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b=ZbpzBxMPlijcUIWVvcKZTNGa7zCAJwZY9chXx+w8GbRHAR+rI1lSfYrqXSSvSDYaE MePEVV4EjqdFYyQgiSidQHYaWwO7pQarT3TKZOtNh3sSfSwIQ6SflX1gDL9lMSxLny w06MV9gY5w5TZlc4+ewlulKiXr9osdtN3qFwbuQWIMM4miVH0RvJzhNpO1lxypNit0 eeE/heuKvBJlnAAv4sK4Mv4MYw7Xohrvhu7Amo4HOBaY8PCND2DXnAiONttsXskaMh 8/Bno4vIYUEF05KYxb1WyXsUI4O64niqkk/pUg+0oPMnWbdq0tM2VTdA0KoQ6gV8im c4sJ+iwsxJ/XQ== Message-ID: <9b55623a-4606-4610-a0fe-55b8cd6b95e7@kernel.org> Date: Wed, 19 Nov 2025 12:38:46 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 7/7] mm: enable PT_RECLAIM on all 64-bit architectures To: Qi Zheng , will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, dev.jain@arm.com, akpm@linux-foundation.org, ioworker0@gmail.com, linmag7@gmail.com 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, Qi Zheng References: From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: AF4B340016 X-Stat-Signature: m31gegs4ec35phpkdxz8jjjcm87nt1n3 X-Rspam-User: X-HE-Tag: 1763552335-981251 X-HE-Meta: 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 JYpoaLni ApLX+5JwTMVqz3iMkCJ94BZ/YqqRvJFPfMFxy+dFHsocBy9PF5aeuyGD6cs4whktHcFqy8Hn/3n9Y88X4EXu9QL6BCHSpijDG4V5eyi/qluZyMD+lX4kXmkNSskysjn+/pXWN6qvyLhDw7lyMX4ZZcqzju+mO8OpZdg17L663KpV06QddAsvpBdepNAAwARgy5210wJZV1VI6VdOBhGXAHFsSwL4CYwVP0EmJ4QsilkLPRd8kO0zb9/bHJTcYGc7Jl54zX1rrPYgPaCm279f03Zf9xt0g8q75B33xDWyqNt2Dk+u1X9S3TkyLVU4KqSN8LRtVPf4t7TjBKts= 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 19.11.25 08:31, Qi Zheng wrote: > From: Qi Zheng > > Now, the MMU_GATHER_RCU_TABLE_FREE is enabled on all 64-bit architectures, > so make PT_RECLAIM depend on 64BIT, thereby enabling PT_RECLAIM on all > 64-bit architectures. > > Signed-off-by: Qi Zheng > --- > arch/x86/Kconfig | 1 - > mm/Kconfig | 9 ++------- > 2 files changed, 2 insertions(+), 8 deletions(-) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index eac2e86056902..96bff81fd4787 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -330,7 +330,6 @@ config X86 > select FUNCTION_ALIGNMENT_4B > imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI > select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE > - select ARCH_SUPPORTS_PT_RECLAIM if X86_64 > select ARCH_SUPPORTS_SCHED_SMT if SMP > select SCHED_SMT if SMP > select ARCH_SUPPORTS_SCHED_CLUSTER if SMP > diff --git a/mm/Kconfig b/mm/Kconfig > index d548976d0e0ad..94eec5c0cad96 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -1448,14 +1448,9 @@ config ARCH_HAS_USER_SHADOW_STACK > The architecture has hardware support for userspace shadow call > stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss). > > -config ARCH_SUPPORTS_PT_RECLAIM > - def_bool n > - > config PT_RECLAIM > - bool "reclaim empty user page table pages" > - default y > - depends on ARCH_SUPPORTS_PT_RECLAIM && MMU && SMP > - select MMU_GATHER_RCU_TABLE_FREE > + def_bool y > + depends on 64BIT As discussed in the other thread, likely config PT_RECLAIM def_bool y depends on MMU_GATHER_RCU_TABLE_FREE && 64BIT Could be nice, and if possible even dropping the 64BIT limitation as well if there is no need to. -- Cheers David