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b=PocMkmj7+7sN8yXHuhV/63yFz8Ku98DVQk6ZAMCytQnKdG6p6j+k3QriS+8Zmiur/ YO5L+sacJmF/7mrYHzJTvVLTaaB6d6nN6vO1fB1Mh9Ci76/g/f9TyRv3kISd60numH EVGD7oVOT8ClRWYUpxU16WOKi7A40bZDccyIpOEciwiIr+m0e5xzsuGmzw2txucZjn KJLQR2TzAidtcunf1WZXUkcjtM7Ipn5pYEPhzxUBNaAX7Hrv9rPb3+RNrz9ydFZTTv afYQ5iWZHwlXPol/+rICg1T/1ZV/Cu3fagguZZnihVZWFTHM9xht08M/kJrHDBYPFP 9fXuNssE74guQ== Message-ID: Date: Fri, 6 Feb 2026 12:06:29 +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> 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: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 32166160004 X-Stat-Signature: wrh8eijw919jbupakzs5wm6bak7jd9oo X-Rspam-User: X-HE-Tag: 1770375997-337140 X-HE-Meta: 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 ubPMcCVo 6ZLUMtOORXtG/O+20dUV3IO1irpvYgbdIoAb6xdtrPER6a8hQJwkL7QEwyooGzJ3xsTweL1huG+HTP8NEd4wnEVDHFudMozYbD/dDEmCzbov29VJVIpzDm2T1eNdeEnLB+ZgdpepZ/ICHaYvfKLP753LFoN6ASrtqXth/TcWqrao2Wxxqsa6zCelTk5eseKO5AyEAJeMJZ1Mml9CkBz6x3Y/bjmkVIUCfT/8vJ5JoUCbZnnFD0XPTJpDryaojtECr1a8+mrt16UhtT3Bsk6PKAE6PgdUOk+1vFoiiEFKpZWfUkfzY1e5T+xGUCXng3d0nrNN54IHhkU07Dr/+CVt6aM+RCWidiBDOsVPrUBBGn7FpAQx3PgCD6Vqf6AbcmzRMFrFlINLrnW1rqsTNl9lvg1sSVTXIuPe6bldhmlh2GdIRSL0sPD3FEuH/Lw== 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 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. Apart from that LGTM. -- Cheers, David