Re: [PATCH 0/5] mm improvements

Hugh Dickins [off-list ref] wrote:

quoted

4. I found that shmem_writepage() has BUG_ON(page_mapped(page))

 > check. Its removal had no effect, and I am not sure why the check was
 > there at all.

 Sorry, that BUG_ON is there for very good reason.  It's no disgrace
 that your testing didn't notice the effect of passing a mapped page
 down to shmem_writepage, but it is a serious breakage of tmpfs.

hm.  Can't I force writepage-of-a-mapped-page with msync()?
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