Re: [PATCH v3 05/13] mm: introduce CONFIG_ARCH_LAZY_MMU

Kevin Brodsky
2025-10-20T10:37:50Z

On 18/10/2025 11:52, Mike Rapoport wrote:
>> @@ -231,7 +231,7 @@ static inline int pmd_dirty(pmd_t pmd)
>> * held, but for kernel PTE updates, no lock is held). Nesting is not permitted
>> * and the mode cannot be used in interrupt context.
>> */
>> -#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
>> +#ifndef CONFIG_ARCH_LAZY_MMU
>> static inline void arch_enter_lazy_mmu_mode(void) {}
>> static inline void arch_leave_lazy_mmu_mode(void) {}
>> static inline void arch_flush_lazy_mmu_mode(void) {}
>> diff --git a/mm/Kconfig b/mm/Kconfig
>> index 0e26f4fc8717..2fdcb42ca1a1 100644
>> --- a/mm/Kconfig
>> +++ b/mm/Kconfig
>> @@ -1372,6 +1372,9 @@ config PT_RECLAIM
>> config FIND_NORMAL_PAGE
>> def_bool n
>>
>> +config ARCH_LAZY_MMU
>> + bool
>> +
> I think a better name would be ARCH_HAS_LAZY_MMU and the config option fits
> better to arch/Kconfig.

Sounds fine by me - I'm inclined to make it slightly longer still,
ARCH_HAS_LAZY_MMU_MODE, to avoid making "LAZY_MMU" sound like some HW
feature.

- Kevin