On Fri, 4 Feb 2022 13:53:48 +1000, Nicholas Piggin wrote:
> Hash faults are not resoved in NMI context, instead causing the access
> to fail. This is done because perf interrupts can get backtraces
> including walking the user stack, and taking a hash fault on those could
> deadlock on the HPTE lock if the perf interrupt hits while the same HPTE
> lock is being held by the hash fault code. The user-access for the stack
> walking will notice the access failed and deal with that in the perf
> code.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/64s/hash: Make hash faults work in NMI context
https://git.kernel.org/powerpc/c/8b91cee5eadd2021f55e6775f2d50bd56d00c217
cheers
