From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 06ED3414A0A for ; Fri, 25 Sep 2026 20:22:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790367763; cv=none; b=X7psTLQS8pQXIhFN3ecvAO0uPRIyAxJjhzebvc7Kx98rN9Bt/zzJIoP9Tmm8e2TPN0Wtb6RP/u70hhAQG4LEO8jyY8CSRIW5IB0Wd5D40gIvSruf1lTLpQvf6Z0SghUlXAATTTzQ4qbk+EHrVdGGUzYiebNKTMrdVpEuobuaAPU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790367763; c=relaxed/simple; bh=5YaHpOFzWMjiCYca9HBIxRiXhchI4YdW0CuY7VOYceM=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=kd/JNKmbe2SwvX/PitCvx2F2fQ+igE3APfLbJWWnt3bVtncxIUkIfveXEAU+4YDVFyAjTFgrEQdKuLAFUOkh2bCzZ2/sRQPrbCEy/NU8OUtpCx6bC/YklSvLBbwsYBuNdVyr05DxXTqXQWs2l7mgUGe7OLwYfXXGiezKgEor3Bc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=n8EDgw1/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="n8EDgw1/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 565C61F000FF; Fri, 25 Sep 2026 20:22:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790367761; bh=5YaHpOFzWMjiCYca9HBIxRiXhchI4YdW0CuY7VOYceM=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=n8EDgw1/3n/81CboKzVVynsof+ODmU8gf2lelKIUHxfa1D9oRF2rd79qfRGIia0Pv 8Vo+iH+p2XZiMD3vCAG5773A7GnjRjwNqbyBC74lzjsl0FAt6ZZrr55qpLImWQgtlX 4rskpHXwPeekG2WF5GwGz147ejVmJttAYNkCNV4dJ/h4mf6o8dNDr0me5Ze/uQ3mNq t3/VbtZJ0yq2cQqjFELMiRnbVeKLjtmfmDRGJllHtozScxNA1VC3jonRbGmZFpTYX8 8U8uagy1hlVmfO11EtMdSzWHoq6OVhoicnlkheWdpIskhWYzV8WrAL2xPzGc3G8rh5 kHEP3vNffxUSQ== From: sashiko-bot@kernel.org Subject: Re: [PATCH v5 06/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64 Reply-To: sashiko-reviews@lists.linux.dev To: =?utf-8?b?TG9yZW56byBTdG9ha2VzIChBUk0p?= Cc: linux-s390@vger.kernel.org, "Heiko Carstens" , "Alexander Gordeev" , "Vasily Gorbik" , "Christian Borntraeger" In-Reply-To: <20260925-rcu-pagetable-freeing-v5-6-31e91065fea4@kernel.org> References: <20260925-rcu-pagetable-freeing-v5-0-31e91065fea4@kernel.org> <20260925-rcu-pagetable-freeing-v5-6-31e91065fea4@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 25 Sep 2026 20:22:40 +0000 Message-Id: <20260925202241.565C61F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: > Commit 4a0100f7546f ("sparc64: use RCU page table freeing") enabled > CONFIG_MMU_GATHER_RCU_TABLE_FREE for SMP sparc64 architectures, expressly > for GUP-fast page table walkers. >=20 > Naturally, UP systems do not have to worry about concurrent GUP fast > operations. >=20 > However, CONFIG_PREEMPT_RCU is also available even on a UP system, so a > future pure-RCU page table walker requires MMU_GATHER_RCU_TABLE_FREE to be > enabled on UP, even if concurrent GUP fast is not possible there. >=20 > To enable future pure-RCU page table walkers, enable > MMU_GATHER_RCU_TABLE_FREE unconditionally. >=20 > With this change, it is no longer necessary to have !CONFIG_SMP > pgtable_free_tlb(), so also remove this now dead code. >=20 > This forms part of an overall effort to switch every architecture to this > mode. >=20 > Acked-by: Kiryl Shutsemau (Meta) > Tested-by: Lance Yang > Acked-by: Lance Yang > Signed-off-by: Lorenzo Stoakes (ARM) Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260925-rcu-pageta= ble-freeing-v5-0-31e91065fea4@kernel.org?part=3D6