Explication: i am a newbie in kernel prog. and i try to write a module for an can-bus pci card but the problem begin. In the module i want to create the /dev/ file with mknod function. The function was not exported by the kernel, so i found in the _syscall table adress for call sys_mknod but the function test if the parameter is on user memory space or not and if it is in kernel space the function fail (return -EFAULT) I try to allocate user-sapce memory whih void* ptr; ptr=kmalloc (size,GFP_USER); but kmalloc return an kernel-space memory adress and mknod don't work (i think this cause sys_mknod return -EFAULT again). I try to compare the returned adress by kmalloc with printk and adress i same with GFP_USER or GFP_KERNEL (always betwen C0000000 and FFFFFFFF) Question: What's wrong with my kmalloc usage ? Does it exist another way to create the /dev/ file inside my driver ? Why kernel module can't simply do a mknod ? Why kmalloc don't give me the specified memory ? (i try kmalloc (size,GFP_KERNEL) and ptr is pointing at the same adress than when i used GFP_USER) Thank to all - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
