powerpc/mm: Detect instruction fetch denied and report
ISA 3 allows for prevention of instruction fetch and execution of user mode pages. If such an error occurs, SRR1 bit 35 reports the error. We catch and report the error in do_page_fault(). Signed-off-by: NBalbir Singh <bsingharora@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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