On Tue, 01 Apr 2025 16:25:53 -0400 Steven Rostedt <[email protected]> wrote:
> > static void > @@ -7319,7 +7319,8 @@ int ring_buffer_map_get_reader(struct trace_buffer > *buffer, int cpu) > > out: > /* Some archs do not have data cache coherency between kernel and > user-space */ > - flush_dcache_folio(virt_to_folio(cpu_buffer->reader_page->page)); > + flush_kernel_vmap_range(cpu_buffer->reader_page->page, > + buffer->subbuf_size + BUF_PAGE_HDR_SIZE); > > rb_update_meta_page(cpu_buffer); > This patch actually fixes a bug (I need to update the change log). The previous code only flushed a page. But if the sub-buffer size was 2 or more pages, it would not flush the rest of the sub-buffer. -- Steve
