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-rw-r--r--include/linux/cred.h2
-rw-r--r--include/linux/ethtool.h24
-rw-r--r--include/linux/hw_breakpoint.h8
-rw-r--r--include/linux/perf_event.h27
-rw-r--r--include/linux/rcupdate.h45
-rw-r--r--include/linux/rfkill.h2
-rw-r--r--include/linux/rwlock.h20
-rw-r--r--include/linux/sched.h4
-rw-r--r--include/linux/snmp.h2
-rw-r--r--include/linux/spinlock.h13
-rw-r--r--include/net/ip6_route.h18
-rw-r--r--include/net/ip6_tunnel.h1
-rw-r--r--include/net/mac80211.h3
-rw-r--r--include/net/sock.h17
-rw-r--r--include/net/tcp.h2
-rw-r--r--include/net/xfrm.h3
-rw-r--r--include/trace/ftrace.h4
17 files changed, 151 insertions, 44 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h
index 4db09f89b637..52507c3e1387 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -280,7 +280,7 @@ static inline void put_cred(const struct cred *_cred)
* task or by holding tasklist_lock to prevent it from being unlinked.
*/
#define __task_cred(task) \
- ((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock))))
+ ((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_tasklist_lock_is_held())))
/**
* get_task_cred - Get another task's objective credentials
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index cca1c3de140d..b33f316bb92e 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -61,6 +61,13 @@ struct ethtool_drvinfo {
/* For PCI devices, use pci_name(pci_dev). */
char reserved1[32];
char reserved2[12];
+ /*
+ * Some struct members below are filled in
+ * using ops->get_sset_count(). Obtaining
+ * this info from ethtool_drvinfo is now
+ * deprecated; Use ETHTOOL_GSSET_INFO
+ * instead.
+ */
__u32 n_priv_flags; /* number of flags valid in ETHTOOL_GPFLAGS */
__u32 n_stats; /* number of u64's from ETHTOOL_GSTATS */
__u32 testinfo_len;
@@ -253,6 +260,17 @@ struct ethtool_gstrings {
__u8 data[0];
};
+struct ethtool_sset_info {
+ __u32 cmd; /* ETHTOOL_GSSET_INFO */
+ __u32 reserved;
+ __u64 sset_mask; /* input: each bit selects an sset to query */
+ /* output: each bit a returned sset */
+ __u32 data[0]; /* ETH_SS_xxx count, in order, based on bits
+ in sset_mask. One bit implies one
+ __u32, two bits implies two
+ __u32's, etc. */
+};
+
enum ethtool_test_flags {
ETH_TEST_FL_OFFLINE = (1 << 0), /* online / offline */
ETH_TEST_FL_FAILED = (1 << 1), /* test passed / failed */
@@ -606,9 +624,9 @@ struct ethtool_ops {
#define ETHTOOL_SRXCLSRLINS 0x00000032 /* Insert RX classification rule */
#define ETHTOOL_FLASHDEV 0x00000033 /* Flash firmware to device */
#define ETHTOOL_RESET 0x00000034 /* Reset hardware */
-
-#define ETHTOOL_SRXNTUPLE 0x00000035 /* Add an n-tuple filter to device */
-#define ETHTOOL_GRXNTUPLE 0x00000036 /* Get n-tuple filters from device */
+#define ETHTOOL_SRXNTUPLE 0x00000035 /* Add an n-tuple filter to device */
+#define ETHTOOL_GRXNTUPLE 0x00000036 /* Get n-tuple filters from device */
+#define ETHTOOL_GSSET_INFO 0x00000037 /* Get string set info */
/* compatibility with older code */
#define SPARC_ETH_GSET ETHTOOL_GSET
diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 5977b724f7c6..c70d27af03f9 100644
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -66,14 +66,14 @@ register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
perf_overflow_handler_t triggered,
int cpu);
-extern struct perf_event **
+extern struct perf_event * __percpu *
register_wide_hw_breakpoint(struct perf_event_attr *attr,
perf_overflow_handler_t triggered);
extern int register_perf_hw_breakpoint(struct perf_event *bp);
extern int __register_perf_hw_breakpoint(struct perf_event *bp);
extern void unregister_hw_breakpoint(struct perf_event *bp);
-extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
+extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
extern int dbg_reserve_bp_slot(struct perf_event *bp);
extern int dbg_release_bp_slot(struct perf_event *bp);
@@ -100,7 +100,7 @@ static inline struct perf_event *
