From: Christoph L. <cla...@sg...> - 2008-04-23 18:27:23
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On Wed, 23 Apr 2008, Andrea Arcangeli wrote: > On Wed, Apr 23, 2008 at 11:09:35AM -0700, Christoph Lameter wrote: > > Why is there still the hlist stuff being used for the mmu notifier list? > > And why is this still unsafe? > > What's the problem with hlist, it saves 8 bytes for each mm_struct, > you should be using it too instead of list. list heads in mm_struct and in the mmu_notifier struct seemed to be more consistent. We have no hash list after all. > > > There are cases in which you do not take the reverse map locks or mmap_sem > > while traversing the notifier list? > > There aren't. There is a potential issue in move_ptes where you call invalidate_range_end after dropping i_mmap_sem whereas my patches did the opposite. Mmap_sem saves you there? |