#ifndef _LINUX_MMAN_H #define _LINUX_MMAN_H #include #define MREMAP_MAYMOVE 1 #define MREMAP_FIXED 2 #define OVERCOMMIT_GUESS 0 #define OVERCOMMIT_ALWAYS 1 #define OVERCOMMIT_NEVER 2 #ifdef __KERNEL__ #include #include 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 ) | #ifdef CONFIG_PAX_SEGMEXEC _calc_vm_trans(flags, MAP_MIRROR, VM_MIRROR) | #endif _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 */