The patch titled
llist: return whether list is empty before adding in llist_add
has been added to the -mm tree. Its filename is
llist-return-whether-list-is-empty-before-adding-in-llist_add.patch
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------------------------------------------------------
Subject: llist: return whether list is empty before adding in llist_add
From: Huang Ying <ying.huang@xxxxxxxxx>
This is needed by irq_work. And because list_add_xxx functions are
inline, this can be optimized out if not needed by callers.
Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/llist.h | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN include/linux/llist.h~llist-return-whether-list-is-empty-before-adding-in-llist_add include/linux/llist.h
--- a/include/linux/llist.h~llist-return-whether-list-is-empty-before-adding-in-llist_add
+++ a/include/linux/llist.h
@@ -148,8 +148,10 @@ static inline bool llist_empty(const str
* llist_add - add a new entry
* @new: new entry to be added
* @head: the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
*/
-static inline void llist_add(struct llist_node *new, struct llist_head *head)
+static inline bool llist_add(struct llist_node *new, struct llist_head *head)
{
struct llist_node *entry, *old_entry;
@@ -164,6 +166,8 @@ static inline void llist_add(struct llis
break;
cpu_relax();
}
+
+ return old_entry == NULL;
}
/**
@@ -171,8 +175,10 @@ static inline void llist_add(struct llis
* @new_first: first entry in batch to be added
* @new_last: last entry in batch to be added
* @head: the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
*/
-static inline void llist_add_batch(struct llist_node *new_first,
+static inline bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head)
{
@@ -189,6 +195,8 @@ static inline void llist_add_batch(struc
break;
cpu_relax();
}
+
+ return old_entry == NULL;
}
/**
_
Patches currently in -mm which might be from ying.huang@xxxxxxxxx are
llist-make-all-llist-functions-inline.patch
llist-define-macro-to-check-nmi-safe-cmpxchg.patch
llist-move-cpu_relax-after-cmpxchg.patch
llist-return-whether-list-is-empty-before-adding-in-llist_add.patch
llist-return-whether-list-is-empty-before-adding-in-llist_add-fix.patch
kernel-irq_workc-use-llist.patch
net-rds-replace-xlist-in-net-rds-xlisth-with-llist.patch
lib-bitmapc-quiet-sparse-noise-about-address-space.patch
lib-bitmapc-quiet-sparse-noise-about-address-space-fix.patch
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