Messages in this thread | | | Subject | Re: vm_ops.page_mkwrite() fails with vmalloc on 2.6.23 | From | Peter Zijlstra <> | Date | Mon, 29 Oct 2007 11:11:57 +0100 |
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On Mon, 2007-10-29 at 01:17 -0700, Jaya Kumar wrote: > On 10/29/07, Andrew Morton <akpm@linux-foundation.org> wrote: > > On Mon, 22 Oct 2007 16:40:57 +0200 Stefani Seibold <stefani@seibold.net> wrote: > > > > > > The problem original occurs with the fb_defio driver (driver/video/fb_defio.c). > > > This driver use the vm_ops.page_mkwrite() handler for tracking the modified pages, > > > which will be in an extra thread handled, to perform the IO and clean and > > > write protect all pages with page_clean(). > > > > > Hi, > > An aside, I just tested that deferred IO works fine on 2.6.22.10/pxa255. > > I understood from the thread that PeterZ is looking into page_mkclean > changes which I guess went into 2.6.23. I'm also happy to help in any > way if the way we're doing fb_defio needs to change.
Yeah, its the truncate race stuff introduced by Nick in d0217ac04ca6591841e5665f518e38064f4e65bd
I'm a bit at a loss on how to go around fixing this. One ugly idea I had was to check page->mapping before going into page_mkwrite() and when that is null, don't bother with the truncate check.
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