The patch titled
mm: pagecache write deadlocks zerolength fix
has been removed from the -mm tree. Its filename was
mm-fix-pagecache-write-deadlocks-zerolength-fix.patch
This patch was dropped because it is obsolete
------------------------------------------------------
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-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
fs-fix-cont-vs-deadlock-patches.patch
git-block.patch
buffer-memorder-fix.patch
sched-avoid-div-in-rebalance_tick.patch
fs-libfs-buffered-write-leak-fix.patch
mm-revert-generic_file_buffered_write-handle-zero-length-iovec-segments.patch
mm-revert-generic_file_buffered_write-deadlock-on-vectored-write.patch
mm-generic_file_buffered_write-cleanup.patch
mm-debug-write-deadlocks.patch
mm-be-sure-to-trim-blocks.patch
mm-cleanup-pagecache-insertion-operations.patch
mm-generic_file_buffered_write-iovec-cleanup.patch
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