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 4DFE7560AB1 for ; Tue, 22 Sep 2026 15:47:53 +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=1790092077; cv=none; b=UCRxMc8sqNo9nG3e7z+ywV3Zys07vUB4QDw7zsFjtXpGNA8TwCi4ZtJxt6iHAdRZyeBQ/WUq+V9YLJYmLm9J/fMG8gxi/oqN3lBVyWkkkrPgM4JXf8BH4QKnU4jJHoulSncffZfslOjYf/+V2YKuk2/duCa+fj50XGbFISX13q8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790092077; c=relaxed/simple; bh=d1t/jxrZZrqy2lG4zP/CQBW3YnAG2lniHyuDOnhHwlg=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=DeklWqE7HR43buwfswuxyAGsmkLUClxtZKLpfQ6Bjx51Q2xNseFHUiqz9WiaNbskIQ5lNbdtU8Acaj3ytzM8y3K428egh/gmD3cJzRGPveqxMzjuiXlPPHVN3X+r+wkzPDmP1wFlHGVaJlycQ3sWGgbt5I2donEF/+GvquJ7Lk4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WuytfHd1; 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="WuytfHd1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EEEC81F000FF; Tue, 22 Sep 2026 15:47:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790092072; bh=d1t/jxrZZrqy2lG4zP/CQBW3YnAG2lniHyuDOnhHwlg=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=WuytfHd1UWrCvpOEncjb9icZQtUFVuxOE9Oe86tszxDdyMpHClZJAOeijrbfJjy4T mwGHEn4Uiny1KS7gZYWBCXIhIu4S6NQHQwKja1zdcff0frkTo9TkJfRk77LpF0naK/ G/UcB9CaamJkl6YD12mkxZVHek7VNUXQPi4f6/iguw6nGnM3XvWqjegB/6i81zd63D QZeKuebtoRbFcJHLYcBzM0d6CmIgAFdagYceNFzm2ApgqheKdcS4NMhwx7toivSK/M yVL3cOsaEEQgddheCqbwqkC5rEmw5dF7ladC4Zg77ljWX1pni6H9elttxwZAnrs0Ay nVXILNqDWCV+Q== From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 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, "Vasily Gorbik" , "Christian Borntraeger" , "Alexander Gordeev" , "Heiko Carstens" In-Reply-To: <20260922-rcu-pagetable-freeing-v4-6-fe1ad1f1e303@kernel.org> References: <20260922-rcu-pagetable-freeing-v4-0-fe1ad1f1e303@kernel.org> <20260922-rcu-pagetable-freeing-v4-6-fe1ad1f1e303@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 22 Sep 2026 15:47:51 +0000 Message-Id: <20260922154751.EEEC81F000FF@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) > 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/20260922-rcu-pageta= ble-freeing-v4-0-fe1ad1f1e303@kernel.org?part=3D6