This is a note to let you know that I've just added the patch titled
tracing: Fix poll() and select() do not work on per_cpu trace_pipe and trace_pipe_raw
to the 5.15-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-fix-poll-and-select-do-not-work-on-per_cpu-trace_pipe-and-trace_pipe_raw.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3e46d910d8acf94e5360126593b68bf4fee4c4a1 Mon Sep 17 00:00:00 2001
From: Shiju Jose <shiju.jose@xxxxxxxxxx>
Date: Thu, 2 Feb 2023 18:23:09 +0000
Subject: tracing: Fix poll() and select() do not work on per_cpu trace_pipe and trace_pipe_raw
From: Shiju Jose <shiju.jose@xxxxxxxxxx>
commit 3e46d910d8acf94e5360126593b68bf4fee4c4a1 upstream.
poll() and select() on per_cpu trace_pipe and trace_pipe_raw do not work
since kernel 6.1-rc6. This issue is seen after the commit
42fb0a1e84ff525ebe560e2baf9451ab69127e2b ("tracing/ring-buffer: Have
polling block on watermark").
This issue is firstly detected and reported, when testing the CXL error
events in the rasdaemon and also erified using the test application for poll()
and select().
This issue occurs for the per_cpu case, when calling the ring_buffer_poll_wait(),
in kernel/trace/ring_buffer.c, with the buffer_percent > 0 and then wait until the
percentage of pages are available. The default value set for the buffer_percent is 50
in the kernel/trace/trace.c.
As a fix, allow userspace application could set buffer_percent as 0 through
the buffer_percent_fops, so that the task will wake up as soon as data is added
to any of the specific cpu buffer.
Link: https://lore.kernel.org/linux-trace-kernel/20230202182309.742-2-shiju.jose@xxxxxxxxxx
Cc: <mhiramat@xxxxxxxxxx>
Cc: <mchehab@xxxxxxxxxx>
Cc: <linux-edac@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 42fb0a1e84ff5 ("tracing/ring-buffer: Have polling block on watermark")
Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 3 ---
1 file changed, 3 deletions(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9089,9 +9089,6 @@ buffer_percent_write(struct file *filp,
if (val > 100)
return -EINVAL;
- if (!val)
- val = 1;
-
tr->buffer_percent = val;
(*ppos)++;
Patches currently in stable-queue which might be from shiju.jose@xxxxxxxxxx are
queue-5.15/tracing-fix-poll-and-select-do-not-work-on-per_cpu-trace_pipe-and-trace_pipe_raw.patch
