Commit 938f8464 authored Jul 06, 2017 by Michael Ellerman Committed by Linus Torvalds Jul 06, 2017

provide linux/set_memory.h

Currently code that wants to use set_memory_ro() etc, needs to include
asm/set_memory.h, which doesn't exist on all arches.  Some code knows it
only builds on arches which have the header, other code guards the
inclusion with an #ifdef, neither is ideal.

So create linux/set_memory.h.  This always exists, so users don't need
an #ifdef just to include the header.

When CONFIG_ARCH_HAS_SET_MEMORY=y it includes asm/set_memory.h,
otherwise it provides empty non-failing implementations.

Link: http://lkml.kernel.org/r/1498717781-29151-1-git-send-email-mpe@ellerman.id.au


Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d9f91f84

include/linux/set_memory.h

0 → 100644

+20 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2017, Michael Ellerman, IBM Corporation.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License version
		* 2 as published by the Free Software Foundation;
		*/
		#ifndef _LINUX_SET_MEMORY_H_
		#define _LINUX_SET_MEMORY_H_

		#ifdef CONFIG_ARCH_HAS_SET_MEMORY
		#include <asm/set_memory.h>
		#else
		static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
		static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
		static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
		static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
		#endif

		#endif /* _LINUX_SET_MEMORY_H_ */

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