mm/fs: delete PF_SWAPWRITE

Source kernel commit: b698f0a1773f7df73f2bb4bfe0e597ea1bb3881f

PF_SWAPWRITE has been redundant since v3.2 commit ee72886d8ed5 ("mm:
vmscan: do not writeback filesystem pages in direct reclaim").

Coincidentally, NeilBrown's current patch "remove inode_congested()"
deletes may_write_to_inode(), which appeared to be the one function which
took notice of PF_SWAPWRITE.  But if you study the old logic, and the
conditions under which may_write_to_inode() was called, you discover that
flag and function have been pointless for a decade.

Link: https://lkml.kernel.org/r/75e80e7-742d-e3bd-531-614db8961e4@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Jan Kara <jack@suse.de>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
index 4fe2378e75081f3fe963e7a4742a70d5d952a73b..18fbe768ed9a82a4a786981ad4e2b369b6d24b37 100644 (file)
--- a/libxfs/xfs_btree.c
+++ b/libxfs/xfs_btree.c
@@ -2815,7 +2815,7 @@ xfs_btree_split_worker(
         * in any way.
         */
        if (args->kswapd)
-               new_pflags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
+               new_pflags |= PF_MEMALLOC | PF_KSWAPD;
 
        current_set_flags_nested(&pflags, new_pflags);
        xfs_trans_set_context(args->cur->bc_tp);