Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  branch tracer, intel-iommu: fix build with CONFIG_BRANCH_TRACER=y
  branch tracer: Fix for enabling branch profiling makes sparse unusable
  ftrace: Correct a text align for event format output
  Update /debug/tracing/README
  tracing/ftrace: alloc the started cpumask for the trace file
  tracing, x86: remove duplicated #include
  ftrace: Add check of sched_stopped for probe_sched_wakeup
  function-graph: add proper initialization for init task
  tracing/ftrace: fix missing include string.h
  tracing: fix incorrect return type of ns2usecs()
  tracing: remove CALLER_ADDR2 from wakeup tracer
  blktrace: fix pdu_len when tracing packet command requests
  blktrace: small cleanup in blk_msg_write()
  blktrace: NUL-terminate user space messages
  tracing: move scripts/trace/power.pl to scripts/tracing/power.pl

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 61df775..70a10ca 100644 (file)
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -20,7 +20,6 @@
 
 #include <asm/cacheflush.h>
 #include <asm/ftrace.h>
-#include <linux/ftrace.h>
 #include <asm/nops.h>
 #include <asm/nmi.h>
 

diff --git a/block/blk-core.c b/block/blk-core.c
index 43fdedc..07ab754 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -131,6 +131,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
        INIT_HLIST_NODE(&rq->hash);
        RB_CLEAR_NODE(&rq->rb_node);
        rq->cmd = rq->__cmd;
+       rq->cmd_len = BLK_MAX_CDB;
        rq->tag = -1;
        rq->ref_count = 1;
 }

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index cebfdcd..37bcb50 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -76,7 +76,8 @@ struct ftrace_branch_data {
  * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
  * to disable branch tracing on a per file basis.
  */
-#if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING)
+#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
+    && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
 void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 
 #define likely_notrace(x)      __builtin_expect(!!(x), 1)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 015a3d2..da5405d 100644 (file)
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -356,6 +356,9 @@ struct ftrace_graph_ret {
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
+/* for init task */
+#define INIT_FTRACE_GRAPH              .ret_stack = NULL
+
 /*
  * Stack of return addresses for functions
  * of a thread.
@@ -430,10 +433,11 @@ static inline void unpause_graph_tracing(void)
 {
        atomic_dec(&current->tracing_graph_pause);
 }
-#else
+#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
 
 #define __notrace_funcgraph
 #define __irq_entry
+#define INIT_FTRACE_GRAPH
 
 static inline void ftrace_graph_init_task(struct task_struct *t) { }
 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
@@ -445,7 +449,7 @@ static inline int task_curr_ret_stack(struct task_struct *tsk)
 
 static inline void pause_graph_tracing(void) { }
 static inline void unpause_graph_tracing(void) { }
-#endif
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
 #ifdef CONFIG_TRACING
 #include <linux/sched.h>

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index af1de95..dcfb933 100644 (file)
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -5,6 +5,7 @@
 #include <linux/irqflags.h>
 #include <linux/utsname.h>
 #include <linux/lockdep.h>
+#include <linux/ftrace.h>
 #include <linux/ipc.h>
 #include <linux/pid_namespace.h>
 #include <linux/user_namespace.h>
@@ -185,6 +186,7 @@ extern struct cred init_cred;
        INIT_IDS                                                        \
        INIT_TRACE_IRQFLAGS                                             \
        INIT_LOCKDEP                                                    \
+       INIT_FTRACE_GRAPH                                               \
 }
 
 

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 947c5b3..b32ff44 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -327,10 +327,10 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
        char *msg;
        struct blk_trace *bt;
 
-       if (count > BLK_TN_MAX_MSG)
+       if (count >= BLK_TN_MAX_MSG)
                return -EINVAL;
 
-       msg = kmalloc(count, GFP_KERNEL);
+       msg = kmalloc(count + 1, GFP_KERNEL);
        if (msg == NULL)
                return -ENOMEM;
 
@@ -339,6 +339,7 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
                return -EFAULT;
        }
 
+       msg[count] = '\0';
        bt = filp->private_data;
        __trace_note_message(bt, "%s", msg);
        kfree(msg);
@@ -642,7 +643,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
        if (blk_pc_request(rq)) {
                what |= BLK_TC_ACT(BLK_TC_PC);
                __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
-                               sizeof(rq->cmd), rq->cmd);
+                               rq->cmd_len, rq->cmd);
        } else  {
                what |= BLK_TC_ACT(BLK_TC_FS);
                __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a0174a4..9d28476 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -30,6 +30,7 @@
 #include <linux/percpu.h>
 #include <linux/splice.h>
 #include <linux/kdebug.h>
+#include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
@@ -147,8 +148,7 @@ static int __init set_ftrace_dump_on_oops(char *str)
 }
 __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
 
