Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:60634 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756442Ab3AHOqJ (ORCPT ); Tue, 8 Jan 2013 09:46:09 -0500 Date: Tue, 8 Jan 2013 09:46:04 -0500 From: "J. Bruce Fields" To: Joe Perches Cc: Trond Myklebust , "David S. Miller" , linux-nfs@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Tom Tucker , steved@redhat.com, Tom Talpey Subject: Re: [PATCH] sunrpc: verbs: Avoid 1kb stack Message-ID: <20130108144604.GB16343@fieldses.org> References: <1357587696.21481.48.camel@joe-AO722> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1357587696.21481.48.camel@joe-AO722> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Mon, Jan 07, 2013 at 11:41:36AM -0800, Joe Perches wrote: > 16 * 64 is a bit much. > Use kmalloc_array instead. I thought there was some reason we didn't do this. Grepping up through the callers.... It looks like the result is xprt_rdma_send_request returns -EIO, and as far as I can tell that gets passed up to the application on the client. That doesn't sound right. --b. > > Signed-off-by: Joe Perches > --- > net/sunrpc/xprtrdma/verbs.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c > index 745973b..9cfebb4 100644 > --- a/net/sunrpc/xprtrdma/verbs.c > +++ b/net/sunrpc/xprtrdma/verbs.c > @@ -1736,8 +1736,13 @@ rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, > int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : > IB_ACCESS_REMOTE_READ); > struct rpcrdma_mr_seg *seg1 = seg; > - struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS]; > int len, i, rc = 0; > + struct ib_phys_buf *ipb = kmalloc_array(RPCRDMA_MAX_DATA_SEGS, > + sizeof(*ipb), > + GFP_KERNEL); > + > + if (!ipb) > + return -ENOMEM; > > if (*nsegs > RPCRDMA_MAX_DATA_SEGS) > *nsegs = RPCRDMA_MAX_DATA_SEGS; > @@ -1770,6 +1775,9 @@ rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, > seg1->mr_len = len; > } > *nsegs = i; > + > + kfree(ipb); > + > return rc; > } > > >