/* $Id: compat.h,v 1.42.2.17 2009/01/23 17:01:02 mikpe Exp $

 * Performance-monitoring counters driver.

 * Compatibility definitions for 2.6 kernels.

 *

 * Copyright (C) 1999-2009  Mikael Pettersson

 */

#include <linux/version.h>

#include "cpumask.h"

#define EXPORT_SYMBOL_mmu_cr4_features	EXPORT_SYMBOL(mmu_cr4_features)

/* Starting with 2.6.16-rc1, put_task_struct() uses an RCU callback

   __put_task_struct_cb() instead of the old __put_task_struct().

   2.6.16-rc6 dropped the EXPORT_SYMBOL() of __put_task_struct_cb().

   2.6.17-rc1 reverted to using __put_task_struct() again. */

#if defined(HAVE_EXPORT___put_task_struct)

/* 2.6.5-7.201-suse added EXPORT_SYMBOL_GPL(__put_task_struct) */

/* 2.6.16.46-0.12-suse added EXPORT_SYMBOL(__put_task_struct_cb) */

#define EXPORT_SYMBOL___put_task_struct	/*empty*/

#elif LINUX_VERSION_CODE == KERNEL_VERSION(2,6,16)

#define EXPORT_SYMBOL___put_task_struct	EXPORT_SYMBOL(__put_task_struct_cb)

#else

#define EXPORT_SYMBOL___put_task_struct	EXPORT_SYMBOL(__put_task_struct)

#endif

#define task_siglock(tsk)	((tsk)->sighand->siglock)

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4)	/* names changed in 2.6.4-rc2 */

#define sysdev_register(dev)	sys_device_register((dev))

#define sysdev_unregister(dev)	sys_device_unregister((dev))

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10) /* remap_page_range() obsoleted in 2.6.10-rc1 */

#include <linux/mm.h>

static inline int

remap_pfn_range(struct vm_area_struct *vma, unsigned long uvaddr,

		unsigned long pfn, unsigned long size, pgprot_t prot)

{

	return remap_page_range(vma, uvaddr, pfn << PAGE_SHIFT, size, prot);

}

#endif

#if !defined(DEFINE_SPINLOCK) /* added in 2.6.11-rc1 */

#define DEFINE_SPINLOCK(x)	spinlock_t x = SPIN_LOCK_UNLOCKED

#endif

/* 2.6.16 introduced a new mutex type, replacing mutex-like semaphores. */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)

#define DEFINE_MUTEX(mutex)	DECLARE_MUTEX(mutex)

#define mutex_lock(mutexp)	down(mutexp)

#define mutex_unlock(mutexp)	up(mutexp)

#endif

/* 2.6.18-8.1.1.el5 replaced ptrace with utrace */

#if defined(CONFIG_UTRACE)

/* alas, I don't yet know how to convert this to utrace */

static inline int ptrace_check_attach(struct task_struct *task, int kill) { return -ESRCH; }

#endif

/* 2.6.20-rc1 moved filp->f_dentry and filp->f_vfsmnt into filp->fpath */

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)

#define filp_dentry(filp)	((filp)->f_path.dentry)

#define filp_vfsmnt(filp)	((filp)->f_path.mnt)

#else

#define filp_dentry(filp)	((filp)->f_dentry)

#define filp_vfsmnt(filp)	((filp)->f_vfsmnt)

#endif

/* 2.6.24 introduced find_task_by_vpid() and task_pid_vnr().

   2.6.26 deprecated find_task_by_pid() and 2.6.27-rc1 removed it.

   We'll use 2.6.26 as the switch-over point. */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)

static inline struct task_struct *perfctr_find_task_by_vpid(pid_t nr)

{

	return find_task_by_pid(nr);

}

#undef find_task_by_vpid

#define find_task_by_vpid(nr)	perfctr_find_task_by_vpid((nr))

static inline pid_t perfctr_task_pid_vnr(const struct task_struct *tsk)

{

	return tsk->pid;

}

#undef task_pid_vnr

#define task_pid_vnr(tsk)	perfctr_task_pid_vnr((tsk))

#endif

/* 2.6.27-rc1 dropped the retry parameter from smp_call_function()

   and on_each_cpu() -- we always called it with retry == 1 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)

static inline int perfctr_smp_call_function(

	void (*func)(void *info), void *info, int wait)

{

	return smp_call_function(func, info, 1, wait);

}

#undef smp_call_function

#define smp_call_function(f,i,w)	perfctr_smp_call_function((f),(i),(w))

static inline int perfctr_on_each_cpu(

	void (*func)(void *info), void *info, int wait)

{

	return on_each_cpu(func, info, 1, wait);

}

#undef on_each_cpu

#define on_each_cpu(f,i,w)	perfctr_on_each_cpu((f),(i),(w))

#endif

/* 2.6.29-rc1 changed how ->fsuid and ->fsgid are accessed */

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)) && !defined(current_fsuid)

#define current_fsuid()	(current->fsuid)

#define current_fsgid()	(current->fsgid)

#endif