Re: [PATCH v4 21/22] Add support for pmd_faults

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On Mon, Dec 23, 2013 at 11:42:22AM -0700, Matthew Wilcox wrote:
> > Do you know anyone who relay on SIGBUS for correctness?
> 
> Oh, I remember the real reason now.  If we install a PMD that hangs off
> the end of the file then by reading past i_size, we can read the blocks of
> whatever happens to be in storage after the end of the file, which could
> be another file's data.  This doesn't happen for the PTE case because the
> existing code only works for filesystems with a block size == PAGE_SIZE.

I see. It's valid reason. Probably, it's better to add comment there.

-- 
 Kirill A. Shutemov
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