From: Helge Deller Date: Fri, 25 Aug 2023 15:46:39 +0000 (+0200) Subject: parisc: led: Reduce CPU overhead for disk & lan LED computation X-Git-Tag: v6.6.7~2077^2~17 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=358ad816e52d4253b38c2f312e6b1cbd89e0dbf7;p=platform%2Fkernel%2Flinux-starfive.git parisc: led: Reduce CPU overhead for disk & lan LED computation 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 Cc: --- diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c index 8bdc5e0..3737c10 100644 --- 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 */