Re: [PATCH v2 5/6] devres: provide devm_krealloc()

Bartosz Golaszewski
2020-07-06T16:38:23Z

On Thu, Jul 2, 2020 at 3:11 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> 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

Hi Greg,

As we've established in the discussion under the iio patch that there
will in fact be more users of this - can this now be merged too?

Bart