On Thu, May 13, 2010 at 4:51 AM, Albert Herranz <albert_herranz@xxxxxxxx> wrote: > This patch fixes a problem observed while using fb_defio with a short > delay on a PowerPC platform. > > It is possible that page_mkclean() is invoked in the deferred io work > function _before_ a PTE has been marked dirty. In this case, the page > is removed from the defio pagelist but page_mkclean() does not > write-protect the page again. The end result is that defio ignores all > subsequent writes to the page and the corresponding portions of the > framebuffer never get updated. > > The fix consists in keeping track of the pages with non-dirty PTEs, > re-checking them again on the next deferred io work iteration. > Note that those pages are not passed to the defio callback as they are > not written by userspace yet. > > Signed-off-by: Albert Herranz <albert_herranz@xxxxxxxx> Looks good to me. Thanks for the bugfix. Acked-by: Jaya Kumar <jayakumar.lkml@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
