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authorMark Rutland <mark.rutland@arm.com>2017-10-23 14:07:17 -0700
committerIngo Molnar <mingo@kernel.org>2017-10-25 11:00:59 +0200
commit14cd5d4a0125f643350e7fa12f5384f1fc2d3e9d (patch)
tree32a4e24f0a0b2ed2aaa5a50be2d25a1e56f21726
parent24fbd6e04e4e4793ec9dd9c2e007b0b38d2ec3ab (diff)
locking/atomics, net/netlink/netfilter: Convert ACCESS_ONCE() to READ_ONCE()/WRITE_ONCE()
For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't currently harmful. However, for some features it is necessary to instrument reads and writes separately, which is not possible with ACCESS_ONCE(). This distinction is critical to correct operation. It's possible to transform the bulk of kernel code using the Coccinelle script below. However, this doesn't handle comments, leaving references to ACCESS_ONCE() instances which have been removed. As a preparatory step, this patch converts netlink and netfilter code and comments to use {READ,WRITE}_ONCE() consistently. ---- virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Florian Westphal <fw@strlen.de> Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: mpe@ellerman.id.au Cc: shuah@kernel.org Cc: snitzer@redhat.com Cc: thor.thayer@linux.intel.com Cc: tj@kernel.org Cc: viro@zeniv.linux.org.uk Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1508792849-3115-7-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--include/linux/genetlink.h2
-rw-r--r--include/linux/netfilter/nfnetlink.h2
-rw-r--r--include/linux/rtnetlink.h2
-rw-r--r--include/net/netfilter/nf_tables.h4
-rw-r--r--net/netfilter/ipvs/ip_vs_sync.c2
-rw-r--r--net/netfilter/nfnetlink_queue.c4
6 files changed, 8 insertions, 8 deletions
diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h
index a4c61cbce777..0e694cf62414 100644
--- a/include/linux/genetlink.h
+++ b/include/linux/genetlink.h
@@ -30,7 +30,7 @@ extern wait_queue_head_t genl_sk_destructing_waitq;
* @p: The pointer to read, prior to dereferencing
*
* Return the value of the specified RCU-protected pointer, but omit
- * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * both the smp_read_barrier_depends() and the READ_ONCE(), because
* caller holds genl mutex.
*/
#define genl_dereference(p) \
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 41d04e9d088a..0f47a4aa7fc4 100644
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -66,7 +66,7 @@ static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
* @ss: The nfnetlink subsystem ID
*
* Return the value of the specified RCU-protected pointer, but omit
- * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * both the smp_read_barrier_depends() and the READ_ONCE(), because
* caller holds the NFNL subsystem mutex.
*/
#define nfnl_dereference(p, ss) \
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index dea59c8eec54..765f7b915475 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -67,7 +67,7 @@ static inline bool lockdep_rtnl_is_held(void)
* @p: The pointer to read, prior to dereferencing
*
* Return the value of the specified RCU-protected pointer, but omit
- * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * both the smp_read_barrier_depends() and the READ_ONCE(), because
* caller holds RTNL.
*/
#define rtnl_dereference(p) \
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 0f5b12a4ad09..5c68e279eaea 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1164,8 +1164,8 @@ static inline u8 nft_genmask_next(const struct net *net)
static inline u8 nft_genmask_cur(const struct net *net)
{
- /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
- return 1 << ACCESS_ONCE(net->nft.gencursor);
+ /* Use READ_ONCE() to prevent refetching the value for atomicity */
+ return 1 << READ_ONCE(net->nft.gencursor);
}
#define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 0e5b64a75da0..1cfffd42d1e2 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -457,7 +457,7 @@ static inline bool in_persistence(struct ip_vs_conn *cp)
static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
struct ip_vs_conn *cp, int pkts)
{
- unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
+ unsigned long orig = READ_ONCE(cp->sync_endtime);
unsigned long now = jiffies;
unsigned long n = (now + cp->timeout) & ~3UL;
unsigned int sync_refresh_period;
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index c9796629858f..a16356cacec3 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -401,7 +401,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
outdev = entry->state.out;
- switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
+ switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) {
case NFQNL_COPY_META:
case NFQNL_COPY_NONE:
break;
@@ -412,7 +412,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
skb_checksum_help(entskb))
return NULL;
- data_len = ACCESS_ONCE(queue->copy_range);
+ data_len = READ_ONCE(queue->copy_range);
if (data_len > entskb->len)
data_len = entskb->len;