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imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WezqA93r; spf=pass (imf17.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770378362; a=rsa-sha256; cv=none; b=JRsSrjdI3DzziMDzSnddXSjU/mI+tIlZ/MVtJEyy2QwSRGuzksAXUW8rdzLgdlZeVYiBQw YcOis3k+f+d4cYIfhH2NvbfIHoOIU4oUiDi0ZBkrd91A08Boz6MJqVX2qVjSQrIR+Sv+Fc 0UX64MsuE8k7eq6nwnU9qfO/wjv5KGQ= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 79E3E435A9; Fri, 6 Feb 2026 11:46:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DE15C19421; Fri, 6 Feb 2026 11:45:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770378361; bh=XT3tvSr7Whaw/wGhA/JRmGY0OYnnLn73hOQlr1eO6WQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=WezqA93rvVzTGU8jXDMPN8JLufLwqx66hpVWUezvwvv0fRxUfY8lHiQOmnTTMN0tM A1kU4DDF0/Vvwr9vwmJBH2Yp9i7tnP3VXf8XS6ATyIFYwVroEdgP/Zzed84yUGL07f SyegMd3Kg/Q9ePk2keJeh7hlU+AaJi9ONGG+2aOPpgYP7Dtlcw+CxnDOhAf/YlGuSs bWqD2azVr3W/7p+2IvZnHMJZc4Tvua5g6AkklfWZu9LA3mmdg5Rjnhh+kQvRvR2dRy LO9yRg4WBo0bxfcbeVcdh25k5Y+QqAjaeWfa9fT5o15B0aJh5RE1SEP/SYhhUjfmpQ ikfgjfD/5/Ftg== Message-ID: <538fef61-3903-407e-8486-538a28b99e9d@kernel.org> Date: Fri, 6 Feb 2026 12:45:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 7/8] mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config To: Qi Zheng , andreas@gaisler.com, richard.weiyang@gmail.com, will@kernel.org, peterz@infradead.org, aneesh.kumar@kernel.org, npiggin@gmail.com, dev.jain@arm.com, ioworker0@gmail.com, linmag7@gmail.com, akpm@linux-foundation.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, sparclinux@vger.kernel.org, Qi Zheng References: <5ebfa3d4b56e63c6906bda5eccaa9f7194d3a86b.1769515122.git.zhengqi.arch@bytedance.com> <1663ae90-3247-4e12-a25a-049fc3281e19@linux.dev> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: t8dguau9h55bd8pr9tun8zi8b65adtgk X-Rspamd-Queue-Id: 8472640005 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1770378362-714343 X-HE-Meta: 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 YeL6842S lnejRQFoiYdCeVDt/zfxVlzwRaU0KD/+eniT8illDRgBckvEz4KZeIzWDqAuYTQMULp6Er/d0tMVyl0ganRfeATuodDSbOXeu4B9f1EZ2v8oMJgehm+nnlVhq03GLwRc768BqvTXzxLCVW9QG9aH4zN13X7hxdfvdU7f81/Fk3/C771ndP6UUFjxKB53nqLeHiN9svyOMEY8rRoAclsJRdZEGn5FMqD5HrdvBZq2IP2T0znDm1kGEd4g2TK4LRI7gqPeUT/cJx9Y8H4ksBqgpW08iyaZdIJq4e3QH/8WT8AZ6kRCWo5xm2rRxwExsZqUICW1LHGayUJtF6d2cFOJ99vA2tpbfwOMWjVxovYKTHI67ZK5pjcCSt7m7WOStlmCBQz9KIqi6F8IcA+sYo30x1CWkUAoJ3RlYdtcmMBeQ1oZYfj5z2jSRSD3yVRsB0OZssoXjHfnwQ8/DlXU2ssRlCyKsuQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/6/26 12:13, Qi Zheng wrote: > > > On 2/6/26 7:06 PM, David Hildenbrand (Arm) wrote: >> On 1/27/26 13:13, Qi Zheng wrote: >>> From: Qi Zheng >>> >>> For architectures that define __HAVE_ARCH_TLB_REMOVE_TABLE, the page >>> tables at the pmd/pud level are generally not of struct ptdesc type, and >>> do not have pt_rcu_head member, thus these architectures cannot support >>> PT_RECLAIM. >>> >>> In preparation for enabling PT_RECLAIM on more architectures, convert >>> __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE >>> config, >>> so that we can make conditional judgments in Kconfig. >>> >>> Signed-off-by: Qi Zheng >>> --- >>>   arch/powerpc/Kconfig            | 1 + >>>   arch/powerpc/include/asm/tlb.h  | 1 - >>>   arch/sparc/Kconfig              | 1 + >>>   arch/sparc/include/asm/tlb_64.h | 1 - >>>   include/asm-generic/tlb.h       | 2 +- >>>   mm/Kconfig                      | 3 +++ >>>   6 files changed, 6 insertions(+), 3 deletions(-) >>> >>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >>> index 9537a61ebae02..b47aa8fd62742 100644 >>> --- a/arch/powerpc/Kconfig >>> +++ b/arch/powerpc/Kconfig >>> @@ -304,6 +304,7 @@ config PPC >>>       select LOCK_MM_AND_FIND_VMA >>>       select MMU_GATHER_PAGE_SIZE >>>       select MMU_GATHER_RCU_TABLE_FREE >>> +    select HAVE_ARCH_TLB_REMOVE_TABLE >>>       select MMU_GATHER_MERGE_VMAS >>>       select MMU_LAZY_TLB_SHOOTDOWN        if PPC_BOOK3S_64 >>>       select MODULES_USE_ELF_RELA >>> diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/ >>> asm/tlb.h >>> index 2058e8d3e0138..1ca7d4c4b90db 100644 >>> --- a/arch/powerpc/include/asm/tlb.h >>> +++ b/arch/powerpc/include/asm/tlb.h >>> @@ -37,7 +37,6 @@ extern void tlb_flush(struct mmu_gather *tlb); >>>    */ >>>   #define tlb_needs_table_invalidate()    radix_enabled() >>> -#define __HAVE_ARCH_TLB_REMOVE_TABLE >>>   /* Get the generic bits... */ >>>   #include >>> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig >>> index a630d373e6453..25fa2908d6152 100644 >>> --- a/arch/sparc/Kconfig >>> +++ b/arch/sparc/Kconfig >>> @@ -74,6 +74,7 @@ config SPARC64 >>>       select HAVE_KRETPROBES >>>       select HAVE_KPROBES >>>       select MMU_GATHER_RCU_TABLE_FREE if SMP >>> +    select HAVE_ARCH_TLB_REMOVE_TABLE if SMP >> >> Why the SMP? At least in tlb_64.h, it was not protected by SMP IIUC. > > Ah, It's just simply aligned with the MMU_GATHER_RCU_TABLE_FREE above. But does that work as expected for !SMP? -- Cheers, David