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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/mman.h
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@@ -57,8 +57,12 @@
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 #ifdef CONFIG_SMP
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 extern s32 vm_committed_as_batch;
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+extern void mm_compute_batch(int overcommit_policy);
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 #else
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 #define vm_committed_as_batch 0
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+static inline void mm_compute_batch(int overcommit_policy)
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+{
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+}
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 #endif
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 unsigned long vm_memory_committed(void);
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@@ -74,11 +78,16 @@
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 }
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 /*
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- * Allow architectures to handle additional protection bits
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+ * Allow architectures to handle additional protection and flag bits. The
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+ * overriding macros must be defined in the arch-specific asm/mman.h file.
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  */
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 #ifndef arch_calc_vm_prot_bits
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 #define arch_calc_vm_prot_bits(prot, pkey) 0
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+#endif
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+
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+#ifndef arch_calc_vm_flag_bits
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+#define arch_calc_vm_flag_bits(flags) 0
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 #endif
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 #ifndef arch_vm_get_page_prot
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@@ -97,6 +106,19 @@
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 	return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
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 }
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 #define arch_validate_prot arch_validate_prot
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+#endif
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+
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+#ifndef arch_validate_flags
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+/*
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+ * This is called from mmap() and mprotect() with the updated vma->vm_flags.
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+ *
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+ * Returns true if the VM_* flags are valid.
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+ */
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+static inline bool arch_validate_flags(unsigned long flags)
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+{
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+	return true;
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+}
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+#define arch_validate_flags arch_validate_flags
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 #endif
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 /*
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@@ -131,7 +153,8 @@
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 	return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
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 	       _calc_vm_trans(flags, MAP_DENYWRITE,  VM_DENYWRITE ) |
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 	       _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    ) |
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-	       _calc_vm_trans(flags, MAP_SYNC,	     VM_SYNC      );
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+	       _calc_vm_trans(flags, MAP_SYNC,	     VM_SYNC      ) |
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+	       arch_calc_vm_flag_bits(flags);
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 }
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 unsigned long vm_commit_limit(void);