laptop-kernel/kernel/trace/trace_snapshot.c, branch master

tracing: Fix ignored return value of resize_buffer_duplicate_size()

2026-10-14T23:03:40Z

When tr->allocated_snapshot is true, resize_buffer_duplicate_size() is called to update the snapshot buffer size. However, its return value was not checked. In case of a failed resize this could lead next snapshot being incomplete. Add resize_buffer_duplicate_size() result check and return error if resize fails. Compile tested only. Found by Linux Verification Center (linuxtesting.org) with SVACE. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260928152634.4354-1-d.kandybka@gmail.com Fixes: 180e4e390978 ("tracing: Add snapshot refcount") Signed-off-by: Dmitry Kandybka Signed-off-by: Steven Rostedt

tracing: Remove duplicate latency_fsnotify() stub

2026-03-31T18:58:39Z

When the SNAPSHOT is defined but FSNOTIFY is not the latency_fsnotify() function is turned into a static inline stub. But this stub was defined in both trace.h and trace_snapshot.c causing a error in build when CONFIG_SNAPSHOT is defined but FSNOTIFY is not. The stub is not needed in trace_snapshot.c as it will be defined in trace.h, remove it from the C file. Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Link: https://patch.msgid.link/20260330205859.24c0aae3@gandalf.local.home Fixes: bade44fe5462 ("tracing: Move snapshot code out of trace.c and into trace_snapshot.c") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202603310604.lGE9LDBK-lkp@intel.com/ Signed-off-by: Steven Rostedt (Google)

tracing: Move snapshot code out of trace.c and into trace_snapshot.c

2026-03-26T14:24:40Z

The trace.c file was a dumping ground for most tracing code. Start organizing it better by moving various functions out into their own files. Move all the snapshot code, including the max trace code into its own trace_snapshot.c file. Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Link: https://patch.msgid.link/20260324140145.36352d6a@gandalf.local.home Signed-off-by: Steven Rostedt (Google)