Compile kernel driver failed when processing __user

915086731 · 01-18-2014, 08:19 AM

I get a compile error when compiling a kernel driver.The error info is

Code:

pxa270_gpio_led_drv.c|27 col 70| error: expected ‘;’, ‘,’ or ‘)’ before ‘*’ token
||  static ssize_t SIMPLE_GPIO_LED_read ( struct file *file, char __user *buf, size_t count, loff_t *offset)

Part of the source file is:

Code:

static ssize_t SIMPLE_GPIO_LED_read ( struct file *file, char __user *buf, size_t count, loff_t *offset) 
{
#ifdef OURS_GPIO_LED_DEBUG 
printk ("SIMPLE_GPIO_LED_read [ --kernel--]\n"); 
#endif 
return count; 
}

The compile command is :

Code:

 gcc -c -Wall -O -D__KERNEL__ -DMODULE -I/home/test/Desktop/linux-2.4.21/include   pxa270_gpio_led_drv.c -o pxa270_gpio_led_drv.o

Can anyone help me? Thanks.

smallpond · 01-19-2014, 06:46 PM

I don't recall seeing gcc print the source line with '|| ' at the beginning of the line. What version are you using?

ianbb01 · 01-30-2014, 09:35 AM

You probably have an undefined type. Make sure that __user macro is properly defined.