Messages in this thread | | | Subject | Re: [PATCH v3 03/14] mm, hugetlb: protect region tracking via newly introduced resv_map lock | From | Davidlohr Bueso <> | Date | Mon, 06 Jan 2014 18:39:46 -0800 |
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On Wed, 2013-12-18 at 15:53 +0900, Joonsoo Kim wrote: > 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, > grab a mmap_sem. This doesn't prevent other process to modify region > structure, so it can be modified by two processes concurrently. > > To solve this, I introduce a lock to resv_map and make region manipulation > function grab a lock before they do actual work. This makes region > tracking safe. > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Davidlohr Bueso <davidlohr@hp.com>
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