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Date: Tue, 21 Mar 2017 11:53:34 +0900 From: Byungchul Park <byungchul.park@....com> To: <peterz@...radead.org>, <mingo@...nel.org> CC: <peterz@...radead.org>, <mingo@...nel.org>, <neilb@...e.de>, <nab@...ux-iscsi.org>, <viro@...iv.linux.org.uk>, <oleg@...hat.com>, <shli@...nel.org>, <linux-kernel@...r.kernel.org>, "Huang, Ying" <ying.huang@...el.com>, <kernel-team@....com> Subject: Re: [PATCH v3 1/9] llist: Provide a safe version for llist_for_each On Tue, Feb 14, 2017 at 03:45:44PM +0800, Huang, Ying wrote: > Byungchul Park <byungchul.park@....com> writes: > > > Sometimes we have to dereference next field of llist node before entering > > loop becasue the node might be deleted or the next field might be > > modified within the loop. So this adds the safe version of llist_for_each, > > that is, llist_for_each_safe. > > > > Signed-off-by: Byungchul Park <byungchul.park@....com> > > Reviewed-by: "Huang, Ying" <ying.huang@...el.com> Hello, Could you check this out? > > Best Regards, > Huang, Ying > > > --- > > include/linux/llist.h | 19 +++++++++++++++++++ > > 1 file changed, 19 insertions(+) > > > > diff --git a/include/linux/llist.h b/include/linux/llist.h > > index fd4ca0b..b90c9f2 100644 > > --- a/include/linux/llist.h > > +++ b/include/linux/llist.h > > @@ -105,6 +105,25 @@ static inline void init_llist_head(struct llist_head *list) > > for ((pos) = (node); pos; (pos) = (pos)->next) > > > > /** > > + * llist_for_each_safe - iterate over some deleted entries of a lock-less list > > + * safe against removal of list entry > > + * @pos: the &struct llist_node to use as a loop cursor > > + * @n: another &struct llist_node to use as temporary storage > > + * @node: the first entry of deleted list entries > > + * > > + * In general, some entries of the lock-less list can be traversed > > + * safely only after being deleted from list, so start with an entry > > + * instead of list head. > > + * > > + * 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_safe(pos, n, node) \ > > + for ((pos) = (node); (pos) && ((n) = (pos)->next, true); (pos) = (n)) > > + > > +/** > > * llist_for_each_entry - iterate over some deleted entries of lock-less list of given type > > * @pos: the type * to use as a loop cursor. > > * @node: the fist entry of deleted list entries.
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