From nobody Sat Feb 7 05:57:17 2026 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4D267341AAF; Wed, 17 Dec 2025 09:47:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765964853; cv=none; b=hbA9Q4nxm2IhaB80xBaYN/0vAMjrskgItOoPhfO1hkCYFthBrmnEuILt2fSd3Z/xNGQ1LdW1L3I517W+hm8eGCK/bNVFd2zmCQyvNSRdaBOGSDr/ANHBUMlS6SbMpPyIoVQhKohPeX6VYoaqwOn8YZsxwH1dXLxG3yUMyMpXKFM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765964853; c=relaxed/simple; bh=9RDc6+mY/BOwjSpoEwGFWhPntxw3uW/Hv6MZvdDJ5eo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IZzhkxk68IFgFTdXkohAbcpjrD2Yy2o8YvuyzDMtdQUblNRQMzFj+anxVlmB6xUmxslQSZChWTQeSNlEf3iE02yMznzdxOjHQyaVJfEPaZWLghAe7A+RQ8miB5QmIbYEfrwav63AjB4qDLsR0k7NbYnH29e7ej5GJQXVzLRc2IM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Pyc1KpvA; arc=none smtp.client-ip=95.215.58.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Pyc1KpvA" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1765964849; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6yDfSie6tI+R/bkHsg8f30F7brlmJ878+dqsdcToXoQ=; b=Pyc1KpvAxk811HYK04xjZpyTzpEkJYxqqJmPoGGAQiXIyGUCHOz7UnqXrw4Idz7ei3/Hvn nKx4SWPSfqUG4f91J+BuNBSg1KCzxG0cBAC6q78EOJ3y5AH8vsj9RdwGKsDwh1k/3OGPBu +BEuL1tluj818rz3TGgaraPxgsFz7Rk= From: Qi Zheng To: will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, dev.jain@arm.com, akpm@linux-foundation.org, david@kernel.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 Subject: [PATCH v3 7/7] mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE Date: Wed, 17 Dec 2025 17:45:48 +0800 Message-ID: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Qi Zheng The PT_RECLAIM can work on all architectures that support MMU_GATHER_RCU_TABLE_FREE, so make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE. BTW, change PT_RECLAIM to be enabled by default, since nobody should want to turn it off. Signed-off-by: Qi Zheng Acked-by: David Hildenbrand (Red Hat) --- 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 80527299f859a..0d22da56a71b0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -331,7 +331,6 @@ 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 bd0ea5454af82..fc00b429b7129 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1447,14 +1447,9 @@ 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). =20 -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 MMU_GATHER_RCU_TABLE_FREE help Try to reclaim empty user page table pages in paths other than munmap and exit_mmap path. --=20 2.20.1