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Commit b88626c4 authored by Helge Deller's avatar Helge Deller Committed by Greg Kroah-Hartman
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parisc: led: Reduce CPU overhead for disk & lan LED computation 



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: default avatarHelge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 536f3092

drivers/parisc/led.c

+2 −2
Original line number Diff line number Diff line
@@ -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 */