Does shmem_getpage==>shmem_alloc_page==>alloc_page_vma holdmmap_sem?

[Paul Jackson]

Andi,

The comment in mm/mempolicy.c for alloc_page_vma() states:

  Should be called with the mm_sem of the vma hold.

However it seems that the call chain (#ifdef CONFIG_NUMA):

  shmem_getpage ==> shmem_alloc_page ==> alloc_page_vma

where shmem_getpage() is called from many of the mm/shmem.c file
operations, is called without holding mmap_sem.  There is no
mention of mmap_sem in the entire mm/shmem.c file.

This doesn't seem right.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@xxxxxxx> 1.925.600.0401
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