Pull coccinelle updates from Julia Lawall:

 - Update MAINTAINERS information (mailing list, web page, etc).

 - Add a semantic patch from Wen Yang to check for do_div calls that may
   cause truncation, motivated by commit b0ab99e7736a ("sched: Fix
   possible divide by zero in avg_atom() calculation")

* tag 'coccinelle-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux:
  coccinelle: update Coccinelle entry
  coccinelle: semantic patch to check for inappropriate do_div() calls

do_div() does a 64-by-32 division.
When the divisor is unsigned long, u64, or s64,
do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.
This semantic patch is inspired by Mateusz Guzik's patch:
commit b0ab99e7736a ("sched: Fix possible divide by zero in avg_atom() calculation")

Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
Cc: Gilles Muller <Gilles.Muller@lip6.fr>
Cc: Nicolas Palix <nicolas.palix@imag.fr>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Matthias Maennich <maennich@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: cocci@systeme.lip6.fr
Cc: linux-kernel@vger.kernel.org

Currently use_after_iter.cocci generates false positives for code of the
following form:
~~~
	list_for_each_entry(d, &ddata->irq_list, node) {
		if (irq == d->irq)
			break;
	}

	if (list_entry_is_head(d, &ddata->irq_list, node))
		return IRQ_NONE;
~~~
[This specific example comes from drivers/power/supply/cpcap-battery.c]

Most list macros use list_entry_is_head() as loop exit condition meaning it
is not unsafe to reuse pos (a.k.a. d) in the code above.

Let's avoid reporting these cases.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

Commit 453431a54934 ("mm, treewide: rename kzfree() to
kfree_sensitive()") renamed kzfree() to kfree_sensitive(),
it should be applied to coccinelle.

Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Acked-by: Denis Efremov <efremov@linux.com>

Using kobj_to_dev() instead of container_of() is not universally
accepted among maintainers as an improvement. The warning leads to
repeated patch submissions that won't be accepted. Remove the script.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Denis Efremov <efremov@linux.com>
Cc: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Acked-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Denis Efremov <efremov@linux.com>

There is a standard idiom for "if 'ret' holds an error, return it":
	return ret < 0 ? ret : 0;

Developers prefer to keep the things as they are because stylistic
change to "return min(ret, 0);" breaks readability.

Let's suppress automatic generation for this type of patches.

Signed-off-by: Denis Efremov <efremov@linux.com>

Kfree.cocci only supports org and report mode, so the *s (used for
context mode) are not useful.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

The IRQF_ONESHOT should be present for threaded IRQ using default
primary handler.  However intetrupt of many child devices, e.g. children
of MFD, is nested thus the IRQF_ONESHOT is not needed.  The coccinelle
message about error misleads submitters and reviewers about the severity
of the issue, so make it a warning and mention possible false positive.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

Check for opencoded swap() implementation.

Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>

Remove the documentation link from the warning message because commit
3942ea7a10c9 ("deprecated.rst: Remove now removed uninitialized_var")
removed the section from documentation. Update the rule documentation
accordingly.

Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>