linux-kernel - [PATCH v5 06/17] asm-generic: mm_hooks: allow hooks to be overridden individually

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Message-Id: <20181005084754.20950-7-kristina.martsenko@arm.com>
Date:   Fri,  5 Oct 2018 09:47:43 +0100
From:   Kristina Martsenko <kristina.martsenko@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Adam Wallis <awallis@...eaurora.org>,
        Amit Kachhap <Amit.Kachhap@....com>,
        Andrew Jones <drjones@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Dave P Martin <Dave.Martin@....com>,
        Jacob Bramley <jacob.bramley@....com>,
        Kees Cook <keescook@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        "Suzuki K . Poulose" <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 06/17] asm-generic: mm_hooks: allow hooks to be overridden individually

From: Mark Rutland <mark.rutland@....com>

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>
Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
Acked-by: 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 8ac4e68a12f0..2b3ee15d3702 100644
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -7,31 +7,42 @@
 #ifndef _ASM_GENERIC_MM_HOOKS_H
 #define _ASM_GENERIC_MM_HOOKS_H
 
+#ifndef arch_dup_mmap
 static inline int arch_dup_mmap(struct mm_struct *oldmm,
 				struct mm_struct *mm)
 {
 	return 0;
 }
+#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 */
-- 
2.11.0