linux-kernel - Re: [PATCH v2 10/23] microblaze: use asm-generic/mmu

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Date:   Tue, 01 Sep 2020 16:15:21 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     linux-arch@...r.kernel.org, Michal Simek <monstr@...str.eu>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH v2 10/23] microblaze: use asm-generic/mmu_context.h for
 no-op implementations

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@...str.eu>
>> Signed-off-by: Nicholas Piggin <npiggin@...il.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@...str.eu>

Thanks for the review, will do. Any suggestion for a useful commit message?

Thanks,
Nick