ttyS* names missing in /proc/interrupts?

ttyS* names missing in /proc/interrupts?

[Meelis Roos]

Just noticed in 2.6.29-rc7+git: lines corresponding to 8250 ttyS* 
serial ports have no device name in /proc interrupts:

           CPU0
  0:         35    XT-PIC-XT        timer
  1:        338    XT-PIC-XT        i8042
  2:          0    XT-PIC-XT        cascade
  3:          3    XT-PIC-XT
  4:          3    XT-PIC-XT
  6:          5    XT-PIC-XT        floppy
  7:          1    XT-PIC-XT        parport0
  8:          2    XT-PIC-XT        rtc0
  9:         41    XT-PIC-XT        acpi, qla2xxx, tr1
 10:          1    XT-PIC-XT        Intel 82801BA-ICH2
 11:     160060    XT-PIC-XT        uhci_hcd:usb1, uhci_hcd:usb2, lpfc, tr0, eth0, mga@pci:0000:02:00.0
 12:        141    XT-PIC-XT        i8042
 14:      88730    XT-PIC-XT        ata_piix
 15:    1190012    XT-PIC-XT        ata_piix
NMI:          0   Non-maskable interrupts
LOC:    1028718   Local timer interrupts
TRM:          0   Thermal event interrupts
SPU:          0   Spurious interrupts
ERR:          0

$ dmesg | grep tty
console [tty0] enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:09: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

And similarly on another machine.

-- 
Meelis Roos (mroos@linux.ee)

Re: ttyS* names missing in /proc/interrupts?

[H. Peter Anvin]

Meelis Roos wrote:
> Just noticed in 2.6.29-rc7+git: lines corresponding to 8250 ttyS* 
> serial ports have no device name in /proc interrupts:

They only show up while the ports are open and the interrupt enabled.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.