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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 <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2015-06-10 13:47:35 +02:00
parent 6ee4ce1ee7
commit ae81693004
1 changed files with 6 additions and 0 deletions
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6
include/qemu/queue.h
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@ -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 = \