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Subject[PATCHv2 01/12] 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 <>
Cc: Arnd Bergmann <>
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 ea189d88a3cc..34edf0850d49 100644
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -7,30 +7,41 @@

+#ifndef arch_dup_mmap
static inline void arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm)

+#ifndef arch_exit_mmap
static inline void arch_exit_mmap(struct mm_struct *mm)

+#ifndef arch_unmap
static inline void arch_unmap(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long start, unsigned long end)

+#ifndef arch_bprm_mm_init
static inline void arch_bprm_mm_init(struct mm_struct *mm,
struct vm_area_struct *vma)

+#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 /* _ASM_GENERIC_MM_HOOKS_H */
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