From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Julia Lawall <julia.lawall@inria.fr>
Cc: kernel-janitors@vger.kernel.org,
Jiri Slaby <jirislaby@kernel.org>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/14] pch_uart: drop double zeroing
Date: Sun, 27 Sep 2020 12:11:36 +0000 [thread overview]
Message-ID: <20200927121136.GA164938@kroah.com> (raw)
In-Reply-To: <alpine.DEB.2.22.394.2009201443590.2966@hadrien>
On Sun, Sep 20, 2020 at 02:47:11PM +0200, Julia Lawall wrote:
>
>
> On Sun, 20 Sep 2020, Greg Kroah-Hartman wrote:
>
> > On Sun, Sep 20, 2020 at 01:26:13PM +0200, Julia Lawall wrote:
> > > sg_init_table zeroes its first argument, so the allocation of that argument
> > > doesn't have to.
> > >
> > > the semantic patch that makes this change is as follows:
> > > (http://coccinelle.lip6.fr/)
> > >
> > > // <smpl>
> > > @@
> > > expression x,n,flags;
> > > @@
> > >
> > > x > > > - kcalloc
> > > + kmalloc_array
> > > (n,sizeof(struct scatterlist),flags)
> > > ...
> > > sg_init_table(x,n)
> > > // </smpl>
> > >
> > > Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
> >
> > It inits the first entry in the array, but what about all of the other
> > ones? Is that "safe" to have uninitialized data in them like your
> > change causes to happen?
>
> Sorry, I don't follow. The complete code is:
>
> priv->sg_tx_p = kcalloc(num, sizeof(struct scatterlist), GFP_ATOMIC);
> if (!priv->sg_tx_p) {
> dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
> return 0;
> }
>
> sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
>
> and the definition of sg_init_table is:
>
> void sg_init_table(struct scatterlist *sgl, unsigned int nents)
> {
> memset(sgl, 0, sizeof(*sgl) * nents);
> sg_init_marker(sgl, nents);
> }
Ah, missed the "* nents" thing there, sorry, my fault.
greg k-h
next prev parent reply other threads:[~2020-09-27 12:11 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-20 11:26 [PATCH 00/14] drop double zeroing Julia Lawall
2020-09-20 11:26 ` [PATCH 01/14] pch_uart: " Julia Lawall
2020-09-20 12:14 ` Greg Kroah-Hartman
2020-09-20 12:47 ` Julia Lawall
2020-09-27 12:11 ` Greg Kroah-Hartman [this message]
2020-09-20 11:26 ` [PATCH 02/14] target/rd: " Julia Lawall
2020-10-08 2:31 ` Martin K. Petersen
2020-09-20 11:26 ` [PATCH 03/14] dpaa2-eth: " Julia Lawall
2020-09-21 2:09 ` David Miller
2020-09-20 11:26 ` [PATCH 04/14] dmaengine: sh: " Julia Lawall
2020-10-05 4:48 ` Vinod Koul
2020-09-20 11:26 ` [PATCH 05/14] RDMA/efa: " Julia Lawall
2020-09-21 7:13 ` Gal Pressman
2020-09-22 23:27 ` Jason Gunthorpe
2020-09-20 11:26 ` [PATCH 06/14] block: " Julia Lawall
2020-09-23 15:18 ` Jens Axboe
2020-09-20 11:26 ` [PATCH 07/14] RDS: " Julia Lawall
2020-09-21 2:09 ` David Miller
2020-09-20 11:26 ` [PATCH 08/14] xprtrdma: " Julia Lawall
2020-09-20 15:37 ` Chuck Lever
2020-09-20 11:26 ` [PATCH 09/14] dmaengine: rcar-dmac: " Julia Lawall
2020-10-05 4:48 ` Vinod Koul
2020-09-20 11:26 ` [PATCH 10/14] iwlwifi: dbg_ini: " Julia Lawall
2020-09-20 11:26 ` [PATCH 11/14] spi/topcliff-pch: " Julia Lawall
2020-09-20 11:26 ` [PATCH 12/14] [media] saa7146: " Julia Lawall
2020-09-20 11:26 ` [PATCH 13/14] misc: mic: " Julia Lawall
2020-09-20 11:26 ` [PATCH 14/14] PCI/P2PDMA: " Julia Lawall
2020-09-28 22:24 ` Bjorn Helgaas
2020-09-21 16:58 ` [PATCH 00/14] " Mark Brown
2020-09-23 15:10 ` Rolf Reintjes
2020-09-23 15:16 ` Mark Brown
2020-10-13 22:42 ` Martin K. Petersen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200927121136.GA164938@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=jirislaby@kernel.org \
--cc=julia.lawall@inria.fr \
--cc=kernel-janitors@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).