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=1793788299; b=ItiFn2aqFXb27C2VWU+HJF+mZnY1yVlm+FlaDWct1ETNURz0hXUAA6/4mHHySlmrSVlD wyOz5xXtCmScig9vz8PTtXJ8mzrg8ubGBZg35P/YOUe/+0Vbt0yGjAEj9ClXxjcLmrwAU c5GvXYUrKgVnLC6S3AjBDMriHHAc5coqXv5ggaPick9ckj69PfmwJzyadFn19GW0AltUZ ft1wbc2u4XTvMPhEdrUFTpXaSFrhnLbWSvSaZVnreANqo5REsmocWPqqvrzDnt8Kb5BRt PUECaJ2KSkqrHBw9zahXg1dJEiMiEvbCNeeCjSFGAwtzDSzviB2YJ+H5lzg1Vagrw8Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793788299; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=L4FLZcP43DZnnGwB2Ff/3PX8AXs5+l2GsOb5VDmefFY=; b=Ww70xvoalcNCXxKbxwS+aaII5LUAbL00tzAKtZDi7Cng8+HnN90drzgZVYepgOrYSiEL Oc8wFl995M78Jw9+WyRPoIdVrinPYwWpBtglbUJfmNdLGZGc/k699B0nxjDjSHuWf5Icg LmJQxqoZLq8KgLMCr2lT9NPPqjzYD/tQ0B/L2p8X3/mE922+Tx3r3szDCbKf85O90voyC XHsvC4/92NXf0pS3FiPFBAq3UICPKA10WFWeAZoF5GIK+kIQugk/5rRFBALchKPhM/+2N ChqueeApnbgAuPdCCZZ/v6co4js9rE2SzxWFJoHo07VPsJ0mDBQuTcbz6cGfYPbH4rg== 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=BckKRnto; 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 25C73606A328 for ; Wed, 4 Nov 2026 10:31:38 +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=BckKRnto Received: by smtp.kernel.org (Postfix) with ESMTPSA id D75BA1F00A1E; Wed, 4 Nov 2026 10:31:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793788298; bh=L4FLZcP43DZnnGwB2Ff/3PX8AXs5+l2GsOb5VDmefFY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=BckKRntoBWtnIaO1wAT9iKwLdh7ctP/N2hyM2T7ImOR+lBQOkxttg3u2XtBw3EZTR VUUTzXly3EpovKme4CyI1X5JXbwUHb2Q8Q4gvEnwz8yZX1SOcF5cGF2WrZa9G3TToU 5DNAdHpqkJD8uGBH4AW0F7zmRNa7YRbeRsYD9QHZtYj+l3nrqyNurxVHkSutfMRY21 OKhsJtGUy0QDs4kdKisIwrBrUo+8tZyPoMi837Ex+eDS26Hfc5ubQhOvMw7JEh1m3K 1BnZ7mKnFMLNUoF1vS4NopGIf7mmixPEWyBQxeKqi6lQPqCoeSSpGoE3EJc4dS+dCf Ke8peo41Ws8eQ== Date: Wed, 4 Nov 2026 11:31:31 +0100 From: "Oscar Salvador (SUSE)" To: Muchun Song Cc: Oscar Salvador , Andrew Morton , Mike Rapoport , Qi Zheng , Lance Yang , James Houghton , David Hildenbrand , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 07/12] mm: hugetlb_vmemmap: simplify shared tail page handling Message-ID: References: <20261104023510.260766-1-songmuchun@bytedance.com> <20261104023510.260766-8-songmuchun@bytedance.com> X-Mailing-List: linux-kernel@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=us-ascii Content-Disposition: inline In-Reply-To: <20261104023510.260766-8-songmuchun@bytedance.com> On Wed, Nov 04, 2026 at 10:35:05AM +0800, Muchun Song wrote: > The remap walker currently carries a shared tail page selected by its > caller, even though the optimize and restore callbacks can derive the > same information from the folio being processed. This adds redundant > state to the walker and couples its interface to caller-side preparation. > > Derive the shared mapping state in the callbacks instead, keeping the > mapping policy with the PTE being processed and simplifying the remap > interface. > > No functional change intended. > > Signed-off-by: Muchun Song > Reviewed-by: Lance Yang > Reviewed-by: Qi Zheng > Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Oscar Salvador -- Oscar Salvador SUSE Labs