Messages in this thread |  | | | Date | Fri, 27 Apr 2007 15:41:55 -0500 | | From | Matt Mackall <> | | Subject | Re: - maps2-add-proc-pid-pagemap-interface-fix.patch removed from -mm tree |
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On Fri, Apr 27, 2007 at 01:27:13PM -0700, Andrew Morton wrote: > On Fri, 27 Apr 2007 14:45:33 +0400 > Alexey Dobriyan <adobriyan@sw.ru> wrote: > > > > maps2-add-proc-pid-pagemap-interface.patch > > > > Ohhh, you're repeating december mincore() bug > > 2f77d107050abc14bc393b34bdb7b91cf670c250 > > > > pagemap_read() takes ->mmap_sem for reading > > walk_page_range > > pagemap_pte_range > > add_to_pagemap > > flush_pagemap > > copy_to_user > > argh. I think it's always a bug to run uaccess functions while holding > mmap_sem, isn't it?
Yep, looks that way.
> I'll see if I can get something like this working as a -mm-only thing:
I was wondering if there was a sensible way to do this. This looks pretty good.
> + no+_mmap_sem(); \
Except for this bit. Maybe put it in the same config bucket as might_sleep?
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