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Re: [XEN PATCH v2 3/7] xen/list: address violations of MISRA C Rule 20.7
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 11 Mar 2024 08:48:55 +0100
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, bertrand.marquis@xxxxxxx, julien@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 11 Mar 2024 07:49:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.03.2024 12:21, Nicola Vetrini wrote:
> --- a/xen/include/xen/list.h
> +++ b/xen/include/xen/list.h
> @@ -479,9 +479,9 @@ static inline void list_splice_init(struct list_head
> *list,
> * @n: another &struct list_head to use as temporary storage
> * @head: the head for your list.
> */
> -#define list_for_each_backwards_safe(pos, n, head) \
> - for ( pos = (head)->prev, n = pos->prev; pos != (head); \
> - pos = n, n = pos->prev )
> +#define list_for_each_backwards_safe(pos, n, head) \
> + for ( (pos) = (head)->prev, n = (pos)->prev; (pos) != (head); \
> + (pos) = n, n = (pos)->prev )
I think this is worse than before and incomplete: At least the rhs use of n
also needs parenthesizing. Plus if pos is parenthesized even in lhs
instances, imo n ought to be, too.
Jan
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