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author | Ingo Molnar <mingo@elte.hu> | 2011-01-05 13:14:42 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-01-05 13:14:46 (GMT) |
commit | 27066fd484a32c80630136aa2b91c980f3198f9d (patch) | |
tree | 78ddabdedbfd7525d13ecd62a745525843f1d0e8 /kernel/trace | |
parent | 101e5f77bf35679809586e250b6c62193d2ed179 (diff) | |
parent | 3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5 (diff) | |
download | linux-27066fd484a32c80630136aa2b91c980f3198f9d.tar.xz |
Merge commit 'v2.6.37' into sched/core
Merge reason: Merge the final .37 tree.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r-- | kernel/trace/ring_buffer.c | 9 | ||||
-rw-r--r-- | kernel/trace/trace.c | 10 |
2 files changed, 17 insertions, 2 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 9ed509a..bd1c35a 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -3853,6 +3853,13 @@ int ring_buffer_read_page(struct ring_buffer *buffer, /* Need to copy one event at a time */ do { + /* We need the size of one event, because + * rb_advance_reader only advances by one event, + * whereas rb_event_ts_length may include the size of + * one or two events. + * We have already ensured there's enough space if this + * is a time extend. */ + size = rb_event_length(event); memcpy(bpage->data + pos, rpage->data + rpos, size); len -= size; @@ -3867,7 +3874,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer, event = rb_reader_event(cpu_buffer); /* Always keep the time extend and data together */ size = rb_event_ts_length(event); - } while (len > size); + } while (len >= size); /* update bpage */ local_set(&bpage->commit, pos); diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index c38061227..f8cf959 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2338,11 +2338,19 @@ tracing_write_stub(struct file *filp, const char __user *ubuf, return count; } +static loff_t tracing_seek(struct file *file, loff_t offset, int origin) +{ + if (file->f_mode & FMODE_READ) + return seq_lseek(file, offset, origin); + else + return 0; +} + static const struct file_operations tracing_fops = { .open = tracing_open, .read = seq_read, .write = tracing_write_stub, - .llseek = seq_lseek, + .llseek = tracing_seek, .release = tracing_release, }; |