register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
perf_overflow_handler_t triggered,
int cpu) { return NULL; }
-static inline struct perf_event **
+static inline struct perf_event * __percpu *
register_wide_hw_breakpoint(struct perf_event_attr *attr,
perf_overflow_handler_t triggered) { return NULL; }
static inline int
@@ -109,7 +109,7 @@ static inline int
__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
static inline void
-unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
+unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
static inline int
reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
static inline void release_bp_slot(struct perf_event *bp) { }
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 7b18b4fd5df7..6f8cd7da1a01 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -487,9 +487,8 @@ struct hw_perf_event {
struct hrtimer hrtimer;
};
#ifdef CONFIG_HAVE_HW_BREAKPOINT
- union { /* breakpoint */
- struct arch_hw_breakpoint info;
- };
+ /* breakpoint */
+ struct arch_hw_breakpoint info;
#endif
};
atomic64_t prev_count;
@@ -802,6 +801,13 @@ struct perf_sample_data {
struct perf_raw_record *raw;
};
+static inline
+void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
+{
+ data->addr = addr;
+ data->raw = NULL;
+}
+
extern void perf_output_sample(struct perf_output_handle *handle,
struct perf_event_header *header,
struct perf_sample_data *data,
@@ -858,6 +864,21 @@ extern int sysctl_perf_event_paranoid;
extern int sysctl_perf_event_mlock;
extern int sysctl_perf_event_sample_rate;
+static inline bool perf_paranoid_tracepoint_raw(void)
+{
+ return sysctl_perf_event_paranoid > -1;
+}
+
+static inline bool perf_paranoid_cpu(void)
+{
+ return sysctl_perf_event_paranoid > 0;
+}
+
+static inline bool perf_paranoid_kernel(void)
+{
+ return sysctl_perf_event_paranoid > 1;
+}
+
extern void perf_event_init(void);
extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record, int entry_size);
extern void perf_bp_event(struct perf_event *event, void *data);
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index a005cac5e302..3024050c82a1 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -101,6 +101,11 @@ extern struct lockdep_map rcu_sched_lock_map;
# define rcu_read_release_sched() \
lock_release(&rcu_sched_lock_map, 1, _THIS_IP_)
+static inline int debug_lockdep_rcu_enabled(void)
+{
+ return likely(rcu_scheduler_active && debug_locks);
+}
+
/**
* rcu_read_lock_held - might we be in RCU read-side critical section?
*
@@ -108,12 +113,14 @@ extern struct lockdep_map rcu_sched_lock_map;
* an RCU read-side critical section. In absence of CONFIG_PROVE_LOCKING,
* this assumes we are in an RCU read-side critical section unless it can
* prove otherwise.
+ *
+ * Check rcu_scheduler_active to prevent false positives during boot.
*/
static inline int rcu_read_lock_held(void)
{
- if (debug_locks)
- return lock_is_held(&rcu_lock_map);
- return 1;
+ if (!debug_lockdep_rcu_enabled())
+ return 1;
+ return lock_is_held(&rcu_lock_map);
}
/**
@@ -123,12 +130,14 @@ static inline int rcu_read_lock_held(void)
* an RCU-bh read-side critical section. In absence of CONFIG_PROVE_LOCKING,
* this assumes we are in an RCU-bh read-side critical section unless it can
* prove otherwise.
+ *
+ * Check rcu_scheduler_active to prevent false positives during boot.
*/
static inline int rcu_read_lock_bh_held(void)
{
- if (debug_locks)
- return lock_is_held(&rcu_bh_lock_map);
- return 1;
+ if (!debug_lockdep_rcu_enabled())
+ return 1;
+ return lock_is_held(&rcu_bh_lock_map);
}
/**
@@ -139,15 +148,26 @@ static inline int rcu_read_lock_bh_held(void)
* this assumes we are in an RCU-sched read-side critical section unless it
* can prove otherwise. Note that disabling of preemption (including
* disabling irqs) counts as an RCU-sched read-side critical section.
+ *
+ * Check rcu_scheduler_active to prevent false positives during boot.
