mm: Introduce arch_calc_vm_flag_bits() (b3fbbea4) · Commits · 戴 / test

Similarly to arch_calc_vm_prot_bits(), introduce a dummy arch_calc_vm_flag_bits() invoked from calc_vm_flag_bits(). This macro can be overridden by architectures to insert specific VM_* flags derived from the mmap() MAP_* flags. Signed-off-by:

Kevin Brodsky <Kevin.Brodsky@arm.com> Signed-off-by:

Catalin Marinas <catalin.marinas@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org>

include/linux/mman.h

+8 −2

Original line number	Diff line number	Diff line
		@@ -78,13 +78,18 @@ static inline void vm_unacct_memory(long pages)
		}

		/*
		* Allow architectures to handle additional protection bits
		* Allow architectures to handle additional protection and flag bits. The
		* overriding macros must be defined in the arch-specific asm/mman.h file.
		*/

		#ifndef arch_calc_vm_prot_bits
		#define arch_calc_vm_prot_bits(prot, pkey) 0
		#endif

		#ifndef arch_calc_vm_flag_bits
		#define arch_calc_vm_flag_bits(flags) 0
		#endif

		#ifndef arch_vm_get_page_prot
		#define arch_vm_get_page_prot(vm_flags) __pgprot(0)
		#endif
		@@ -135,7 +140,8 @@ 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 );
		_calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) \|
		arch_calc_vm_flag_bits(flags);
		}

		unsigned long vm_commit_limit(void);

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