From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kenneth Lee Subject: Re: [PATCH v3] IB/umem: Release pid in error and ODP flow Date: Wed, 4 Jan 2017 15:07:04 +0800 Message-ID: <20170104070704.GC228559@Turing-Arch-b> References: <1483093109-188428-1-git-send-email-liguozhu@hisilicon.com> <20170101064712.GQ26885@mtr-leonro.local> <20170103023250.GA228559@Turing-Arch-b> <20170103101224.GH12077@mtr-leonro.local> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <20170103101224.GH12077-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Leon Romanovsky Cc: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, egtvedt-BrfabpQBY5qlHtIdYg32fQ@public.gmane.org, vgupta-HKixBCOQz3hWk0Htik3J/w@public.gmane.org, dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, lstoakes-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, krzk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sebott-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, markb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Tue, Jan 03, 2017 at 12:12:24PM +0200, Leon Romanovsky wrote: > Date: Tue, 3 Jan 2017 12:12:24 +0200 > From: Leon Romanovsky > To: Kenneth Lee > CC: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, > robin.murphy-5wv7dgnIgG8@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, egtvedt-BrfabpQBY5qlHtIdYg32fQ@public.gmane.org, > vgupta-HKixBCOQz3hWk0Htik3J/w@public.gmane.org, dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, lstoakes-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, > krzk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sebott-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, markb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, > linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > Subject: Re: [PATCH v3] IB/umem: Release pid in error and ODP flow > User-Agent: Mutt/1.7.2 (2016-11-26) > Message-ID: <20170103101224.GH12077-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org> > > On Tue, Jan 03, 2017 at 10:32:50AM +0800, Kenneth Lee wrote: > > On Sun, Jan 01, 2017 at 08:47:12AM +0200, Leon Romanovsky wrote: > > > Date: Sun, 1 Jan 2017 08:47:12 +0200 > > > From: Leon Romanovsky > > > To: Kenneth Lee > > > CC: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, > > > robin.murphy-5wv7dgnIgG8@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, egtvedt-BrfabpQBY5qlHtIdYg32fQ@public.gmane.org, > > > vgupta-HKixBCOQz3hWk0Htik3J/w@public.gmane.org, dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, lstoakes-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, > > > krzk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sebott-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, markb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, > > > linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > > > Subject: Re: [PATCH v3] IB/umem: Release pid in error and ODP flow > > > User-Agent: Mutt/1.7.2 (2016-11-26) > > > Message-ID: <20170101064712.GQ26885-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org> > > > > > > On Fri, Dec 30, 2016 at 06:18:29PM +0800, Kenneth Lee wrote: > > > > There are two bugfixes in this patch: > > > > > > > > Fixes: 87773dd56d54 ("IB: ib_umem_release() should decrement mm->pinned_vm from ib_umem_get") > > > > This patch introduce the get_task_pid but not put it back on all error > > > > path > > > > > > > > Fixes: 8ada2c1c0c1d ("IB/core: Add support for on demand paging regions") > > > > This patch introduce a ODP flow without release pid before enter it > > > > > > > > > > > > Signed-off-by: Kenneth Lee > > > > Reviewed-by: Haggai Eran > > > > --- > > > > Change from v1 to v2: > > > > Correcting the patch title and description > > > > Change from v2 to v3: > > > > Update the title and add "Fixes" fields in the description > > > > > > OK, > > > > > > I see that you still didn't read Documentation/SubmittingPatches. You > > > must read that document before you are sending patches. > > > > > > But I'll stop here, the code is correct (it fixes bugs) and commit message > > > more usefull than before. > > > > > > > > > > > > > > drivers/infiniband/core/umem.c | 2 ++ > > > > 1 file changed, 2 insertions(+) > > > > > > > > diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c > > > > index 1e62a5f..4609b92 100644 > > > > --- a/drivers/infiniband/core/umem.c > > > > +++ b/drivers/infiniband/core/umem.c > > > > @@ -134,6 +134,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, > > > > IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND)); > > > > > > > > if (access & IB_ACCESS_ON_DEMAND) { > > > > + put_pid(umem->pid); > > > > ret = ib_umem_odp_get(context, umem); > > > > if (ret) { > > > > kfree(umem); > > > > @@ -149,6 +150,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, > > > > > > > > page_list = (struct page **) __get_free_page(GFP_KERNEL); > > > > if (!page_list) { > > > > + put_pid(umem->pid); > > > > kfree(umem); > > > > return ERR_PTR(-ENOMEM); > > > > } > > > > -- > > > > 1.9.1 > > > > > > > > -- > > > > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > > > > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > Thanks, > > > > I did read the doc, but maybe I mis-understant some points. Could you please > > point it out? > > Fixes line should be placed above bottom signatures. > > As an example of properly written patch, you can take a look on the > following patch [1] from Steve. > > [1] http://marc.info/?l=linux-rdma&m=148244272205411&w=2 Thank you. A sample help a lot. But please allow me to argue a little: Documentation/process/submitting-patches.rst does really not mention where Fixes tags should be put:) > > > > > And sorry. please ignore the last message. I forget to use a bottom-post style. > > > > > > > > -- > > -Kenneth(Hisilicon) -- -Kenneth(Hisilicon) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html