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由 Davidlohr Bueso 提交于
There is a race condition if we map a same file on different processes. Region tracking is protected by mmap_sem and hugetlb_instantiation_mutex. When we do mmap, we don't grab a hugetlb_instantiation_mutex, but only mmap_sem (exclusively). This doesn't prevent other tasks from modifying the region structure, so it can be modified by two processes concurrently. To solve this, introduce a spinlock to resv_map and make region manipulation function grab it before they do actual work. [davidlohr@hp.com: updated changelog] Signed-off-by: NDavidlohr Bueso <davidlohr@hp.com> Signed-off-by: NJoonsoo Kim <iamjoonsoo.kim@lge.com> Suggested-by: NJoonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: NDavid Gibson <david@gibson.dropbear.id.au> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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