Patch "tracing: Show size of requested perf buffer" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    tracing: Show size of requested perf buffer

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tracing-show-size-of-requested-perf-buffer.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From a90afe8d020da9298c98fddb19b7a6372e2feb45 Mon Sep 17 00:00:00 2001
From: "Robin H. Johnson" <robbat2@xxxxxxxxxx>
Date: Mon, 30 Aug 2021 21:37:22 -0700
Subject: tracing: Show size of requested perf buffer

From: Robin H. Johnson <robbat2@xxxxxxxxxx>

commit a90afe8d020da9298c98fddb19b7a6372e2feb45 upstream.

If the perf buffer isn't large enough, provide a hint about how large it
needs to be for whatever is running.

Link: https://lkml.kernel.org/r/20210831043723.13481-1-robbat2@xxxxxxxxxx

Signed-off-by: Robin H. Johnson <robbat2@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxx>
---
 kernel/trace/trace_event_perf.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -395,7 +395,8 @@ void *perf_trace_buf_alloc(int size, str
 	BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
 
 	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
-		      "perf buffer not large enough"))
+		      "perf buffer not large enough, wanted %d, have %d",
+		      size, PERF_MAX_TRACE_SIZE))
 		return NULL;
 
 	*rctxp = rctx = perf_swevent_get_recursion_context();


Patches currently in stable-queue which might be from robbat2@xxxxxxxxxx are

queue-5.4/tracing-increase-perf_max_trace_size-to-handle-sentinel1-and-docker-together.patch
queue-5.4/tracing-show-size-of-requested-perf-buffer.patch




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