linux-kernel - Re: [PATCH] [ACPI] Change structure initialisation to C99 style

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Date:	Thu, 16 Jun 2016 10:39:43 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>
Cc:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	linux-ia64@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>,
	Michael Leibowitz <michael.leibowitz@...el.com>
Subject: Re: [PATCH] [ACPI] Change structure initialisation to C99 style

On Tue, Jun 14, 2016 at 1:42 AM, Amitoj Kaur Chawla
<amitoj1606@...il.com> wrote:
> Replace the in order struct initialisation style with explicit field
> style.
>
> The Coccinelle semantic patch used to make this change is as follows:
>
> @decl@
> identifier i1,fld;
> type T;
> field list[n] fs;
> @@
>
> struct i1 {
>  fs
>  T fld;
>  ...};
>
> @@
> identifier decl.i1,i2,decl.fld;
> expression e;
> position bad.p, bad.fix;
> @@
>
> struct i1 i2@p = { ...,
> + .fld = e
> - e@fix
>  ,...};
>
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
> ---
>  arch/ia64/kernel/acpi-ext.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/ia64/kernel/acpi-ext.c b/arch/ia64/kernel/acpi-ext.c
> index bd09bf7..31e331a 100644
> --- a/arch/ia64/kernel/acpi-ext.c
> +++ b/arch/ia64/kernel/acpi-ext.c
> @@ -80,7 +80,7 @@ static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
>
>  static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
>  {
> -       struct csr_space space = { 0, 0 };
> +       struct csr_space space = { .base = 0, .length = 0 };

Since these are all initialized to zero, won't "= { };" be easier here?

-Kees

>
>         acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
>         if (!space.length)
> --
> 1.9.1
>



-- 
Kees Cook
Chrome OS & Brillo Security