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From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Guenter Roeck <linux@roeck-us.net>,
	Jean Delvare <jdelvare@suse.com>,
	linux-doc <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-hwmon@vger.kernel.org,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: Re: [PATCH v2 5/6] devres: provide devm_krealloc()
Date: Thu, 2 Jul 2020 15:11:44 +0200
Message-ID: <CAMRc=Mc6dWCtnFT_SMGLUsggf68i3y7Njr61NyDQ7KeQ-rSErg@mail.gmail.com> (raw)
In-Reply-To: <20200702124258.GA1882489@kroah.com>

On Thu, Jul 2, 2020 at 2:42 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Mon, Jun 29, 2020 at 08:50:07AM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Implement the managed variant of krealloc(). This function works with
> > all memory allocated by devm_kmalloc() (or devres functions using it
> > implicitly like devm_kmemdup(), devm_kstrdup() etc.).
> >
> > Managed realloc'ed chunks can be manually released with devm_kfree().
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

[snip!]

>
> That's a lot of logic that does not seem to match up with the krealloc()
> logic in mm/slab_common.c, are you sure we need to do all of that?
>

What are you referring to exactly? The check for rodata? It's because
devm_kfree() handles this case, while regular kfree() (or krealloc())
doesn't - there's kfree_const() but no devm_kfree_const().

> Who wants this?

The hwmon commit I mentioned in my response to patch 6/6 explicitly
mentions the lack of this helper.

Bartosz

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29  6:50 [PATCH v2 0/6] devres: provide and use devm_krealloc() Bartosz Golaszewski
2020-06-29  6:50 ` [PATCH v2 1/6] devres: remove stray space from devm_kmalloc() definition Bartosz Golaszewski
2020-06-29  6:50 ` [PATCH v2 2/6] devres: move the size check from alloc_dr() into a separate function Bartosz Golaszewski
2020-06-29  6:50 ` [PATCH v2 3/6] device: remove 'extern' attribute from function prototypes in device.h Bartosz Golaszewski
2020-06-29  6:50 ` [PATCH v2 4/6] devres: handle zero size in devm_kmalloc() Bartosz Golaszewski
2020-07-10 13:46   ` Jon Hunter
2020-07-10 16:03     ` Bartosz Golaszewski
2020-07-10 16:11       ` Jon Hunter
2020-07-10 16:24         ` Bartosz Golaszewski
2020-07-10 16:30           ` Jon Hunter
2020-06-29  6:50 ` [PATCH v2 5/6] devres: provide devm_krealloc() Bartosz Golaszewski
2020-07-02 12:42   ` Greg Kroah-Hartman
2020-07-02 13:11     ` Bartosz Golaszewski [this message]
2020-07-06 16:38       ` Bartosz Golaszewski
2020-07-06 16:41         ` Greg Kroah-Hartman
2020-07-10 13:32         ` Greg Kroah-Hartman
2020-06-29  6:50 ` [PATCH v2 6/6] hwmon: pmbus: use more devres helpers Bartosz Golaszewski
2020-06-29 16:32   ` Guenter Roeck
2020-07-02 12:44   ` Greg Kroah-Hartman
2020-07-02 13:06     ` Bartosz Golaszewski
2020-07-02 14:29     ` Guenter Roeck
2020-07-02 12:44 ` [PATCH v2 0/6] devres: provide and use devm_krealloc() Greg Kroah-Hartman

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