v4.19.13 snapshot.
diff --git a/include/linux/mman.h b/include/linux/mman.h
new file mode 100644
index 0000000..4b08e9c
--- /dev/null
+++ b/include/linux/mman.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#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>
+
+/*
+ * Arrange for legacy / undefined architecture specific flags to be
+ * ignored by mmap handling code.
+ */
+#ifndef MAP_32BIT
+#define MAP_32BIT 0
+#endif
+#ifndef MAP_HUGE_2MB
+#define MAP_HUGE_2MB 0
+#endif
+#ifndef MAP_HUGE_1GB
+#define MAP_HUGE_1GB 0
+#endif
+#ifndef MAP_UNINITIALIZED
+#define MAP_UNINITIALIZED 0
+#endif
+#ifndef MAP_SYNC
+#define MAP_SYNC 0
+#endif
+
+/*
+ * The historical set of flags that all mmap implementations implicitly
+ * support when a ->mmap_validate() op is not provided in file_operations.
+ */
+#define LEGACY_MAP_MASK (MAP_SHARED \
+ | MAP_PRIVATE \
+ | MAP_FIXED \
+ | MAP_ANONYMOUS \
+ | MAP_DENYWRITE \
+ | MAP_EXECUTABLE \
+ | MAP_UNINITIALIZED \
+ | MAP_GROWSDOWN \
+ | MAP_LOCKED \
+ | MAP_NORESERVE \
+ | MAP_POPULATE \
+ | MAP_NONBLOCK \
+ | MAP_STACK \
+ | MAP_HUGETLB \
+ | MAP_32BIT \
+ | MAP_HUGE_2MB \
+ | MAP_HUGE_1GB)
+
+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_batch(&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, pkey) 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 bool arch_validate_prot(unsigned long prot, unsigned long addr)
+{
+ 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)) ? 0 : \
+ ((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, unsigned long pkey)
+{
+ 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, pkey);
+}
+
+/*
+ * 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 ) |
+ _calc_vm_trans(flags, MAP_SYNC, VM_SYNC );
+}
+
+unsigned long vm_commit_limit(void);
+#endif /* _LINUX_MMAN_H */