/alps/pcitool

/**

 *

 * @file compat.h

 * @author Michael Stapelberg

 * @date 2009-04-05

 * @brief Contains compatibility definitions for the different linux kernel versions to avoid

 * putting ifdefs all over the driver code.

 *

 */

#ifndef _COMPAT_H

#define _COMPAT_H

#include <linux/version.h>

/* Check macros and kernel version first */

#ifndef KERNEL_VERSION

# error "No KERNEL_VERSION macro! Stopping."

#endif

#ifndef LINUX_VERSION_CODE

# error "No LINUX_VERSION_CODE macro! Stopping."

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)

# error "Linux 3.2 and latter are supported"

#endif

/* VM_RESERVED is removed in 3.7-rc1 */

#ifndef VM_RESERVED

# define  VM_RESERVED   (VM_DONTEXPAND | VM_DONTDUMP)

#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)

# define __devinit

# define __devexit

# define __devinitdata

#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0)

# define get_user_pages_compat(vma, nr, pages) get_user_pages(vma, nr, FOLL_WRITE, pages, NULL)

#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)

# define get_user_pages_compat(vma, nr, pages) get_user_pages(vma, nr, 1, 0, pages, NULL)

#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,159))

    // Looks like some updates from 4.9 were backported to 4.4 LTS kernel. On Ubuntu, at least 4.4.159 needs this variant

# define get_user_pages_compat(vma, nr, pages) get_user_pages(current, current->mm, vma, nr, FOLL_WRITE, pages, NULL)

#else

# define get_user_pages_compat(vma, nr, pages) get_user_pages(current, current->mm, vma, nr, 1, 0, pages, NULL)

#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,5,0)

# define ioremap_nocache ioremap

// ioremap_nocache and ioremap are now platform independent and identical, as of

// Kernel Version 5.5

// https://lore.kernel.org/linux-mips/20191209194819.GA28157@lst.de/T/ 

#endif

#endif