The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3e2a56e6f639492311e0a8533f0a7aed60816308 Mon Sep 17 00:00:00 2001 From: Steven Rostedt rostedt@goodmis.org Date: Fri, 7 Jan 2022 17:56:56 -0500 Subject: [PATCH] tracing: Have syscall trace events use trace_event_buffer_lock_reserve()
Currently, the syscall trace events call trace_buffer_lock_reserve() directly, which means that it misses out on some of the filtering optimizations provided by the helper function trace_event_buffer_lock_reserve(). Have the syscall trace events call that instead, as it was missed when adding the update to use the temp buffer when filtering.
Link: https://lkml.kernel.org/r/20220107225839.823118570@goodmis.org
Cc: stable@vger.kernel.org Cc: Ingo Molnar mingo@kernel.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Tom Zanussi zanussi@kernel.org Reviewed-by: Masami Hiramatsu mhiramat@kernel.org Fixes: 0fc1b09ff1ff4 ("tracing: Use temp buffer when filtering events") Signed-off-by: Steven Rostedt rostedt@goodmis.org
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 8bfcd3b09422..f755bde42fd0 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -323,8 +323,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
trace_ctx = tracing_gen_ctx();
- buffer = tr->array_buffer.buffer; - event = trace_buffer_lock_reserve(buffer, + event = trace_event_buffer_lock_reserve(&buffer, trace_file, sys_data->enter_event->event.type, size, trace_ctx); if (!event) return; @@ -367,8 +366,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
trace_ctx = tracing_gen_ctx();
- buffer = tr->array_buffer.buffer; - event = trace_buffer_lock_reserve(buffer, + event = trace_event_buffer_lock_reserve(&buffer, trace_file, sys_data->exit_event->event.type, sizeof(*entry), trace_ctx); if (!event)