Re: [OOPS] 2.6.7-rc2: mpage_writepage

[Russell King]

On Tue, Jun 01, 2004 at 03:00:25PM +0100, Russell King wrote:
> I've been trying to look at a cache problem on ARM PXA, but unfortunately
> hit the following problem:
> 
> Opening 'l/testfile'
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> PC is at 0x0
> LR is at mpage_writepage+0x1fc/0x5e0

Ok, I intend to work around this bug by the following:

--- orig/fs/mpage.c	Thu Apr 22 15:28:27 2004
+++ linux/fs/mpage.c	Tue Jun  1 17:44:11 2004
@@ -619,7 +619,7 @@
 	writepage = NULL;
 	if (get_block == NULL)
 		writepage = mapping->a_ops->writepage;
-
+if (!get_block && !writepage) return 0; /* save us from ramfs */
 	pagevec_init(&pvec, 0);
 	if (wbc->sync_mode == WB_SYNC_NONE) {
 		index = mapping->writeback_index; /* Start from prev offset */

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core
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