linux-kernel - Re: [PATCH] staging: kpc2000: kpc_dma: Convert get_user_pages() --> pin_user

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Message-ID: <20200608191635.GA30374@kadam>
Date:   Mon, 8 Jun 2020 22:16:35 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Souptick Joarder <jrdr.linux@...il.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Bharath Vedartham <linux.bhar@...il.com>,
        harshjain32@...il.com, Greg KH <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Simon Sandström <simon@...anor.nu>,
        jane.pnx9@...il.com
Subject: Re: [PATCH] staging: kpc2000: kpc_dma: Convert get_user_pages() -->
 pin_user_pages()

On Mon, Jun 08, 2020 at 12:05:57PM -0700, John Hubbard wrote:
> On 2020-06-08 12:01, Souptick Joarder wrote:
> > On Mon, Jun 1, 2020 at 7:15 AM John Hubbard <jhubbard@...dia.com> wrote:
> > > 
> > > On 2020-05-31 10:51, Souptick Joarder wrote:
> > > > In 2019, we introduced pin_user_pages*() and now we are converting
> > > > get_user_pages*() to the new API as appropriate. [1] & [2] could
> > > > be referred for more information.
> > > > 
> > > > When pin_user_pages() returns numbers of partially mapped pages,
> > > > those pages were not unpinned as part of error handling. Fixed
> > > > it as part of this patch.
> > > > 
> > > 
> > > Hi Souptick,
> > > 
> > > btw, Bharath (+cc) attempted to do the "put" side of this, last year.
> > > That got as far as a v4 patch [1], and then I asked him to let me put
> > > it into my tree. But then it didn't directly apply anymore after the
> > > whole design moved to pin+unpin, and so here we are now.
> > > 
> > > 
> > > If Bharath is still doing kernel work, you might offer him a Co-Developed-by:
> > > tag (see https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html).
> > 
> > Sure, will add him as *Co-Developed-by*
> > > 
> 
> 
> Yes, but it's best to wait and see if he responds, before adding that tag, because
> it also required a Signed-off-by from him.

Souptick is porting patches from your tree?  It's not clear to me how
Bharath actually helped author this patch.

regards,
dan carpenter