• Kumar Gala's avatar
    powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted · e5e774d8
    Kumar Gala authored
    An example calling sequence which we did see:
    
    copy_user_highpage -> kmap_atomic -> flush_tlb_page -> _tlbil_va
    
    We got interrupted after setting up the MAS registers before the
    tlbwe and the interrupt handler that caused the interrupt also did
    a kmap_atomic (ide code) and thus on returning from the interrupt
    the MAS registers no longer contained the proper values.
    
    Since we dont save/restore MAS registers for normal interrupts we
    need to disable interrupts in _tlbil_va to ensure atomicity.
    Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
    e5e774d8
misc_32.S 20.6 KB