3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit 9e8c2af96e0d2d5fe298dd796fb6bc16e888a48d upstream.
... it does that itself (via kmap_atomic())
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/file.c | 5 -----
fs/fuse/file.c | 2 --
mm/filemap.c | 3 ---
3 files changed, 10 deletions(-)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -425,13 +425,8 @@ static noinline int btrfs_copy_from_user
struct page *page = prepared_pages[pg];
/*
* Copy data from userspace to the current page
- *
- * Disable pagefault to avoid recursive lock since
- * the pages are already locked
*/
- pagefault_disable();
copied = iov_iter_copy_from_user_atomic(page, i, offset, count);
- pagefault_enable();
/* Flush processor's dcache for this page */
flush_dcache_page(page);
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1003,9 +1003,7 @@ static ssize_t fuse_fill_write_pages(str
if (mapping_writably_mapped(mapping))
flush_dcache_page(page);
- pagefault_disable();
tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes);
- pagefault_enable();
flush_dcache_page(page);
mark_page_accessed(page);
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2188,7 +2188,6 @@ size_t iov_iter_copy_from_user_atomic(st
char *kaddr;
size_t copied;
- BUG_ON(!in_atomic());
kaddr = kmap_atomic(page);
if (likely(i->nr_segs == 1)) {
int left;
@@ -2562,9 +2561,7 @@ again:
if (mapping_writably_mapped(mapping))
flush_dcache_page(page);
- pagefault_disable();
copied = iov_iter_copy_from_user_atomic(page, i, offset, bytes);
- pagefault_enable();
flush_dcache_page(page);
mark_page_accessed(page);
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html