• Benjamin Herrenschmidt's avatar
    powerpc/mm: Rework & cleanup page table freeing code path · c7cc58a1
    Benjamin Herrenschmidt authored
    That patch used to just add a hook to page table flushing but
    pulling that string brought out a whole bunch of issues, so it
    now does that and more:
    
     - We now make the RCU batching of page freeing SMP only, as I
    believe it was intended initially. We make a few more things compile
    to nothing on !CONFIG_SMP
    
     - Some macros are turned into functions, though that forced me to
    out of line a few stuffs due to unsolvable include depenencies,
    however it's probably better that way anyway, it's not -that-
    critical code path.
    
     - 32-bit didn't call pte_free_finish() on tlb_flush() which means
    that it wouldn't push out the batch to RCU for delayed freeing when
    a bunch of page tables have been freed, they would just stay in there
    until the batch gets full.
    
    64-bit BookE will use that hook to maintain the virtually linear
    page tables or the indirect entries in the TLB when using the
    HW loader.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    c7cc58a1
tlb.h 1.24 KB