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percpu: add __percpu sparse annotations to net

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Add __percpu sparse annotations to net.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

The macro and type tricks around snmp stats make things a bit
interesting.  DEFINE/DECLARE_SNMP_STAT() macros mark the target field
as __percpu and SNMP_UPD_PO_STATS() macro is updated accordingly.  All
snmp_mib_*() users which used to cast the argument to (void **) are
updated to cast it to (void __percpu **).

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Vlad Yasevich <vladislav.yasevich@hp.com>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tejun Heo
2010-02-16 15:20:26 +00:00
committed by David S. Miller
parent 2bb4646fce
commit 7d720c3e4f
22 changed files with 127 additions and 114 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/net/ip.h
+3 -3
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@@ -174,9 +174,9 @@ extern struct ipv4_config ipv4_config;
#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
extern unsigned long snmp_fold_field(void *mib[], int offt);
extern int snmp_mib_init(void *ptr[2], size_t mibsize);
extern void snmp_mib_free(void *ptr[2]);
extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize);
extern void snmp_mib_free(void __percpu *ptr[2]);
extern struct local_ports {
seqlock_t lock;
include/net/ipcomp.h
+1 -1
View File
@@ -9,7 +9,7 @@ struct crypto_comp;
struct ipcomp_data {
u16 threshold;
struct crypto_comp **tfms;
struct crypto_comp * __percpu *tfms;
};
struct ip_comp_hdr;
include/net/neighbour.h
+1 -1
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@@ -164,7 +164,7 @@ struct neigh_table {
rwlock_t lock;
unsigned long last_rand;
struct kmem_cache *kmem_cachep;
struct neigh_statistics *stats;
struct neigh_statistics __percpu *stats;
struct neighbour **hash_buckets;
unsigned int hash_mask;
__u32 hash_rnd;
include/net/netns/conntrack.h
+1 -1
View File
@@ -17,7 +17,7 @@ struct netns_ct {
struct hlist_head *expect_hash;
struct hlist_nulls_head unconfirmed;
struct hlist_nulls_head dying;
struct ip_conntrack_stat *stat;
struct ip_conntrack_stat __percpu *stat;
int sysctl_events;
unsigned int sysctl_events_retry_timeout;
int sysctl_acct;
include/net/netns/core.h
+1 -1
View File
@@ -10,7 +10,7 @@ struct netns_core {
int sysctl_somaxconn;
struct prot_inuse *inuse;
struct prot_inuse __percpu *inuse;
};
#endif
include/net/route.h
+1 -1
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@@ -101,7 +101,7 @@ struct rt_cache_stat {
unsigned int out_hlist_search;
};
extern struct ip_rt_acct *ip_rt_acct;
extern struct ip_rt_acct __percpu *ip_rt_acct;
struct in_device;
extern int ip_rt_init(void);
include/net/snmp.h
+8 -4
View File
@@ -129,9 +129,9 @@ struct linux_xfrm_mib {
* nonlocked_atomic_inc() primitives -AK
*/
#define DEFINE_SNMP_STAT(type, name) \
__typeof__(type) *name[2]
__typeof__(type) __percpu *name[2]
#define DECLARE_SNMP_STAT(type, name) \
extern __typeof__(type) *name[2]
extern __typeof__(type) __percpu *name[2]
#define SNMP_STAT_BHPTR(name) (name[0])
#define SNMP_STAT_USRPTR(name) (name[1])
@@ -148,9 +148,13 @@ struct linux_xfrm_mib {
__this_cpu_add(mib[0]->mibs[field], addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) \
this_cpu_add(mib[1]->mibs[field], addend)
/*
* Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
* to make @ptr a non-percpu pointer.
*/
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
do { \
__typeof__(mib[0]) ptr; \
__typeof__(*mib[0]) *ptr; \
preempt_disable(); \
ptr = this_cpu_ptr((mib)[!in_softirq()]); \
ptr->mibs[basefield##PKTS]++; \
@@ -159,7 +163,7 @@ struct linux_xfrm_mib {
} while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
do { \
__typeof__(mib[0]) ptr = \
__typeof__(*mib[0]) *ptr = \
__this_cpu_ptr((mib)[!in_softirq()]); \
ptr->mibs[basefield##PKTS]++; \
ptr->mibs[basefield##OCTETS] += addend;\
include/net/tcp.h
+1 -1
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@@ -1189,7 +1189,7 @@ extern int tcp_v4_md5_do_del(struct sock *sk,
#define tcp_twsk_md5_key(twsk) NULL
#endif
extern struct tcp_md5sig_pool **tcp_alloc_md5sig_pool(struct sock *);
extern struct tcp_md5sig_pool * __percpu *tcp_alloc_md5sig_pool(struct sock *);
extern void tcp_free_md5sig_pool(void);
extern struct tcp_md5sig_pool *__tcp_get_md5sig_pool(int cpu);