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ring_buffer: adding EXPORT_SYMBOLs
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I added EXPORT_SYMBOL_GPLs for all functions part of the API
(ring_buffer.h). This is required since oprofile is using the ring
buffer and the compilation as modules would fail otherwise.

Signed-off-by: Robert Richter <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Robert Richter authored and Ingo Molnar committed Dec 12, 2008
1 parent 211117f commit c4f5018
Showing 1 changed file with 34 additions and 0 deletions.
34 changes: 34 additions & 0 deletions kernel/trace/ring_buffer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ void tracing_on(void)
{
ring_buffers_off = 0;
}
EXPORT_SYMBOL_GPL(tracing_on);

/**
* tracing_off - turn off all tracing buffers
Expand All @@ -44,6 +45,7 @@ void tracing_off(void)
{
ring_buffers_off = 1;
}
EXPORT_SYMBOL_GPL(tracing_off);

/* Up this if you want to test the TIME_EXTENTS and normalization */
#define DEBUG_SHIFT 0
Expand All @@ -60,12 +62,14 @@ u64 ring_buffer_time_stamp(int cpu)

return time;
}
EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);

void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
{
/* Just stupid testing the normalize function and deltas */
*ts >>= DEBUG_SHIFT;
}
EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);

#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
#define RB_ALIGNMENT_SHIFT 2
Expand Down Expand Up @@ -115,6 +119,7 @@ unsigned ring_buffer_event_length(struct ring_buffer_event *event)
{
return rb_event_length(event);
}
EXPORT_SYMBOL_GPL(ring_buffer_event_length);

/* inline for ring buffer fast paths */
static inline void *
Expand All @@ -136,6 +141,7 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
{
return rb_event_data(event);
}
EXPORT_SYMBOL_GPL(ring_buffer_event_data);

#define for_each_buffer_cpu(buffer, cpu) \
for_each_cpu_mask(cpu, buffer->cpumask)
Expand Down Expand Up @@ -444,6 +450,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
kfree(buffer);
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_alloc);

/**
* ring_buffer_free - free a ring buffer.
Expand All @@ -459,6 +466,7 @@ ring_buffer_free(struct ring_buffer *buffer)

kfree(buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_free);

static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);

Expand Down Expand Up @@ -620,6 +628,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
mutex_unlock(&buffer->mutex);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(ring_buffer_resize);

static inline int rb_null_event(struct ring_buffer_event *event)
{
Expand Down Expand Up @@ -1220,6 +1229,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
preempt_enable_notrace();
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);

static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
Expand Down Expand Up @@ -1269,6 +1279,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,

return 0;
}
EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);

/**
* ring_buffer_write - write data to the buffer without reserving
Expand Down Expand Up @@ -1334,6 +1345,7 @@ int ring_buffer_write(struct ring_buffer *buffer,

return ret;
}
EXPORT_SYMBOL_GPL(ring_buffer_write);

static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
{
Expand All @@ -1360,6 +1372,7 @@ void ring_buffer_record_disable(struct ring_buffer *buffer)
{
atomic_inc(&buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_disable);

/**
* ring_buffer_record_enable - enable writes to the buffer
Expand All @@ -1372,6 +1385,7 @@ void ring_buffer_record_enable(struct ring_buffer *buffer)
{
atomic_dec(&buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_enable);

/**
* ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
Expand All @@ -1393,6 +1407,7 @@ void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
atomic_inc(&cpu_buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);

/**
* ring_buffer_record_enable_cpu - enable writes to the buffer
Expand All @@ -1412,6 +1427,7 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
atomic_dec(&cpu_buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);

/**
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
Expand All @@ -1428,6 +1444,7 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->entries;
}
EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);

/**
* ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
Expand All @@ -1444,6 +1461,7 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->overrun;
}
EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);

/**
* ring_buffer_entries - get the number of entries in a buffer
Expand All @@ -1466,6 +1484,7 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)

return entries;
}
EXPORT_SYMBOL_GPL(ring_buffer_entries);

/**
* ring_buffer_overrun_cpu - get the number of overruns in buffer
Expand All @@ -1488,6 +1507,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer)

return overruns;
}
EXPORT_SYMBOL_GPL(ring_buffer_overruns);

/**
* ring_buffer_iter_reset - reset an iterator
Expand All @@ -1513,6 +1533,7 @@ void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
else
iter->read_stamp = iter->head_page->time_stamp;
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);

/**
* ring_buffer_iter_empty - check if an iterator has no more to read
Expand All @@ -1527,6 +1548,7 @@ int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
return iter->head_page == cpu_buffer->commit_page &&
iter->head == rb_commit_index(cpu_buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_empty);

static void
rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
Expand Down Expand Up @@ -1797,6 +1819,7 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)

return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_peek);

/**
* ring_buffer_iter_peek - peek at the next event to be read
Expand Down Expand Up @@ -1867,6 +1890,7 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)

return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);

/**
* ring_buffer_consume - return an event and consume it
Expand Down Expand Up @@ -1894,6 +1918,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)

return event;
}
EXPORT_SYMBOL_GPL(ring_buffer_consume);

/**
* ring_buffer_read_start - start a non consuming read of the buffer
Expand Down Expand Up @@ -1934,6 +1959,7 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)

return iter;
}
EXPORT_SYMBOL_GPL(ring_buffer_read_start);

/**
* ring_buffer_finish - finish reading the iterator of the buffer
Expand All @@ -1950,6 +1976,7 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
atomic_dec(&cpu_buffer->record_disabled);
kfree(iter);
}
EXPORT_SYMBOL_GPL(ring_buffer_read_finish);

/**
* ring_buffer_read - read the next item in the ring buffer by the iterator
Expand All @@ -1971,6 +1998,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)

return event;
}
EXPORT_SYMBOL_GPL(ring_buffer_read);

/**
* ring_buffer_size - return the size of the ring buffer (in bytes)
Expand All @@ -1980,6 +2008,7 @@ unsigned long ring_buffer_size(struct ring_buffer *buffer)
{
return BUF_PAGE_SIZE * buffer->pages;
}
EXPORT_SYMBOL_GPL(ring_buffer_size);

static void
rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
Expand Down Expand Up @@ -2022,6 +2051,7 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)

spin_unlock_irqrestore(&cpu_buffer->lock, flags);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);

/**
* ring_buffer_reset - reset a ring buffer
Expand All @@ -2034,6 +2064,7 @@ void ring_buffer_reset(struct ring_buffer *buffer)
for_each_buffer_cpu(buffer, cpu)
ring_buffer_reset_cpu(buffer, cpu);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset);

/**
* rind_buffer_empty - is the ring buffer empty?
Expand All @@ -2052,6 +2083,7 @@ int ring_buffer_empty(struct ring_buffer *buffer)
}
return 1;
}
EXPORT_SYMBOL_GPL(ring_buffer_empty);

/**
* ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
Expand All @@ -2068,6 +2100,7 @@ int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return rb_per_cpu_empty(cpu_buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);

/**
* ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
Expand Down Expand Up @@ -2117,6 +2150,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,

return 0;
}
EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);

static ssize_t
rb_simple_read(struct file *filp, char __user *ubuf,
Expand Down

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