oprofile: fix cpu buffer size

The unit of oprofile_cpu_buffer_size is in samples, but was allocated
in bytes. This led to the allocation of too small cpu buffers. This
patch recalculates the buffer size in bytes taking also the
ring_buffer_event header size into account.

Reported-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index f0e99d4c066b9acfeada76a623258d5fda744b5d..242257b19441fb31bc95b0ba10324ffc2ec8df35 100644 (file)
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -78,16 +78,20 @@ void free_cpu_buffers(void)
        op_ring_buffer_write = NULL;
 }
 
+#define RB_EVENT_HDR_SIZE 4
+
 int alloc_cpu_buffers(void)
 {
        int i;
 
        unsigned long buffer_size = oprofile_cpu_buffer_size;
+       unsigned long byte_size = buffer_size * (sizeof(struct op_sample) +
+                                                RB_EVENT_HDR_SIZE);
 
-       op_ring_buffer_read = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
+       op_ring_buffer_read = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
        if (!op_ring_buffer_read)
                goto fail;
-       op_ring_buffer_write = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
+       op_ring_buffer_write = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
        if (!op_ring_buffer_write)
                goto fail;