The patch titled
Subject: provide linux/set_memory.h
has been added to the -mm tree. Its filename is
provide-linux-set_memoryh.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/provide-linux-set_memoryh.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/provide-linux-set_memoryh.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxx
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/set_memory.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff -puN /dev/null include/linux/set_memory.h
--- /dev/null
+++ a/include/linux/set_memory.h
@@ -0,0 +1,20 @@
+/*
+ * 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_ */
_
Patches currently in -mm which might be from mpe@xxxxxxxxxxxxxx are
provide-linux-set_memoryh.patch
pm-hibernate-use-linux-set_memoryh.patch
module-use-linux-set_memoryh.patch
bpf-use-linux-set_memoryh.patch
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