcc that
had --fstack-protect compiled out, so there's no connection there.

In its fixed form in tip/core/stackprotector it can catch the splice
exploit which makes it quite a bit useful. It would be rather silly to
not offer that feature.


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