Re: [PATCH v2 10/23] microblaze: use asm-generic/mmu_context.h for no-op implementations

Michal Simek
2020-09-01T06:42:17Z

On 01. 09. 20 8:15, Nicholas Piggin wrote:
> Excerpts from Michal Simek's message of September 1, 2020 12:15 am:
>>
>>
>> On 26. 08. 20 16:52, Nicholas Piggin wrote:
>>> Cc: Michal Simek <monstr@monstr.eu>
>>> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
>>> ---
>>> arch/microblaze/include/asm/mmu_context_mm.h | 8 ++++----
>>> arch/microblaze/include/asm/processor.h | 3 ---
>>> 2 files changed, 4 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/arch/microblaze/include/asm/mmu_context_mm.h b/arch/microblaze/include/asm/mmu_context_mm.h
>>> index a1c7dd48454c..c2c77f708455 100644
>>> --- a/arch/microblaze/include/asm/mmu_context_mm.h
>>> +++ b/arch/microblaze/include/asm/mmu_context_mm.h
>>> @@ -33,10 +33,6 @@
>>> to represent all kernel pages as shared among all contexts.
>>> */
>>>
>>> -static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
>>> -{
>>> -}
>>> -
>>> # define NO_CONTEXT 256
>>> # define LAST_CONTEXT 255
>>> # define FIRST_CONTEXT 1
>>> @@ -105,6 +101,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
>>> /*
>>> * We're finished using the context for an address space.
>>> */
>>> +#define destroy_context destroy_context
>>> static inline void destroy_context(struct mm_struct *mm)
>>> {
>>> if (mm->context != NO_CONTEXT) {
>>> @@ -126,6 +123,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
>>> * After we have set current->mm to a new value, this activates
>>> * the context for the new mm so we see the new mappings.
>>> */
>>> +#define activate_mm activate_mm
>>> static inline void activate_mm(struct mm_struct *active_mm,
>>> struct mm_struct *mm)
>>> {
>>> @@ -136,5 +134,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
>>>
>>> extern void mmu_context_init(void);
>>>
>>> +#include <asm-generic/mmu_context.h>
>>> +
>>> # endif /* __KERNEL__ */
>>> #endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */
>>> diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
>>> index 1ff5a82b76b6..616211871a6e 100644
>>> --- a/arch/microblaze/include/asm/processor.h
>>> +++ b/arch/microblaze/include/asm/processor.h
>>> @@ -122,9 +122,6 @@ unsigned long get_wchan(struct task_struct *p);
>>> # define KSTK_EIP(task) (task_pc(task))
>>> # define KSTK_ESP(task) (task_sp(task))
>>>
>>> -/* FIXME */
>>> -# define deactivate_mm(tsk, mm) do { } while (0)
>>> -
>>> # define STACK_TOP TASK_SIZE
>>> # define STACK_TOP_MAX STACK_TOP
>>>
>>>
>>
>> I am fine with the patch but I pretty much don't like that commit
>> message is empty and there is only subject.
>> With fixing that you can add my:
>> Acked-by: Michal Simek <monstr@monstr.eu>
>
> Thanks for the review, will do. Any suggestion for a useful commit message?

What about?
Wire asm-generic/mmu_context.h to provide generic empty hooks for arch
code simplification.

Thanks,
Michal