Fix reversed mask usage of subbuffer offset

[lttng-ust.git] / libringbuffer / backend.h

diff --git a/libringbuffer/backend.h b/libringbuffer/backend.h
index d93f6d1fd09ef2da267ce0b0a7307202a3f9427c..83e07e426b3de3458a995bcfa953e0e33ee9d1fb 100644 (file)
--- a/libringbuffer/backend.h
+++ b/libringbuffer/backend.h
@@ -88,7 +88,7 @@ void lib_ring_buffer_write(const struct lib_ring_buffer_config *config,
         */
        CHAN_WARN_ON(chanb, offset >= chanb->buf_size);
        lib_ring_buffer_do_copy(config,
-                               shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & ~(chanb->subbuf_size - 1)),
+                               shmp_index(handle, shmp(handle, rpages->shmp)->p, offset & (chanb->subbuf_size - 1)),
                                src, len);
        ctx->buf_offset += len;
 }