From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.24 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794198418; b=qC4pZaIyykx+W5hr6kuZT6XGgq0PolkjJ7NbHLEQ9jd8evrNCYDgAHpIJ9r/Bow4CXJX NuzChVsMJ7fV1ESPqnxP1rzidXFW0Xi/BPM8JGdm2lMXuCezaMKffnmHP9Te2zXh4fSyW cnmOiaYHShbHXIvFab9KMXdh3gVzJat7SRhVohA8ZiIJxJ/q0yNyt1TM9dpZn3m81cwZW VHrEkcAUaydsE0zbhEESBi/VHMBzEhVIb1U7+aG+koyOAhB47LjqhhqfqJPiNCLcY0GBl QLUkETlnXF5ak2xFmoSV1mK5hROTx5UASogu1x0Z6bNpiP2fgFL2UnHIBEwI2uenlDg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794198418; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=0SVPjoU02fufplg6UCU1lm8OR+hTiBw+cX99Xog7iH4=; b=JlXHxYIOxV4XU6TazsOUlud4AnoHTon9+JEhbci/iBQ5HdYEy2TJZbsnFg1SFnwKBjvC b3GkgKwAnY9J1I+RFRyKlQv7RMPwdZFs9O+UzpYrt00WPoRUFMBWvzqCnwM1CwSsrVgsc dI5cnHn1voWP6be4AarYVoCqb7AnAuscfhKipnt54Th9GuEPjbYDMwthjzsbegAdysMR4 Y6098T2K37ZsaiCV73BMOlDb5Zfsr1eRzTXT2+1dC5qSsLZTcxis51p0RNhHadQf6lsak M76K8qSvQtDcpTc/TsSMmyBuoO7RujmsQzc7xmByRm9lxP7lGkfVUimaLo4f3QZHixw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b="u/Gx8aBg"; arc=none smtp.remote-ip=95.215.58.24 Received: from mta1.migadu.com (out-24.mta1.migadu.com [95.215.58.24]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2017B606A322 for ; Mon, 9 Nov 2026 04:26:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 2017B606A322 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, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=u/Gx8aBg X-Envelope-To: linux-s390@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=0SVPjoU02fufplg6UCU1lm8OR+hTiBw+cX99Xog7iH4=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794198415; v=1; x=1794803215; b=u/Gx8aBgnHUkuXVi2+BQTYcTDxH8zFUmAR/TVFAy46WVUw8Lm9l8nbKAhmANIRo5EFy9lMew uqhCIgOleT3njpCY3/Dv7cMDqi4bwx/iXr8FHzCyP+4xEO4rb2Uae+SFRzrmb+HNtjjXKcUWcSf Benz8ZX3QBGriDvnxTFBIbfA= X-Envelope-To: linux-s390@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id b6a087d0e32380d8; Mon, 09 Nov 2026 04:26:54 +0000 X-Mizu-Trace-ID: b6a087d0e32380d8 X-Migadu-Flow: FLOW_OUT From: Lance Yang To: songmuchun@bytedance.com Cc: david@kernel.org, maddy@linux.ibm.com, rppt@kernel.org, akpm@linux-foundation.org, lance.yang@linux.dev, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, osalvador@suse.de, qi.zheng@linux.dev, muchun.song@linux.dev, chenhuacai@kernel.org, kernel@xen0n.name, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, loongarch@lists.linux.dev, linux-s390@vger.kernel.org Subject: Re: [PATCH v3 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize() Date: Mon, 9 Nov 2026 12:26:47 +0800 Message-ID: <20261109042647.37323-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261107043122.25650-3-songmuchun@bytedance.com> References: <20261107043122.25650-3-songmuchun@bytedance.com> X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Sat, Nov 07, 2026 at 12:31:19PM +0800, Muchun Song wrote: >Whether the optimized mapping can be used is now decided in the >architecture-specific vmemmap_populate() path. When PowerPC has to fall >back, such as on Hash MMU, it can disable optimization for the populated >vmemmap range there. > >Add section_vmemmap_optimization_disable() to centralize this fallback, >use it in the Hash MMU path, and drop the radix-specific >vmemmap_can_optimize() override. > >Signed-off-by: Muchun Song >--- LGTM, feel free to add: Reviewed-by: Lance Yang