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#ifndef _LINUX_MMAN_H

#define _LINUX_MMAN_H

#include <asm/mman.h>

#define MREMAP_MAYMOVE  1

#define MREMAP_FIXED    2

#define OVERCOMMIT_GUESS                0

#define OVERCOMMIT_ALWAYS               1

#define OVERCOMMIT_NEVER                2

#ifdef __KERNEL__

#include <linux/mm.h>

#include <asm/atomic.h>

extern int sysctl_overcommit_memory;

extern int sysctl_overcommit_ratio;

extern atomic_t vm_committed_space;

#ifdef CONFIG_SMP

extern void vm_acct_memory(long pages);

#else

static inline void vm_acct_memory(long pages)

{

        atomic_add(pages, &vm_committed_space);

}

#endif

static inline void vm_unacct_memory(long pages)

{

        vm_acct_memory(-pages);

}

/*

 * Optimisation macro.  It is equivalent to:

 *      (x & bit1) ? bit2 : 0

 * but this version is faster.

 * ("bit1" and "bit2" must be single bits)

 */

#define _calc_vm_trans(x, bit1, bit2) \

  ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \

   : ((x) & (bit1)) / ((bit1) / (bit2)))

/*

 * Combine the mmap "prot" argument into "vm_flags" used internally.

 */

static inline unsigned long

calc_vm_prot_bits(unsigned long prot)

{

        return _calc_vm_trans(prot, PROT_READ,  VM_READ ) |

               _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |

               _calc_vm_trans(prot, PROT_EXEC,  VM_EXEC );

}

/*

 * Combine the mmap "flags" argument into "vm_flags" used internally.

 */

static inline unsigned long

calc_vm_flag_bits(unsigned long flags)

{

        return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |

               _calc_vm_trans(flags, MAP_DENYWRITE,  VM_DENYWRITE ) |

               _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) |

               _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    );

}

#endif /* __KERNEL__ */

#endif /* _LINUX_MMAN_H */