Please consider pulling from:
bk://kernel.bkbits.net/acme/hlist-2.5
I discussed this with Andi and he gave me an ACK to submit, please
let me know if you don't like anything and I'll be happy to fix it. The
hlist_for_each_entry is being used in my current work of converting net/
to use hlist_{head,node}.
Best Regards,
- Arnaldo
You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.
===================================================================
ChangeSet@1.1320, 2003-06-07 14:22:10-03:00, acme@conectiva.com.br
o list.h: improve hlist
This changeset:
1. Implements hlist_add_after
2. uses prefetch in hlist_for_each, using a trick that ends up being
equivalent to having the prefetch instruction in the first block
of the hlist_for_each for block, the compiler optimizes the second
"test" away, as its result is constant
3. implements hlist_for_each_entry and hlist_for_each_entry safe,
using a struct hlist_node as iterator to avoid the extra branches a
similar implementation to list_for_each_entry would have if used
a typed iterator, but while avoiding having to have the explicit
hlist_entry as in hlist_for_each.
4. Converts the hlist_for_each users that had explicit prefetches, i.e.
removed the explicit prefetch
5. fix a harmless list_entry use in a hlist_for_each in inode.c
fs/dcache.c | 3 ---
fs/inode.c | 4 +---
include/linux/list.h | 35 ++++++++++++++++++++++++++++++++++-
3 files changed, 35 insertions(+), 7 deletions(-)
diff -Nru a/fs/dcache.c b/fs/dcache.c
--- a/fs/dcache.c Sat Jun 7 15:39:03 2003
+++ b/fs/dcache.c Sat Jun 7 15:39:03 2003
@@ -983,8 +983,6 @@
struct dentry *dentry;
unsigned long move_count;
struct qstr * qstr;
-
- prefetch(node->next);
smp_read_barrier_depends();
dentry = hlist_entry(node, struct dentry, d_hash);
@@ -1072,7 +1070,6 @@
spin_lock(&dcache_lock);
base = d_hash(dparent, dentry->d_name.hash);
hlist_for_each(lhp,base) {
- prefetch(lhp->next);
/* read_barrier_depends() not required for d_hash list
* as it is parsed under dcache_lock
*/
diff -Nru a/fs/inode.c b/fs/inode.c
--- a/fs/inode.c Sat Jun 7 15:39:03 2003
+++ b/fs/inode.c Sat Jun 7 15:39:03 2003
@@ -484,7 +484,6 @@
repeat:
hlist_for_each (node, head) {
- prefetch(node->next);
inode = hlist_entry(node, struct inode, i_hash);
if (inode->i_sb != sb)
continue;
@@ -510,8 +509,7 @@
repeat:
hlist_for_each (node, head) {
- prefetch(node->next);
- inode = list_entry(node, struct inode, i_hash);
+ inode = hlist_entry(node, struct inode, i_hash);
if (inode->i_ino != ino)
continue;
if (inode->i_sb != sb)
diff -Nru a/include/linux/list.h b/include/linux/list.h
--- a/include/linux/list.h Sat Jun 7 15:39:03 2003
+++ b/include/linux/list.h Sat Jun 7 15:39:03 2003
@@ -443,17 +443,50 @@
*(n->pprev) = n;
}
+static __inline__ void hlist_add_after(struct hlist_node *n,
+ struct hlist_node *next)
+{
+ next->next = n->next;
+ *(next->pprev) = n;
+ n->next = next;
+}
+
#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
/* Cannot easily do prefetch unfortunately */
#define hlist_for_each(pos, head) \
- for (pos = (head)->first; pos; \
+ for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
pos = pos->next)
#define hlist_for_each_safe(pos, n, head) \
for (pos = (head)->first; n = pos ? pos->next : 0, pos; \
pos = n)
+/**
+ * hlist_for_each_entry - iterate over list of given type
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry(tpos, pos, head, member) \
+ for (pos = (head)->first; \
+ pos && ({ prefetch(pos->next); 1;}) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = pos->next)
+/**
+ * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @n: another &struct hlist_node to use as temporary storage
+ * @head: the head for your list.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \
+ for (pos = (head)->first; \
+ pos && ({ n = pos->next; 1; }) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = n)
#else
#warning "don't include kernel headers in userspace"
#endif /* __KERNEL__ */
===================================================================
This BitKeeper patch contains the following changesets:
1.1320
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