Messages in this thread | | | Subject | Re: dio_get_page() lockdep complaints | From | Martin Schwidefsky <> | Date | Mon, 12 Nov 2007 09:45:52 +0100 |
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On Sun, 2007-11-11 at 20:49 +0100, Peter Zijlstra wrote: > Right, which gets us into all kinds of trouble because some sites need > mmap_sem to resolve some races, notably s390 31-bit and shm.
You are refering to the mmap_sem use in compat_linux.c:do_mmap2, aren't you? That check for adresses > 2GB after the call to do_mmap_pgoff can be removed since arch_get_unmapped_area already checks against TASK_SIZE. The result of the do_mmap_pgoff call will never be out of range. This check is a left-over from the early days of the s390 compat code.
-- blue skies, Martin.
"Reality continues to ruin my life." - Calvin.
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