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

David Hildenbrand
2025-10-23T19:38:17Z

On 20.10.25 12:37, Kevin Brodsky wrote:
> 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.

LGTM.

--
Cheers

David / dhildenb