linux-kernel - Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem

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Message-ID: <20161230102410.GA144330@Turing-Arch-b>
Date:   Fri, 30 Dec 2016 18:24:10 +0800
From:   Kenneth Lee <liguozhu@...ilicon.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     <dledford@...hat.com>, <sean.hefty@...el.com>,
        <hal.rosenstock@...il.com>, <robin.murphy@....com>,
        <jroedel@...e.de>, <egtvedt@...fundet.no>, <vgupta@...opsys.com>,
        <dave.hansen@...ux.intel.com>, <lstoakes@...il.com>,
        <krzk@...nel.org>, <sebott@...ux.vnet.ibm.com>,
        <markb@...lanox.com>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

On Fri, Dec 30, 2016 at 08:55:10AM +0200, Leon Romanovsky wrote:
> Date: Fri, 30 Dec 2016 08:55:10 +0200
> From: Leon Romanovsky <leon@...nel.org>
> To: Kenneth Lee <liguozhu@...ilicon.com>
> CC: dledford@...hat.com, sean.hefty@...el.com, hal.rosenstock@...il.com,
>  robin.murphy@....com, jroedel@...e.de, egtvedt@...fundet.no,
>  vgupta@...opsys.com, dave.hansen@...ux.intel.com, lstoakes@...il.com,
>  krzk@...nel.org, sebott@...ux.vnet.ibm.com, markb@...lanox.com,
>  linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem_get()
> User-Agent: Mutt/1.7.2 (2016-11-26)
> Message-ID: <20161230065510.GL26885@...-leonro.local>
> 
> On Fri, Dec 30, 2016 at 12:50:11PM +0800, Kenneth Lee wrote:
> > Hi, Leon,
> >
> > 1. I do change the title except for the version number itself:) But my English
> > is quite bad, maybe the title is still quite stupid. I can update it according
> > to your advice.
> 
> Yes, please
> The main points are:
> 1. Remove "bugifix", it is not needed.
> 2. Use description in the title and not function names.
> 
> >
> > 2. I catched the bug by reading the final code, not by bisect-ing the old
> > commit. Do you means I should find out which commit introducing the bug? It will
> > not be easily to say which it is because it is a "missing bug", rather than a
> > "introduced bug". Indicate the commit may not help to remove a patch/commit from
> > the stable tree.
> 
> The fixes line won't cause for removal of commit, but to addition of
> yours on top of their code base.
> 
> git blame is your friend.
> 
> one fixes line is:
> Fixes: 8ada2c1c0c1d ("IB/core: Add support for on demand paging regions")
> 
> and the second line is !!!!! NOT !!!!!, you need to go deeper in the logs !!!!!!
> Fixes: f7c6a7b5d599 ("IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules")
> 
> >
> > Could you please give more suggestion? Thanks.
> 
> Please, don't use top-posting for this mailing list.
> It is really-really annoying.
> 
> >
> > On Thu, Dec 29, 2016 at 10:17:56AM +0200, Leon Romanovsky wrote:
> > > Date: Thu, 29 Dec 2016 10:17:56 +0200
> > > From: Leon Romanovsky <leon@...nel.org>
> > > To: Kenneth Lee <liguozhu@...ilicon.com>
> > > CC: dledford@...hat.com, sean.hefty@...el.com, hal.rosenstock@...il.com,
> > >  robin.murphy@....com, jroedel@...e.de, egtvedt@...fundet.no,
> > >  vgupta@...opsys.com, dave.hansen@...ux.intel.com, lstoakes@...il.com,
> > >  krzk@...nel.org, sebott@...ux.vnet.ibm.com, markb@...lanox.com,
> > >  linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
> > > Subject: Re: [PATCH v2] ib umem: bugfix: mixed put_pid()s in ib_umem_get()
> > > User-Agent: Mutt/1.7.2 (2016-11-26)
> > > Message-ID: <20161229081756.GI26885@...-leonro.local>
> > >
> > > On Thu, Dec 29, 2016 at 04:27:28PM +0800, Kenneth Lee wrote:
> > > > There are two bugfixes in this patch:
> > > >
> > > > 1. When the execution go to the ib_umem_odp_get() path, pid should be put
> > > >    back.
> > > > 2. When the memory allocation fail, the pid also should be put back before
> > > >    exit.
> > > >
> > > > Signed-off-by: Kenneth Lee <liguozhu@...ilicon.com>
> > > > Reviewed-by: Haggai Eran <haggaie@...lanox.com>
> > > > ---
> > > > Change from v1 to v2:
> > > >   Correcting the patch title and description
> > >
> > > I don't see any changes except version in the title.
> > > What about anything like this?
> > > [PATCH v3] IB/umem: Release pid in error and ODP flows
> > >
> > > And Fixes line please, it will help to forward it to stable trees.
> > >
> > > Thanks
> >
> >
> >
> > --
> > 			-Kenneth(Hisilicon)

Very helpful. Thank you. I will send the Patch v3 soon.

-- 
			-Kenneth(Hisilicon)