| Message ID | 20180417183735.56985-7-mark.rutland@arm.com |
|---|---|
| State | New |
| Headers | show |
| Series | ARMv8.3 pointer authentication userspace support | expand |
On Tue, Apr 17, 2018 at 8:37 PM, Mark Rutland <mark.rutland@arm.com> wrote: > 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 Acked-by: Arnd Bergmann <arnd@arndb.de>
On Tue, Apr 17, 2018 at 09:56:02PM +0200, Arnd Bergmann wrote: > On Tue, Apr 17, 2018 at 8:37 PM, Mark Rutland <mark.rutland@arm.com> wrote: > > 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 > > Acked-by: Arnd Bergmann <arnd@arndb.de> Cheers! Mark.
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 */
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(+) -- 2.11.0