This is a note to let you know that I've just added the patch titled
parisc: led: Reduce CPU overhead for disk & lan LED computation
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:
parisc-led-reduce-cpu-overhead-for-disk-lan-led-computation.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 358ad816e52d4253b38c2f312e6b1cbd89e0dbf7 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 25 Aug 2023 17:46:39 +0200
Subject: parisc: led: Reduce CPU overhead for disk & lan LED computation
From: Helge Deller <deller@xxxxxx>
commit 358ad816e52d4253b38c2f312e6b1cbd89e0dbf7 upstream.
Older PA-RISC machines have LEDs which show the disk- and LAN-activity.
The computation is done in software and takes quite some time, e.g. on a
J6500 this may take up to 60% time of one CPU if the machine is loaded
via network traffic.
Since most people don't care about the LEDs, start with LEDs disabled and
just show a CPU heartbeat LED. The disk and LAN LEDs can be turned on
manually via /proc/pdc/led.
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/parisc/led.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -56,8 +56,8 @@
static int led_type __read_mostly = -1;
static unsigned char lastleds; /* LED state from most recent update */
static unsigned int led_heartbeat __read_mostly = 1;
-static unsigned int led_diskio __read_mostly = 1;
-static unsigned int led_lanrxtx __read_mostly = 1;
+static unsigned int led_diskio __read_mostly;
+static unsigned int led_lanrxtx __read_mostly;
static char lcd_text[32] __read_mostly;
static char lcd_text_default[32] __read_mostly;
static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-5.4/parisc-led-reduce-cpu-overhead-for-disk-lan-led-computation.patch
queue-5.4/parisc-fix-proc-cpuinfo-output-for-lscpu.patch
queue-5.4/parisc-led-fix-lan-receive-and-transmit-leds.patch