-long
-ns2usecs(cycle_t nsec)
+unsigned long long ns2usecs(cycle_t nsec)
 {
        nsec += 500;
        do_div(nsec, 1000);
@@ -1632,7 +1632,11 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
                return;
 
        cpumask_set_cpu(iter->cpu, iter->started);
-       trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
+
+       /* Don't print started cpu buffer for the first entry of the trace */
+       if (iter->idx > 1)
+               trace_seq_printf(s, "##### CPU %u buffer started ####\n",
+                               iter->cpu);
 }
 
 static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
@@ -1867,6 +1871,11 @@ __tracing_open(struct inode *inode, struct file *file)
        if (current_trace)
                *iter->trace = *current_trace;
 
+       if (!alloc_cpumask_var(&iter->started, GFP_KERNEL))
+               goto fail;
+
+       cpumask_clear(iter->started);
+
        if (current_trace && current_trace->print_max)
                iter->tr = &max_tr;
        else
@@ -1917,6 +1926,7 @@ __tracing_open(struct inode *inode, struct file *file)
                if (iter->buffer_iter[cpu])
                        ring_buffer_read_finish(iter->buffer_iter[cpu]);
        }
+       free_cpumask_var(iter->started);
  fail:
        mutex_unlock(&trace_types_lock);
        kfree(iter->trace);
@@ -1960,6 +1970,7 @@ static int tracing_release(struct inode *inode, struct file *file)
 
        seq_release(inode, file);
        mutex_destroy(&iter->mutex);
+       free_cpumask_var(iter->started);
        kfree(iter->trace);
        kfree(iter);
        return 0;
@@ -2358,9 +2369,9 @@ static const char readme_msg[] =
        "# mkdir /debug\n"
        "# mount -t debugfs nodev /debug\n\n"
        "# cat /debug/tracing/available_tracers\n"
-       "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n"
+       "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
        "# cat /debug/tracing/current_tracer\n"
-       "none\n"
+       "nop\n"
        "# echo sched_switch > /debug/tracing/current_tracer\n"
        "# cat /debug/tracing/current_tracer\n"
        "sched_switch\n"

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index cbc168f..e685ac2 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -602,7 +602,7 @@ extern int trace_selftest_startup_branch(struct tracer *trace,
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
-extern long ns2usecs(cycle_t nsec);
+extern unsigned long long ns2usecs(cycle_t nsec);
 extern int
 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 extern int

diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 4d9952d..07a22c3 100644 (file)
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -40,7 +40,7 @@
 
 #undef TRACE_FIELD_ZERO_CHAR
 #define TRACE_FIELD_ZERO_CHAR(item)                                    \
-       ret = trace_seq_printf(s, "\tfield: char " #item ";\t"          \
+       ret = trace_seq_printf(s, "\tfield:char " #item ";\t"           \
                               "offset:%u;\tsize:0;\n",                 \
                               (unsigned int)offsetof(typeof(field), item)); \
        if (!ret)                                                       \

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index d72b9a6..64b54a5 100644 (file)
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -423,7 +423,7 @@ int trace_print_lat_context(struct trace_iterator *iter)
 
                trace_find_cmdline(entry->pid, comm);
 
-               ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
+               ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
                                       " %ld.%03ldms (+%ld.%03ldms): ", comm,
                                       entry->pid, iter->cpu, entry->flags,
                                       entry->preempt_count, iter->idx,

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index de35f20..9117cea 100644 (file)
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -62,6 +62,9 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
        pc = preempt_count();
        tracing_record_cmdline(current);
 
+       if (sched_stopped)
+               return;
+
        local_irq_save(flags);
        cpu = raw_smp_processor_id();
        data = ctx_trace->data[cpu];

diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 3c5ad6b..5bc00e8 100644 (file)
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -154,7 +154,7 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
        if (unlikely(!tracer_enabled || next != wakeup_task))
                goto out_unlock;
 
-       trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+       trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
        tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
 
        /*
@@ -257,6 +257,12 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
        data = wakeup_trace->data[wakeup_cpu];
        data->preempt_timestamp = ftrace_now(cpu);
        tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc);
+
+       /*
+        * We must be careful in using CALLER_ADDR2. But since wake_up
+        * is not called by an assembly function  (where as schedule is)
+        * it should be safe to use it here.
+        */
        trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
 
 out_locked:

diff --git a/scripts/trace/power.pl b/scripts/tracing/power.pl
similarity index 100%
rename from scripts/trace/power.pl
rename to scripts/tracing/power.pl