Initial import

1 files changed, 93 insertions, 0 deletions

diff --git a/include/linux/mman.h b/include/linux/mman.h
new file mode 100644
index 000000000..16373c8f5
--- /dev/null
+++ b/include/linux/mman.h
@@ -0,0 +1,93 @@
+#ifndef _LINUX_MMAN_H
+#define _LINUX_MMAN_H
+
+#include <linux/mm.h>
+#include <linux/percpu_counter.h>
+
+#include <linux/atomic.h>
+#include <uapi/linux/mman.h>
+
+extern int sysctl_overcommit_memory;
+extern int sysctl_overcommit_ratio;
+extern unsigned long sysctl_overcommit_kbytes;
+extern struct percpu_counter vm_committed_as;
+
+#ifdef CONFIG_SMP
+extern s32 vm_committed_as_batch;
+#else
+#define vm_committed_as_batch 0
+#endif
+
+unsigned long vm_memory_committed(void);
+
+static inline void vm_acct_memory(long pages)
+{
+	__percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch);
+}
+
+static inline void vm_unacct_memory(long pages)
+{
+	vm_acct_memory(-pages);
+}
+
+/*
+ * Allow architectures to handle additional protection bits
+ */
+
+#ifndef arch_calc_vm_prot_bits
+#define arch_calc_vm_prot_bits(prot) 0
+#endif
+
+#ifndef arch_vm_get_page_prot
+#define arch_vm_get_page_prot(vm_flags) __pgprot(0)
+#endif
+
+#ifndef arch_validate_prot
+/*
+ * This is called from mprotect().  PROT_GROWSDOWN and PROT_GROWSUP have
+ * already been masked out.
+ *
+ * Returns true if the prot flags are valid
+ */
+static inline int arch_validate_prot(unsigned long prot)
+{
+	return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
+}
+#define arch_validate_prot arch_validate_prot
+#endif
+
+/*
+ * 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) |
+	       arch_calc_vm_prot_bits(prot);
+}
+
+/*
+ * 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_LOCKED,     VM_LOCKED    );
+}
+
+unsigned long vm_commit_limit(void);
+#endif /* _LINUX_MMAN_H */