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authorSteven Rostedt <srostedt@redhat.com>2009-03-03 08:27:49 +0300
committerSteven Rostedt <srostedt@redhat.com>2009-03-04 04:51:24 +0300
commitef7a4a161472b952941bf78855a9cd95703c024e (patch)
tree17145213ece6872d34951a2d33af6670fc2ae453 /include/linux/ring_buffer.h
parent41be4da4e85e58520b934040966a6ae919c66c2d (diff)
downloadlinux-ef7a4a161472b952941bf78855a9cd95703c024e.tar.xz
ring-buffer: fix ring_buffer_read_page
The ring_buffer_read_page was broken if it were to only copy part of the page. This patch fixes that up as well as adds a parameter to allow a length field, in order to only copy part of the buffer page. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'include/linux/ring_buffer.h')
-rw-r--r--include/linux/ring_buffer.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index f5e793d69bd3..79fcbc4b09d6 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -121,6 +121,9 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
u64 ring_buffer_time_stamp(int cpu);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
+size_t ring_buffer_page_len(void *page);
+
+
/*
* The below functions are fine to use outside the tracing facility.
*/
@@ -138,8 +141,8 @@ static inline int tracing_is_on(void) { return 0; }
void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);
void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);
-int ring_buffer_read_page(struct ring_buffer *buffer,
- void **data_page, int cpu, int full);
+int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page,
+ size_t len, int cpu, int full);
enum ring_buffer_flags {
RB_FL_OVERWRITE = 1 << 0,