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 XmsPGfMr 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which is implemented for both the anon_vma_name implementation and ordinary madvise() operations use the same madvise_vma_behavior() implementation. * Thread state through the madvise_behavior state object - this object, very usefully introduced by SJ, is already used to transmit state through operations. This series extends this by having all madvise() operations use this, including anon_vma_name. * Thread range, VMA state through madvise_behavior - This helps avoid a lot of the confusing code around range and VMA state and again keeps things consistent and with a single 'source of truth'. * Addressing the very strange behaviour around the passed around struct vm_area_struct **prev pointer - all read-only users do absolutely nothing with the prev pointer. The only function that uses it is madvise_update_vma(), and in all cases prev is always reset to VMA. Fix this by no longer having aything but madvise_update_vma() reference prev, and having madvise_walk_vmas() update prev in each instance. Additionally make it clear that the meaningful change in vma state is when madvise_update_vma() potentially merges a VMA, so explicitly retrieve the VMA in this case. * Update and clarify the madvise_walk_vmas() function - this is a source of a great deal of confusion, so simplify, stop using prev = NULL to signify that the mmap lock has been dropped (!) and make that explicit, and add some comments to explain what's going on. Lorenzo Stoakes (5): mm/madvise: remove the visitor pattern and thread anon_vma state mm/madvise: thread mm_struct through madvise_behavior mm/madvise: thread VMA range state through madvise_behavior mm/madvise: thread all madvise state through madv_behavior mm/madvise: eliminate very confusing manipulation of prev VMA include/linux/huge_mm.h | 9 +- mm/khugepaged.c | 9 +- mm/madvise.c | 569 +++++++++++++++++++++------------------- 3 files changed, 309 insertions(+), 278 deletions(-) -- 2.49.0