Coccinelle Archive on lore.kernel.org
 help / color / Atom feed
From: Julia Lawall <julia.lawall@lip6.fr>
To: wen.yang99@zte.com.cn
Cc: kernel-janitors@vger.kernel.org, michal.lkml@markovi.net,
	yellowriver2010@hotmail.com, nicolas.palix@imag.fr,
	linux-kernel@vger.kernel.org, Markus.Elfring@web.de,
	cheng.shengyu@zte.com.cn, cocci@systeme.lip6.fr
Subject: Re: [Cocci] [v6] coccinelle: semantic code search for missing put_device()
Date: Mon, 18 Feb 2019 07:43:26 +0100 (CET)
Message-ID: <alpine.DEB.2.21.1902180740550.3111@hadrien> (raw)
In-Reply-To: <201902181122502228026@zte.com.cn>


[-- Attachment #1: Type: text/plain, Size: 1295 bytes --]



On Mon, 18 Feb 2019, wen.yang99@zte.com.cn wrote:

> > > when != e = id achieves this behavior.
> >
> > I can not agree to this view completely because of the meaning that is connected
> > with these variable identifiers.
> >
> > Both metavariables share the kind “expression”. So I can imagine
> > that there is an intersection for the source code match possibility.
> > But one was intentionally restricted to the kind “local idexpression” so far.
> >
> > Which data element should not get reassigned here (before a corresponding
> > null pointer check)?
> >
>
> Thank you for your comments.
> We did some experiments:
> +id = of_find_device_by_node@p1(x)
> +... when != e = id
> ...
> Or:
> ...
> + ... when != id = e
>
> The number of issuses found by these two methods is the same.
> When != e = id achieves this behavior.

They are the same because neither issue arises.  I would have a hard time
saying which one is more reasonable to test, since both are extremely
unlikely.

julia


>
> In addition, we feel that we should probably accept this patch first, use it to find more memory leaks, and solve the actual problems in the kernel code.
> As for the patch itself, we can continue to pursue perfect in the process of using it to solve practical problems.
>
> Regards,
> Wen

[-- Attachment #2: Type: text/plain, Size: 136 bytes --]

_______________________________________________
Cocci mailing list
Cocci@systeme.lip6.fr
https://systeme.lip6.fr/mailman/listinfo/cocci

  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-16 16:05 [Cocci] [PATCH v6] " Wen Yang
2019-02-16 16:33 ` Julia Lawall
2019-02-16 18:39 ` [Cocci] [v6] " Markus Elfring
2019-02-17  2:32   ` [Cocci] 答复: " Wen Yang
2019-02-17  7:42     ` Markus Elfring
2019-02-17  9:50 ` [Cocci] [PATCH v6] " Markus Elfring
2019-02-17 11:37   ` Julia Lawall
2019-02-17 11:42     ` Markus Elfring
2019-02-17 11:48       ` Julia Lawall
2019-02-17 12:00         ` [Cocci] [v6] " Markus Elfring
2019-02-17 12:05           ` Julia Lawall
2019-02-17 12:20             ` Markus Elfring
2019-02-17 12:52               ` Julia Lawall
2019-02-17 13:14                 ` Markus Elfring
2019-02-18  3:22                   ` wen.yang99
2019-02-18  6:43                     ` Julia Lawall [this message]
2019-02-18  8:19                       ` Markus Elfring
2019-02-19  2:14                         ` wen.yang99
2019-02-19  7:04                           ` Julia Lawall
2019-02-19  8:12                             ` Markus Elfring
2019-02-19  8:29                           ` Markus Elfring
2019-02-19  9:09                             ` wen.yang99
2019-02-19  9:30                               ` Markus Elfring
2019-03-06 11:18                           ` Markus Elfring
2019-02-18 21:40                     ` Markus Elfring

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=alpine.DEB.2.21.1902180740550.3111@hadrien \
    --to=julia.lawall@lip6.fr \
    --cc=Markus.Elfring@web.de \
    --cc=cheng.shengyu@zte.com.cn \
    --cc=cocci@systeme.lip6.fr \
    --cc=kernel-janitors@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=michal.lkml@markovi.net \
    --cc=nicolas.palix@imag.fr \
    --cc=wen.yang99@zte.com.cn \
    --cc=yellowriver2010@hotmail.com \
    /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

Coccinelle Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/cocci/0 cocci/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 cocci cocci/ https://lore.kernel.org/cocci \
		cocci@systeme.lip6.fr
	public-inbox-index cocci

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/fr.lip6.systeme.cocci


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git