Make es18xx.c and opl3sa2.c compile again,
(CONFIG_SND_ES18XX, CONFIG_SND_OPL3SA2)
as in linux-2.6-snd-fix-snd-sb16-ko-compile.patch
kabe at sra-tohoku.co.jp

*** linux-2.6.18.i686/sound/isa/opl3sa2.c.orig	Wed May 25 17:25:54 2011
--- linux-2.6.18.i686/sound/isa/opl3sa2.c	Sun May 29 11:18:34 2011
***************
*** 294,300 ****
  	return 0;
  }
  
! static irqreturn_t snd_opl3sa2_interrupt(int irq, void *dev_id)
  {
  	unsigned short status;
  	struct snd_opl3sa2 *chip = dev_id;
--- 294,300 ----
  	return 0;
  }
  
! static irqreturn_t snd_opl3sa2_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  {
  	unsigned short status;
  	struct snd_opl3sa2 *chip = dev_id;
***************
*** 312,318 ****
  
  	if ((status & 0x10) && chip->rmidi != NULL) {
  		handled = 1;
! 		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
  	}
  
  	if (status & 0x07) {	/* TI,CI,PI */
--- 312,318 ----
  
  	if ((status & 0x10) && chip->rmidi != NULL) {
  		handled = 1;
! 		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data, regs);
  	}
  
  	if (status & 0x07) {	/* TI,CI,PI */
*** linux-2.6.18.i686/sound/isa/es18xx.c.orig	Wed May 25 17:25:55 2011
--- linux-2.6.18.i686/sound/isa/es18xx.c	Sun May 29 09:28:43 2011
***************
*** 754,760 ****
  		return snd_es18xx_playback2_trigger(chip, substream, cmd);
  }
  
! static irqreturn_t snd_es18xx_interrupt(int irq, void *dev_id)
  {
  	struct snd_es18xx *chip = dev_id;
  	unsigned char status;
--- 754,760 ----
  		return snd_es18xx_playback2_trigger(chip, substream, cmd);
  }
  
! static irqreturn_t snd_es18xx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  {
  	struct snd_es18xx *chip = dev_id;
  	unsigned char status;
***************
*** 799,805 ****
  
  	/* MPU */
  	if ((status & MPU_IRQ) && chip->rmidi)
! 		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
  
  	/* Hardware volume */
  	if (status & HWV_IRQ) {
--- 799,805 ----
  
  	/* MPU */
  	if ((status & MPU_IRQ) && chip->rmidi)
! 		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data, regs);
  
  	/* Hardware volume */
  	if (status & HWV_IRQ) {