*/
+#ifdef CONFIG_PREEMPT
static inline int rcu_read_lock_sched_held(void)
{
int lockdep_opinion = 0;
+ if (!debug_lockdep_rcu_enabled())
+ return 1;
if (debug_locks)
lockdep_opinion = lock_is_held(&rcu_sched_lock_map);
- return lockdep_opinion || preempt_count() != 0 || !rcu_scheduler_active;
+ return lockdep_opinion || preempt_count() != 0;
+}
+#else /* #ifdef CONFIG_PREEMPT */
+static inline int rcu_read_lock_sched_held(void)
+{
+ return 1;
}
+#endif /* #else #ifdef CONFIG_PREEMPT */
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -168,10 +188,17 @@ static inline int rcu_read_lock_bh_held(void)
return 1;
}
+#ifdef CONFIG_PREEMPT
static inline int rcu_read_lock_sched_held(void)
{
- return preempt_count() != 0 || !rcu_scheduler_active;
+ return !rcu_scheduler_active || preempt_count() != 0;
+}
+#else /* #ifdef CONFIG_PREEMPT */
+static inline int rcu_read_lock_sched_held(void)
+{
+ return 1;
}
+#endif /* #else #ifdef CONFIG_PREEMPT */
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -188,7 +215,7 @@ static inline int rcu_read_lock_sched_held(void)
*/
#define rcu_dereference_check(p, c) \
({ \
- if (debug_locks && !(c)) \
+ if (debug_lockdep_rcu_enabled() && !(c)) \
lockdep_rcu_dereference(__FILE__, __LINE__); \
rcu_dereference_raw(p); \
})
diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h
index 97059d08a626..4f82326eb294 100644
--- a/include/linux/rfkill.h
+++ b/include/linux/rfkill.h
@@ -29,7 +29,7 @@
/**
* enum rfkill_type - type of rfkill switch.
*
- * @RFKILL_TYPE_ALL: toggles all switches (userspace only)
+ * @RFKILL_TYPE_ALL: toggles all switches (requests only - not a switch type)
* @RFKILL_TYPE_WLAN: switch is on a 802.11 wireless network device.
* @RFKILL_TYPE_BLUETOOTH: switch is on a bluetooth device.
* @RFKILL_TYPE_UWB: switch is on a ultra wideband device.
diff --git a/include/linux/rwlock.h b/include/linux/rwlock.h
index 71e0b00b6f2c..bc2994ed66e1 100644
--- a/include/linux/rwlock.h
+++ b/include/linux/rwlock.h
@@ -29,25 +29,25 @@ do { \
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
- extern void do_raw_read_lock(rwlock_t *lock);
+ extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
#define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock)
extern int do_raw_read_trylock(rwlock_t *lock);
- extern void do_raw_read_unlock(rwlock_t *lock);
- extern void do_raw_write_lock(rwlock_t *lock);
+ extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
+ extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
#define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock)
extern int do_raw_write_trylock(rwlock_t *lock);
- extern void do_raw_write_unlock(rwlock_t *lock);
+ extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
#else
-# define do_raw_read_lock(rwlock) arch_read_lock(&(rwlock)->raw_lock)
+# define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
# define do_raw_read_lock_flags(lock, flags) \
- arch_read_lock_flags(&(lock)->raw_lock, *(flags))
+ do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
# define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock)
-# define do_raw_read_unlock(rwlock) arch_read_unlock(&(rwlock)->raw_lock)
-# define do_raw_write_lock(rwlock) arch_write_lock(&(rwlock)->raw_lock)
+# define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
+# define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
# define do_raw_write_lock_flags(lock, flags) \
- arch_write_lock_flags(&(lock)->raw_lock, *(flags))
+ do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
# define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock)
-# define do_raw_write_unlock(rwlock) arch_write_unlock(&(rwlock)->raw_lock)
+# define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
#endif
#define read_can_lock(rwlock) arch_read_can_lock(&(rwlock)->raw_lock)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8d70ff802da2..dad7f668ebf7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -258,6 +258,10 @@ extern spinlock_t mmlist_lock;
struct task_struct;
+#ifdef CONFIG_PROVE_RCU
+extern int lockdep_tasklist_lock_is_held(void);
+#endif /* #ifdef CONFIG_PROVE_RCU */
+
extern void sched_init(void);
extern void sched_init_smp(void);
extern asmlinkage void schedule_tail(struct task_struct *prev);
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index e28f5a0182e8..4435d1084755 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -225,6 +225,8 @@ enum
LINUX_MIB_SACKSHIFTED,
LINUX_MIB_SACKMERGED,
LINUX_MIB_SACKSHIFTFALLBACK,
+ LINUX_MIB_TCPBACKLOGDROP,
+ LINUX_MIB_TCPMINTTLDROP, /* RFC 5082 */
__LINUX_MIB_MAX
};
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 86088213334a..89fac6a3f78b 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -128,19 +128,21 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#define raw_spin_unlock_wait(lock) arch_spin_unlock_wait(&(lock)->raw_lock)
#ifdef CONFIG_DEBUG_SPINLOCK
- extern void do_raw_spin_lock(raw_spinlock_t *lock);
+ extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock)
extern int do_raw_spin_trylock(raw_spinlock_t *lock);
