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From: Julia Lawall <julia.lawall@inria.fr>
To: Wen Yang <wenyang@linux.alibaba.com>
Cc: Gilles Muller <Gilles.Muller@lip6.fr>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	Michal Marek <michal.lkml@markovi.net>,
	Matthias Maennich <maennich@google.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] coccinelle: semantic patch to check for inappropriate do_div() calls
Date: Tue, 7 Jan 2020 18:25:07 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.21.2001071823060.3004@hadrien> (raw)
In-Reply-To: <20200107170240.47207-1-wenyang@linux.alibaba.com>

> +@depends on context@
> +expression f;
> +long l;
> +unsigned long ul;
> +u64 ul64;
> +s64 sl64;
> +
> +@@
> +(
> +* do_div(f, l);
> +|
> +* do_div(f, ul);
> +|
> +* do_div(f, ul64);
> +|
> +* do_div(f, sl64);
> +)

This part is not really ideal.  For the reports, you filter for the
constants, but here you don't do anything.  You can put some python code
in the matching of the metavariables:

unsigned long ul : script:python() { whatever you want to check on ul };

Then it will only match if the condition is satisfied.

julia

WARNING: multiple messages have this Message-ID
From: Julia Lawall <julia.lawall@inria.fr>
To: Wen Yang <wenyang@linux.alibaba.com>
Cc: Michal Marek <michal.lkml@markovi.net>,
	Gilles Muller <Gilles.Muller@lip6.fr>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	Matthias Maennich <maennich@google.com>,
	linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	cocci@systeme.lip6.fr
Subject: Re: [Cocci] [PATCH v2] coccinelle: semantic patch to check for inappropriate do_div() calls
Date: Tue, 7 Jan 2020 18:25:07 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.21.2001071823060.3004@hadrien> (raw)
In-Reply-To: <20200107170240.47207-1-wenyang@linux.alibaba.com>

> +@depends on context@
> +expression f;
> +long l;
> +unsigned long ul;
> +u64 ul64;
> +s64 sl64;
> +
> +@@
> +(
> +* do_div(f, l);
> +|
> +* do_div(f, ul);
> +|
> +* do_div(f, ul64);
> +|
> +* do_div(f, sl64);
> +)

This part is not really ideal.  For the reports, you filter for the
constants, but here you don't do anything.  You can put some python code
in the matching of the metavariables:

unsigned long ul : script:python() { whatever you want to check on ul };

Then it will only match if the condition is satisfied.

julia
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  reply	other threads:[~2020-01-07 17:25 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 17:02 [PATCH v2] coccinelle: semantic patch to check for inappropriate do_div() calls Wen Yang
2020-01-07 17:02 ` [Cocci] " Wen Yang
2020-01-07 17:25 ` Julia Lawall [this message]
2020-01-07 17:25   ` Julia Lawall
2020-01-10 13:11   ` Wen Yang
2020-01-10 13:11     ` [Cocci] " Wen Yang
2020-01-09 10:35 ` Markus Elfring
2020-01-09 10:35   ` [Cocci] " Markus Elfring
2020-01-09 10:35   ` Markus Elfring
2020-01-09 10:41   ` Julia Lawall
2020-01-09 10:41     ` [Cocci] " Julia Lawall
2020-01-09 10:41     ` Julia Lawall
2020-01-09 12:00     ` [v2] " Markus Elfring
2020-01-09 12:00       ` [Cocci] " Markus Elfring
2020-01-09 12:00       ` Markus Elfring
2020-01-09 12:04       ` Julia Lawall
2020-01-09 12:04         ` [Cocci] " Julia Lawall
2020-01-09 12:04         ` Julia Lawall
2020-01-09 12:14         ` Markus Elfring
2020-01-09 12:14           ` [Cocci] " Markus Elfring
2020-01-09 12:14           ` Markus Elfring
2020-01-09 12:17           ` Julia Lawall
2020-01-09 12:17             ` [Cocci] " Julia Lawall
2020-01-09 12:17             ` Julia Lawall
2020-01-09 12:21             ` Markus Elfring
2020-01-09 12:21               ` [Cocci] " Markus Elfring
2020-01-09 12:21               ` Markus Elfring
2020-01-10 10:00 ` [PATCH v2] " Markus Elfring
2020-01-10 10:00   ` [Cocci] " Markus Elfring
2020-01-10 10:00   ` Markus Elfring
2020-01-10 12:34   ` Julia Lawall
2020-01-10 12:34     ` [Cocci] " Julia Lawall
2020-01-10 12:34     ` Julia Lawall
2020-01-10 15:46     ` [v2] coccinelle: semantic code search " Markus Elfring
2020-01-10 15:46       ` [Cocci] " Markus Elfring
2020-01-10 15:46       ` Markus Elfring

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