Daniel Walker wrote:
>
> Description:
> This patch adds the priority list data structure from Inaky Perez-Gonzalez
> to the Preempt Real-Time mutex.
>
> ...
>
> +#define plist_for_each(pos1, pos2, head) \
> + list_for_each_entry(pos1, &((head)->dp_node), dp_node) \
> + list_for_each_entry(pos2, &((pos1)->sp_node), sp_node)
I can't understand how this can work.
The fist list_for_each_entry(->dp_node) will iterate over nodes
with different priorities, ok. But the second one will skip the
first node (which starts new priority group), because list_for_each(head)
does not count head.
To be sure, I wrote simple test:
#include <stdio.h>
#include <limits.h>
#include "list.h"
#include "plist.h"
int main(void)
{
struct plist head, node, *pos1, *pos2;
plist_init(&head, 0);
plist_init(&node, 0);
plist_add(&node, &head);
plist_for_each(pos1, pos2, &head)
printf("Strange ???\n");
return 0;
}
Prints nothing.
My apologies if I'm misunderstanding something.
Oleg.
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