From ae81693004fd95f7013e42811944707a92948d9a Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Wed, 10 Jun 2015 13:47:35 +0200 Subject: queue.h: Add QLIST_FIX_HEAD_PTR() If the head of a list has been moved to a different memory location, the le_prev link in the first list entry has to be fixed up. Provide a macro that implements this fixup. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Max Reitz --- include/qemu/queue.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/qemu/queue.h b/include/qemu/queue.h index f781aa2..a8d3cb8 100644 --- a/include/qemu/queue.h +++ b/include/qemu/queue.h @@ -117,6 +117,12 @@ struct { \ } \ } while (/*CONSTCOND*/0) +#define QLIST_FIX_HEAD_PTR(head, field) do { \ + if ((head)->lh_first != NULL) { \ + (head)->lh_first->field.le_prev = &(head)->lh_first; \ + } \ +} while (/*CONSTCOND*/0) + #define QLIST_INSERT_AFTER(listelm, elm, field) do { \ if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \ (listelm)->field.le_next->field.le_prev = \ -- cgit v1.1