Re: [PATCH] mm/mmu_gather: define RCU version tlb_remove_table_one() in CONFIG_MMU_GATHER_RCU_TABLE_FREE

[Wei Yang <richard.weiyang@gmail.com>]

On Tue, Feb 24, 2026 at 10:09:18AM +0800, Qi Zheng wrote:
>Hi Wei,
>
>On 2/22/26 8:45 AM, Wei Yang wrote:
>> Before commit 718b13861d22 ("x86: mm: free page table pages by RCU
>> instead of semi RCU"), the page table pages will be freed by semi RCU,
>> that is:
>> 
>>    - batch table freeing: asynchronous free by RCU
>>    - single table freeing: IPI + synchronous free
>> 
>> This commit introduce a RCU version for single table freeing to support
>> PT_RECLAIM. While it is not necessary to limit the RCU version only in
>> CONFIG_PT_RECLAIM. It is reasonable to asynchronous free single table by
>> RCU if CONFIG_MMU_GATHER_RCU_TABLE_FREE.
>> 
>> This patch moves the definition of single table freeing in
>> CONFIG_MMU_GATHER_RCU_TABLE_FREE, so we have both RCU version
>> batch/single table freeing if CONFIG_MMU_GATHER_RCU_TABLE_FREE.
>
>Thank you for doing this, but we can't do it right now.
>
>See the latest version: https://github.com/torvalds/linux/commit/9c8c02df3f8742f6db927e787ab971fd0b5ac08a,
>when the
>HAVE_ARCH_TLB_REMOVE_TABLE is selected, the pt_rcu_head member
>cannot be used.
>

Thanks for point out. Don't notice the latest change.

Andrew,

Sorry for the bothering. Please drop this one.

-- 
Wei Yang
Help you, Help me