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Date: Wed, 19 Dec 2007 14:25:46 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: acme@...hat.com
Cc: dccp@...r.kernel.org, netdev@...r.kernel.org,
Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH 05/14] [ACKVEC]: Smaller allocation/deallocation routines
This patch removes redundant bits, implementing the same functionality with less code.
The details are:
* The INIT_LIST_HEAD in dccp_ackvec_record_new was redundant, since the list pointers
were later overwritten when the node was added via list_add().
* dccp_ackvec_record_new() was called only in one instance in the entire ackvec code.
* The calls to list_del_init() before calling dccp_ackvec_record_delete() were redundant,
since subsequently the entire element was freed anyway.
* Similarly, since all calls to dccp_ackvec_record_delete() were preceded to a call to
list_del_init(), the WARN_ON test would never evaluate to true.
* Also, since all calls to dccp_ackvec_record_delete() were made from within list_for
each_entry_safe(), the test for avr == NULL was redundant.
* The list_empty() test in ackvec_free was redundant, since the same condition is
embedded in the loop condition of the subsequent list_for_each_entry_safe().
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
net/dccp/ackvec.c | 78 +++++++++++++++++++----------------------------------
1 files changed, 28 insertions(+), 50 deletions(-)
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -24,24 +24,34 @@
static struct kmem_cache *dccp_ackvec_slab;
static struct kmem_cache *dccp_ackvec_record_slab;
-static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
+struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
{
- struct dccp_ackvec_record *avr =
- kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
+ struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
+
+ if (av != NULL) {
+ av->av_buf_head = DCCPAV_MAX_ACKVEC_LEN - 1;
+ av->av_vec_len = 0;
+ memset(av->av_buf_nonce, 0, sizeof(av->av_buf_nonce));
+ INIT_LIST_HEAD(&av->av_records);
+ }
+ return av;
+}
- if (avr != NULL)
- INIT_LIST_HEAD(&avr->avr_node);
+static void dccp_ackvec_purge_records(struct dccp_ackvec *av)
+{
+ struct dccp_ackvec_record *cur, *next;
- return avr;
+ list_for_each_entry_safe(cur, next, &av->av_records, avr_node)
+ kmem_cache_free(dccp_ackvec_record_slab, cur);
+ INIT_LIST_HEAD(&av->av_records);
}
-static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr)
+void dccp_ackvec_free(struct dccp_ackvec *av)
{
- if (unlikely(avr == NULL))
- return;
- /* Check if deleting a linked record */
- WARN_ON(!list_empty(&avr->avr_node));
- kmem_cache_free(dccp_ackvec_record_slab, avr);
+ if (likely(av != NULL)) {
+ dccp_ackvec_purge_records(av);
+ kmem_cache_free(dccp_ackvec_slab, av);
+ }
}
static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
@@ -85,7 +95,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
return -1;
}
- avr = dccp_ackvec_record_new();
+ avr = kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
if (avr == NULL)
return -1;
@@ -147,37 +157,6 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
return 0;
}
-struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
-{
- struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
-
- if (av != NULL) {
- av->av_buf_head = DCCPAV_MAX_ACKVEC_LEN - 1;
- av->av_vec_len = 0;
- memset(av->av_buf_nonce, 0, sizeof(av->av_buf_nonce));
- INIT_LIST_HEAD(&av->av_records);
- }
-
- return av;
-}
-
-void dccp_ackvec_free(struct dccp_ackvec *av)
-{
- if (unlikely(av == NULL))
- return;
-
- if (!list_empty(&av->av_records)) {
- struct dccp_ackvec_record *avr, *next;
-
- list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
- list_del_init(&avr->avr_node);
- dccp_ackvec_record_delete(avr);
- }
- }
-
- kmem_cache_free(dccp_ackvec_slab, av);
-}
-
/*
* If several packets are missing, the HC-Receiver may prefer to enter multiple
* bytes with run length 0, rather than a single byte with a larger run length;
@@ -321,8 +300,8 @@ static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
/* free records */
list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
- list_del_init(&avr->avr_node);
- dccp_ackvec_record_delete(avr);
+ list_del(&avr->avr_node);
+ kmem_cache_free(dccp_ackvec_record_slab, avr);
}
}
@@ -431,10 +410,9 @@ int __init dccp_ackvec_init(void)
if (dccp_ackvec_slab == NULL)
goto out_err;
- dccp_ackvec_record_slab =
- kmem_cache_create("dccp_ackvec_record",
- sizeof(struct dccp_ackvec_record),
- 0, SLAB_HWCACHE_ALIGN, NULL);
+ dccp_ackvec_record_slab = kmem_cache_create("dccp_ackvec_record",
+ sizeof(struct dccp_ackvec_record),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
if (dccp_ackvec_record_slab == NULL)
goto out_destroy_slab;
--
1.5.3.GIT
--
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