• J
    xen: use spin_lock_nest_lock when pinning a pagetable · eefb47f6
    Jeremy Fitzhardinge 提交于
    When pinning/unpinning a pagetable with split pte locks, we can end up
    holding multiple pte locks at once (we need to hold the locks while
    there's a pending batched hypercall affecting the pte page).  Because
    all the pte locks are in the same lock class, lockdep thinks that
    we're potentially taking a lock recursively.
    
    This warning is spurious because we always take the pte locks while
    holding mm->page_table_lock.  lockdep now has spin_lock_nest_lock to
    express this kind of dominant lock use, so use it here so that lockdep
    knows what's going on.
    Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    eefb47f6
mmu.c 29.1 KB