- extern void do_raw_spin_unlock(raw_spinlock_t *lock);
+ extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
#else
-static inline void do_raw_spin_lock(raw_spinlock_t *lock)
+static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)
{
+ __acquire(lock);
arch_spin_lock(&lock->raw_lock);
}
static inline void
-do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags)
+do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock)
{
+ __acquire(lock);
arch_spin_lock_flags(&lock->raw_lock, *flags);
}
@@ -149,9 +151,10 @@ static inline int do_raw_spin_trylock(raw_spinlock_t *lock)
return arch_spin_trylock(&(lock)->raw_lock);
}
-static inline void do_raw_spin_unlock(raw_spinlock_t *lock)
+static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
{
arch_spin_unlock(&lock->raw_lock);
+ __release(lock);
}
#endif
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 4a808de7c0f6..68f67836e146 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -37,6 +37,24 @@ struct route_info {
#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
+/*
+ * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
+ * between IPV6_ADDR_PREFERENCES socket option values
+ * IPV6_PREFER_SRC_TMP = 0x1
+ * IPV6_PREFER_SRC_PUBLIC = 0x2
+ * IPV6_PREFER_SRC_COA = 0x4
+ * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
+ */
+static inline int rt6_srcprefs2flags(unsigned int srcprefs)
+{
+ /* No need to bitmask because srcprefs have only 3 bits. */
+ return srcprefs << 3;
+}
+
+static inline unsigned int rt6_flags2srcprefs(int flags)
+{
+ return (flags >> 3) & 7;
+}
extern void ip6_route_input(struct sk_buff *skb);
diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index 83b4e008b16d..fbf9d1cda27b 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -15,7 +15,6 @@
struct ip6_tnl {
struct ip6_tnl *next; /* next tunnel in list */
struct net_device *dev; /* virtual device associated with tunnel */
- int recursion; /* depth of hard_start_xmit recursion */
struct ip6_tnl_parm parms; /* tunnel configuration parameters */
struct flowi fl; /* flowi template for xmit */
struct dst_entry *dst_cache; /* cached dst */
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 80eb7cc42ce9..45d7d44d7cbe 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2426,7 +2426,8 @@ struct rate_control_ops {
struct ieee80211_sta *sta, void *priv_sta);
void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta,
- void *priv_sta, u32 changed);
+ void *priv_sta, u32 changed,
+ enum nl80211_channel_type oper_chan_type);
void (*free_sta)(void *priv, struct ieee80211_sta *sta,
void *priv_sta);
diff --git a/include/net/sock.h b/include/net/sock.h
index 6cb1676e409a..092b0551e77f 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -253,6 +253,8 @@ struct sock {
struct {
struct sk_buff *head;
struct sk_buff *tail;
+ int len;
+ int limit;
} sk_backlog;
wait_queue_head_t *sk_sleep;
struct dst_entry *sk_dst_cache;
@@ -589,8 +591,8 @@ static inline int sk_stream_memory_free(struct sock *sk)
return sk->sk_wmem_queued < sk->sk_sndbuf;
}
-/* The per-socket spinlock must be held here. */
-static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+/* OOB backlog add */
+static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
{
if (!sk->sk_backlog.tail) {
sk->sk_backlog.head = sk->sk_backlog.tail = skb;
@@ -601,6 +603,17 @@ static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb)
skb->next = NULL;
}
+/* The per-socket spinlock must be held here. */
+static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+{
+ if (sk->sk_backlog.len >= max(sk->sk_backlog.limit, sk->sk_rcvbuf << 1))
+ return -ENOBUFS;
+
+ __sk_add_backlog(sk, skb);
+ sk->sk_backlog.len += skb->truesize;
+ return 0;
+}
+
static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
return sk->sk_backlog_rcv(sk, skb);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 56f0aec40ed6..75be5a28815d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -939,7 +939,7 @@ static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
tp->ucopy.memory = 0;
} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
- wake_up_interruptible_poll(sk->sk_sleep,
+ wake_up_interruptible_sync_poll(sk->sk_sleep,
POLLIN | POLLRDNORM | POLLRDBAND);
if (!inet_csk_ack_scheduled(sk))
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index a7df3275b860..d74e080ba6c9 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -275,7 +275,8 @@ struct xfrm_policy_afinfo {
struct dst_entry *dst,
int nfheader_len);
int (*fill_dst)(struct xfrm_dst *xdst,
- struct net_device *dev);
+ struct net_device *dev,
+ struct flowi *fl);
};
extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 0804cd594803..601ad7744247 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -699,9 +699,9 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
* __cpu = smp_processor_id();
*
* if (in_nmi())
- * trace_buf = rcu_dereference(perf_trace_buf_nmi);
+ * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
* else
- * trace_buf = rcu_dereference(perf_trace_buf);
+ * trace_buf = rcu_dereference_sched(perf_trace_buf);
*
* if (!trace_buf)
* goto end;