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Message-Id: <1500480092-28480-3-git-send-email-mark.rutland@arm.com>
Date: Wed, 19 Jul 2017 17:01:23 +0100
From: Mark Rutland <mark.rutland@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: arnd@...db.de,
catalin.marinas@....com,
christoffer.dall@...aro.org,
Dave.Martin@....com,
jiong.wang@....com,
kvmarm@...ts.cs.columbia.edu,
linux-arch@...r.kernel.org,
marc.zyngier@....com,
mark.rutland@....com,
suzuki.poulose@....com,
will.deacon@....com,
yao.qi@....com,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH 02/11] asm-generic: mm_hooks: allow hooks to be overridden individually
Currently, an architecture must either implement all of the mm hooks
itself, or use all of those provided by the asm-generic implementation.
When an architecture only needs to override a single hook, it must copy
the stub implementations from the asm-generic version.
To avoid this repetition, allow each hook to be overridden indiviually,
by placing each under an #ifndef block. As architectures providing their
own hooks can't include this file today, this shouldn't adversely affect
any existing hooks.
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-arch@...r.kernel.org
---
include/asm-generic/mm_hooks.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h
index 41e5b67..b4bf1b8 100644
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -6,30 +6,41 @@
#ifndef _ASM_GENERIC_MM_HOOKS_H
#define _ASM_GENERIC_MM_HOOKS_H
+#ifndef arch_dup_mmap
static inline void arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm)
{
}
+#endif
+#ifndef arch_exit_mmap
static inline void arch_exit_mmap(struct mm_struct *mm)
{
}
+#endif
+#ifndef arch_unmap
static inline void arch_unmap(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
}
+#endif
+#ifndef arch_bprm_mm_init
static inline void arch_bprm_mm_init(struct mm_struct *mm,
struct vm_area_struct *vma)
{
}
+#endif
+#ifndef arch_vma_access_permitted
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
bool write, bool execute, bool foreign)
{
/* by default, allow everything */
return true;
}
+#endif
+
#endif /* _ASM_GENERIC_MM_HOOKS_H */
--
1.9.1
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