powerpc/mm: Fix spurrious segfaults on radix with autonuma

When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it
clears all the protection bits but leave the PTE valid.

With the Radix MMU, an attempt at executing from such a PTE will
take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G".

It is thus incorrect to treat all such faults as errors. We should
pass them to handle_mm_fault() for autonuma to deal with. The case
of pages that are really not executable is handled by the existing
test for VM_EXEC further down.

That leaves us with catching the kernel attempts at executing user
pages. We can catch that earlier, even before we do find_vma.

It is never valid on powerpc for the kernel to take an exec fault
to begin with. So fold that test with the existing test for the
kernel faulting on kernel addresses to bail out early.

Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report")
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

path: root/net/nfc/hci/Kconfig

config NFC_HCI
       depends on NFC
       tristate "NFC HCI implementation"
       default n
       help
	 Say Y here if you want to build support for a kernel NFC HCI
	 implementation. This is mostly needed for devices that only process
	 HCI frames, like for example the NXP pn544.

config NFC_SHDLC
	depends on NFC_HCI
	select CRC_CCITT
	bool "SHDLC link layer for HCI based NFC drivers"
	default n
	---help---
	  Say yes if you use an NFC HCI driver that requires SHDLC link layer.
	  If unsure, say N here.