linux-kernel - Re: [PATCH v2 1/9] lib: string_helpers: provide kfree

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Message-ID: <CAMpxmJV84C9KTj+z8+BBE2zaiMhRSRcybBO52P7VEc008Pb6yg@mail.gmail.com>
Date:   Tue, 29 Sep 2020 11:42:43 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     David Laight <David.Laight@...lab.com>,
        Joe Perches <joe@...ches.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Kent Gibson <warthog618@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/9] lib: string_helpers: provide kfree_strarray()

On Tue, Sep 29, 2020 at 10:49 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Tue, Sep 29, 2020 at 08:10:10AM +0000, David Laight wrote:
> > From: Joe Perches
> > > Sent: 28 September 2020 17:07
> > >
> > > On Mon, 2020-09-28 at 18:02 +0200, Bartosz Golaszewski wrote:
> > > > On Mon, Sep 28, 2020 at 5:59 PM Joe Perches <joe@...ches.com> wrote:
> > > > > On Mon, 2020-09-28 at 12:41 +0200, Bartosz Golaszewski wrote:
> > > > > > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > > > > >
> > > > > > There's a common pattern of dynamically allocating an array of char
> > > > > > pointers and then also dynamically allocating each string in this
> > > > > > array. Provide a helper for freeing such a string array with one call.
> > > > >
> > > > > Isn't this also common for things like ring buffers?
> > > > > Why limit this to char *[]?
> > > > >
> > > >
> > > > I don't want to add APIs nobody is using. What do you suggest?
> > >
> > > Change the argument to void** and call it
> > >
> > > void kfree_array(void **array, int count);
> >
> > Does help, void doesn't work that way.
>
> Actually good catch. void * and void ** have a big difference in the implicit
> casting behaviour. I was stumbled over this while playing with some
> experimental stuff locally.
>

I'll keep kfree_strarray() then.

Bart