The patch titled
mm: debug write deadlocks
has been added to the -mm tree. Its filename is
mm-only-mm-debug-write-deadlocks.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: mm: debug write deadlocks
From: Nick Piggin <npiggin@xxxxxxx>
Allow CONFIG_DEBUG_VM to switch off the prefaulting logic, to simulate the
Makes the race much easier to hit.
This probably needn't go upstream.
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/filemap.c | 2 ++
1 files changed, 2 insertions(+)
diff -puN mm/filemap.c~mm-only-mm-debug-write-deadlocks mm/filemap.c
--- a/mm/filemap.c~mm-only-mm-debug-write-deadlocks
+++ a/mm/filemap.c
@@ -2104,6 +2104,7 @@ generic_file_buffered_write(struct kiocb
if (maxlen > bytes)
maxlen = bytes;
+#ifndef CONFIG_DEBUG_VM
/*
* Bring in the user page that we will copy from _first_.
* Otherwise there's a nasty deadlock on copying from the
@@ -2111,6 +2112,7 @@ generic_file_buffered_write(struct kiocb
* up-to-date.
*/
fault_in_pages_readable(buf, maxlen);
+#endif
page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
if (!page) {
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
mm-comment-mmap_sem--lock_page-lockorder.patch
mm-only-mm-debug-write-deadlocks.patch
mm-pagecache-write-deadlocks.patch
oom-dont-kill-unkillable-children-or-siblings.patch
oom-cleanup-messages.patch
oom-less-memdie.patch
mm-incorrect-vm_fault_oom-returns-from-drivers.patch
mm-add-arch_alloc_page.patch
radix-tree-rcu-lockless-readside.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
