From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793986129; b=43B2NYmSeUGIuTAJHg6Cj2TiHOrqouhJBgpMyncEzN/L/NCxbxoABU9tQ1kwdz4cBO2i Xs1xF6GjeSX7+18LdsZ1URKhV2H2b9a9bGz2oHWbU3ITIDxF0ntfT3rt6Zg70dFJP0Ley WdAHPmHOUV0YrBFUwdivfYMZRXcq5n4NfVCZ0vpnoMmmBBmUzEJ01Q1+ufHWGSKBaz1CL LlxQZ5aCIE2WCUxK/tNTlaeaPVuFiCLi87zDh2JFpkYOB/0wYHZroL9RAJtha+IvR2MjH wM4FAIyNjnt9R5kFK1O/K/bDzqzXyNnhy9oXuNO8F6HPC3CmmgMYa7siHRLUKCZ0bXA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793986129; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=DwummoyOz6Zu5ArmWTq2hTkRLeoSlw+73xpteqEKGJg=; b=Jin1KSMYWaz0uyVtd4YWw01mlI5jupYMRYUCoZp0IPw4bqwIyohY71lyaCgmboR4pkyB pD7Lj2wFLx3bJVpnkr1ohFucTyJ/SmSiQ10e5KH7BksrC3KN8Ny1VrQg5J0nszFVnAZgB KhP0WdbEdiIUnRqXoGEI/RTmABWwRCtaU/ydfjE9beJfQBhyGytN5xtjW9csMtwl4owiZ 3mxxQg/dLdW5RfGlqMIa1DVLsmxj67aPkzdSsj9YKYHERcYwF4aTiNu131Qbr/4CnOftZ Hksp3xeePRZHNG3I97bBJJIIPXzEGZsb3Xsinvq5FWVGmOkp6bdlF8e7fBNB+TzX1Sw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=olruZO8D; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8076D606A329 for ; Fri, 6 Nov 2026 17:28:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=olruZO8D Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5D341F0089F; Fri, 6 Nov 2026 17:28:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793986129; bh=DwummoyOz6Zu5ArmWTq2hTkRLeoSlw+73xpteqEKGJg=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=olruZO8DutDTtKygsXJFhMvNuwQPpVJTXA7dFyH6c4lCBF5C6/XL4I7n/tUHPl4R1 8gjUFQ+SM2mugOHYv3xE7id9qxCooP2X/YF1TvVlIJ+Z0CR74opXBM+2awsWlNfuQs KNPC6wWwnljlkA8GOhx2fe/Uzw7Xq5xuRooe7VWzuGbXo+5yHHTQIgnCDhH9M+RORB RHlTqhMahCAP5FI0X8mplO7pKWn+MUL75a18Fh2N/znl66HVGmqN3cDPahuGLwg6YD fP3mNORyR5pQuVn+sMYQFJmBkx9fMgaL3BmELPJJSC+obd4xFyxfcwwfAyNW3S5i+x 9d+5btNF/qEyA== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH] s390/mm: Allow hugepage migration for s390 Reply-To: sashiko-reviews@lists.linux.dev To: "Gerald Schaefer" , linux-s390 Cc: "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" In-Reply-To: <20261106170844.4079771-1-gerald.schaefer@linux.ibm.com> References: <20261106170844.4079771-1-gerald.schaefer@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 06 Nov 2026 17:28:48 +0000 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > After hugetlbfs PTE_MARKER support for s390 introduced region-third > and segment table swap entries, it is possible to also allow hugepage > migration for s390. >=20 > This fixes the problem that hugetlbfs pages could not be allocated > from ZONE_MOVABLE memory, which is often used in combination with > memory hotplug. Therefore, without support for hugepage migration, > a large portion of system memory could be unavailable for hugetlbfs > page allocations. >=20 > Besides selecting ARCH_ENABLE_HUGEPAGE_MIGRATION, this only requires > definition of arch_hugetlb_migration_supported(), which can make use > of the existing arch_hugetlb_valid_size() function, similar to other > architectures. >=20 > Signed-off-by: Gerald Schaefer Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261106170844.4079= 771-1-gerald.schaefer@linux.ibm.com?part=3D1