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| author | Jens Axboe <axboe@kernel.dk> | 2012-12-19 20:37:10 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-12-19 20:37:10 +0100 |
| commit | b6c46cfa312639a5416959258e6a81bea2fdaf8a (patch) | |
| tree | b087a7aa789e33465cceb70d8f8bc68b6f1ea919 /include | |
| parent | 12c2bdb232168511c8dd54d6626549391a228918 (diff) | |
| parent | d62f691858252333ff1ddb920e6774d9020734aa (diff) | |
| download | linux-stable-b6c46cfa312639a5416959258e6a81bea2fdaf8a.tar.gz linux-stable-b6c46cfa312639a5416959258e6a81bea2fdaf8a.tar.bz2 linux-stable-b6c46cfa312639a5416959258e6a81bea2fdaf8a.zip | |
Merge branch 'stable/for-jens-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus
Konrad writes:
Please git pull the following branch:
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-jens-3.8
which has a bug-fix to the xen-blkfront and xen-blkback driver
when using the persistent mode. An issue was discovered where LVM
disks could not be read correctly and this fixes it. There
is also a change in llist.h which has been blessed by akpm.
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/llist.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/llist.h b/include/linux/llist.h index a5199f6d0e82..d0ab98f73d38 100644 --- a/include/linux/llist.h +++ b/include/linux/llist.h @@ -125,6 +125,31 @@ static inline void init_llist_head(struct llist_head *list) (pos) = llist_entry((pos)->member.next, typeof(*(pos)), member)) /** + * llist_for_each_entry_safe - iterate safely against remove over some entries + * of lock-less list of given type. + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as a temporary storage. + * @node: the fist entry of deleted list entries. + * @member: the name of the llist_node with the struct. + * + * In general, some entries of the lock-less list can be traversed + * safely only after being removed from list, so start with an entry + * instead of list head. This variant allows removal of entries + * as we iterate. + * + * If being used on entries deleted from lock-less list directly, the + * traverse order is from the newest to the oldest added entry. If + * you want to traverse from the oldest to the newest, you must + * reverse the order by yourself before traversing. + */ +#define llist_for_each_entry_safe(pos, n, node, member) \ + for ((pos) = llist_entry((node), typeof(*(pos)), member), \ + (n) = (pos)->member.next; \ + &(pos)->member != NULL; \ + (pos) = llist_entry(n, typeof(*(pos)), member), \ + (n) = (&(pos)->member != NULL) ? (pos)->member.next : NULL) + +/** * llist_empty - tests whether a lock-less list is empty * @head: the list to test * |