Messages in this thread | | | Date | Tue, 25 May 2004 12:47:15 -0700 | From | Andrew Morton <> | Subject | Re: mlockall and mmap of IO devices don't mix |
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Joe Korty <joe.korty@ccur.com> wrote: > > On Fri, May 21, 2004 at 07:13:26PM -0700, Andrew Morton wrote: > > Mark Hounschell <markh@compro.net> wrote: > > > > > > Joe Korty wrote: > > > > > > > > 2.6.0-test6: the use of mlockall(2) in a process that has mmap(2)ed > > > > the registers of an IO device will hang that process uninterruptibly. > > > > The task runs in an infinite loop in get_user_pages(), invoking > > > > follow_page() forever. > > > > > > > > Using binary search I discovered that the problem was introduced > > > > in 2.5.14, specifically in ChangeSetKey > > > > > > > > zippel@linux-m68k.org|ChangeSet|20020503210330|37095 > > > > > > > > > > I know this is an old thread but can anyone tell me if this problem is > > > resolved in the current 2.6.6 kernel? > > > > > > > There's an utterly ancient patch in -mm which might fix this. > > > > http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.6/2.6.6-mm4/broken-out/get_user_pages-handle-VM_IO.patch > > [ 2nd send -- corporate email system in the throes of being scrambled / updated ] > > Andrew, > I have been using this patch for ages. Any chance of it being forwared to > the official tree?
That patch had its first birthday last week. I wrote it in response to some long-forgotten problem, failed to changelog it at the time then forgot why I wrote it. I kept it in the hope that I'd remember why I wrote it. I subsequently wrote a best-effort changelog but am unconvinced by it. Ho hum.
Let me genuflect a bit. I guess we can be reasonably confident it won't break anything. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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