[PATCHv2,01/12] asm-generic: mm_hooks: allow hooks to be overridden individually

Message ID 20171127163806.31435-2-mark.rutland@arm.com
State Superseded
Headers show
  • ARMv8.3 pointer authentication userspace support
Related show

Commit Message

Mark Rutland Nov. 27, 2017, 4:37 p.m.
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@arm.com>

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.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 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 */