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SubjectRe: [patch] "big IRQ lock" removal, 2.5.27-A1

using serial-2.5.26-3.diff, i get an oops here:

(gdb) list *0xc01b1f03
0xc01b1f03 is in serial_in (serial_8250.c:189).
184 return readb(up->port.membase + offset);
185
186 default:
187 return inb(up->port.iobase + offset);
188 }
189 }
190
191 static _INLINE_ void
192 serial_out(struct uart_8250_port *up, int offset, int value)
193 {
(gdb)
called from:

(gdb) list *0xc01b3450
0xc01b3450 is in serial8250_interrupt (serial_8250.c:946).
941 struct uart_8250_port *up;
942 unsigned int iir;
943
944 up = list_entry(l, struct uart_8250_port, list);
945
946 iir = serial_in(up, UART_IIR);
947 if (!(iir & UART_IIR_NO_INT)) {
948 spin_lock(&up->port.lock);
949 serial8250_handle_port(up, regs);
950 spin_unlock(&up->port.lock);
(gdb)
when echo-ing into a serial port, which is also set up for kernel serial
console. (the kernel serial console produces no output.)

Ingo

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