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Benjamin LaHaise authored
Prior to the introduction of page migration support in "fs/aio: Add support to aio ring pages migration" / 36bc08cc, mapping of the ring buffer pages was done via get_user_pages() while retaining mmap_sem held for write. This avoided possible races with userland racing an munmap() or mremap(). The page migration patch, however, switched to using mm_populate() to prime the page mapping. mm_populate() cannot be called with mmap_sem held. Instead of dropping the mmap_sem, revert to the old behaviour and simply drop the use of mm_populate() since get_user_pages() will cause the pages to get mapped anyways. Thanks to Al Viro for spotting this issue. Signed-off-by:
Benjamin LaHaise <bcrl@kvack.org>
d6c355c7