Hi all,

Today's linux-next merge of the fs-next tree got a conflict in:

  fs/xfs/libxfs/xfs_btree.c

between commit:

  4d1d71f8b90dc ("xfs: remove dead kswapd flag inheritance from btree split worker")

from the mm tree and commit:

  26f42375404e5 ("xfs: fix NOFS state corruption in btree split worker")

from the xfs tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --combined fs/xfs/libxfs/xfs_btree.c
index 6738d9d1511bc,7effebe297ea0..0000000000000
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@@ -2994,6 -2994,7 +2994,6 @@@ struct xfs_btree_split_args 
  	struct xfs_btree_cur	**curp;
  	int			*stat;		/* success/failure */
  	int			result;
 -	bool			kswapd;	/* allocation in kswapd context */
  	struct completion	*done;
  	struct work_struct	work;
  };
@@@ -3007,18 -3008,39 +3007,18 @@@ xfs_btree_split_worker
  {
  	struct xfs_btree_split_args	*args = container_of(work,
  						struct xfs_btree_split_args, work);
 -	unsigned long		pflags;
 -	unsigned long		new_pflags = 0;
 -	unsigned int		nofs_flags;
 -
 -	/*
 -	 * we are in a transaction context here, but may also be doing work
 -	 * in kswapd context, and hence we may need to inherit that state
 -	 * temporarily to ensure that we don't block waiting for memory reclaim
 -	 * in any way.
 -	 */
 -	if (args->kswapd)
 -		new_pflags |= PF_MEMALLOC | PF_KSWAPD;
 -
 -	current_set_flags_nested(&pflags, new_pflags);
 -
 -	/*
 -	 * Don't use xfs_trans_set_context() here: it would overwrite the
 -	 * caller's saved NOFS state in tp->t_pflags. Use a local scope.
 -	 */
 -	nofs_flags = memalloc_nofs_save();
 +	xfs_trans_set_context(args->cur->bc_tp);
  
  	args->result = __xfs_btree_split(args->cur, args->level, args->ptrp,
  					 args->key, args->curp, args->stat);
  
 -	memalloc_nofs_restore(nofs_flags);
 -	current_restore_flags_nested(&pflags, new_pflags);
 +	xfs_trans_clear_context(args->cur->bc_tp);
  
  	/*
  	 * Do not access args after complete() has run here. We don't own args
  	 * and the owner may run and free args before we return here.
  	 */
  	complete(args->done);
 -
  }
  
  /*
@@@ -3062,7 -3084,7 +3062,7 @@@ xfs_btree_split
  	args.curp = curp;
  	args.stat = stat;
  	args.done = &done;
 -	args.kswapd = current_is_kswapd();
 +
  	INIT_WORK_ONSTACK(&args.work, xfs_btree_split_worker);
  	queue_work(xfs_alloc_wq, &args.work);
  	wait_for_completion(&done);