This is a note to let you know that we have just queued up the patch titled
Subject: xfs: eagerly remove vmap mappings to avoid upsetting Xen to the 2.6.23-stable tree. Its filename is xen-xfs-unmap.patch A git repo of this tree can be found at http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary >From [EMAIL PROTECTED] Fri Oct 12 14:33:36 2007 From: Jeremy Fitzhardinge <[EMAIL PROTECTED]> Date: Fri, 12 Oct 2007 14:11:42 -0700 Subject: xfs: eagerly remove vmap mappings to avoid upsetting Xen To: LKML <linux-kernel@vger.kernel.org> Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], Mark Williamson <[EMAIL PROTECTED]>, XFS masters <[EMAIL PROTECTED]>, Chris Wright <[EMAIL PROTECTED]>, Andi Kleen <[EMAIL PROTECTED]>, Morten Bøgeskov <[EMAIL PROTECTED]>, Andrew Morton <[EMAIL PROTECTED]>, Keir Fraser <[EMAIL PROTECTED]>, Stable kernel <[EMAIL PROTECTED]> Message-ID: <[EMAIL PROTECTED]> Content-Disposition: inline; filename=xen-xfs-unmap.patch From: Jeremy Fitzhardinge <[EMAIL PROTECTED]> patch ace2e92e193126711cb3a83a3752b2c5b8396950 in mainline. XFS leaves stray mappings around when it vmaps memory to make it virtually contigious. This upsets Xen if one of those pages is being recycled into a pagetable, since it finds an extra writable mapping of the page. This patch solves the problem in a brute force way, by making XFS always eagerly unmap its mappings. [ Stable: This works around a bug in 2.6.23. We may come up with a better solution for mainline, but this seems like a low-impact fix for the stable kernel. ] Signed-off-by: Jeremy Fitzhardinge <[EMAIL PROTECTED]> Cc: XFS masters <[EMAIL PROTECTED]> Cc: Morten =?utf-8?q?B=C3=B8geskov?= <[EMAIL PROTECTED]> Cc: Mark Williamson <[EMAIL PROTECTED]> Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]> --- fs/xfs/linux-2.6/xfs_buf.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/fs/xfs/linux-2.6/xfs_buf.c +++ b/fs/xfs/linux-2.6/xfs_buf.c @@ -187,6 +187,19 @@ free_address( { a_list_t *aentry; +#ifdef CONFIG_XEN + /* + * Xen needs to be able to make sure it can get an exclusive + * RO mapping of pages it wants to turn into a pagetable. If + * a newly allocated page is also still being vmap()ed by xfs, + * it will cause pagetable construction to fail. This is a + * quick workaround to always eagerly unmap pages so that Xen + * is happy. + */ + vunmap(addr); + return; +#endif + aentry = kmalloc(sizeof(a_list_t), GFP_NOWAIT); if (likely(aentry)) { spin_lock(&as_lock); Patches currently in stable-queue which might be from [EMAIL PROTECTED] are queue-2.6.23/xen-handle-lazy-cr3-on-unpin.patch queue-2.6.23/xen-multicall-callbacks.patch queue-2.6.23/xen-fix-register_vcpu_info.patch queue-2.6.23/xen-xfs-unmap.patch - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/