The patch titled
mm: pagecache write deadlocks zerolength fix
has been added to the -mm tree. Its filename is
mm-fix-pagecache-write-deadlocks-zerolength-fix.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: pagecache write deadlocks zerolength fix
From: Nick Piggin <npiggin@xxxxxxx>
writev with a zero-length segment is a noop, and we shouldn't return EFAULT.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/pagemap.h | 6 ++++++
1 files changed, 6 insertions(+)
diff -puN include/linux/pagemap.h~mm-fix-pagecache-write-deadlocks-zerolength-fix include/linux/pagemap.h
--- a/include/linux/pagemap.h~mm-fix-pagecache-write-deadlocks-zerolength-fix
+++ a/include/linux/pagemap.h
@@ -198,6 +198,9 @@ static inline int fault_in_pages_writeab
{
int ret;
+ if (unlikely(size == 0))
+ return 0;
+
/*
* Writing zeroes into userspace here is OK, because we know that if
* the zero gets there, we'll be overwriting it.
@@ -222,6 +225,9 @@ static inline int fault_in_pages_readabl
volatile char c;
int ret;
+ if (unlikely(size == 0))
+ return 0;
+
ret = __get_user(c, uaddr);
if (ret == 0) {
const char __user *end = uaddr + size - 1;
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
mm-only-mm-debug-write-deadlocks.patch
mm-fix-pagecache-write-deadlocks.patch
mm-fix-pagecache-write-deadlocks-comment.patch
mm-fix-pagecache-write-deadlocks-mm-pagecache-write-deadlocks-efault-fix.patch
mm-fix-pagecache-write-deadlocks-zerolength-fix.patch
fs-prepare_write-fixes.patch
fs-prepare_write-fixes-fuse-fix.patch
fs-prepare_write-fixes-jffs-fix.patch
fs-prepare_write-fixes-fat-fix.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
mm-arch-do_page_fault-vs-in_atomic.patch
mm-pagefault_disableenable.patch
mm-kummap_atomic-vs-in_atomic.patch
radix-tree-rcu-lockless-readside.patch
-
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