From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 50E23EA811C for ; Tue, 10 Feb 2026 14:00:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: Message-ID:Date:References:In-Reply-To:Subject:Cc:To:From:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Y4XVuf7fFgdxotUQ4dcsKJCk8Cgp4ZE7n0aGFDw1tvc=; b=lHGCDbV0Iegqd1DjPEVTy/L6VX /A9v4jC1qSwNda9L9BOxY4MD9RDB25QpRi4Od/K9XYwgMv9KPhBIt6lJFTrw/Z+ttesXQhpUasYrj QD51Re49oTX/srsK6NHWu72mcTJCq1op7twMOPfot/USh3aE0a1CJTXr4OgK6opgOre6+WYw4NPkA JbuQ99VfYHSE0nI0l3VLEsbeOVmK2JWbLPuKIz+LFS6zQBfBMHX0Q3U5W+vGxBrti3sble1YBHNdI ezhxC44PHRq26XVDLrmBDEVqEQwmaAzAgzqGHni7nfCSrNKeHBULpl+PMLD7Eye67DYuSP/RAMajB E3aY3AFA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vpoI2-0000000H1Ox-10tV; Tue, 10 Feb 2026 14:00:30 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vpoHy-0000000H1OX-2lPg for kexec@lists.infradead.org; Tue, 10 Feb 2026 14:00:28 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 03D5344285; Tue, 10 Feb 2026 14:00:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2964CC116C6; Tue, 10 Feb 2026 14:00:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770732025; bh=Qw/RiTLGCC4XlReL7wouz9nXIOGMjkMZx2I4aimv43c=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=PaeJ5RittgcFyauGs4iFTI03D8aARwFnljv02mb/OI32cyBI880Z0Ao7pV1jeABQD qPJaD63vKD/fQ30QyRvb9cIgbK+IKhGUOd0OAq1rT4luW3hdj+DJpKIEbOBsLumYug 2h/alC4i+oy8qxiZoguwXiJZL82N8Ac2i9ERsPk3wlncH01qZjgWXY2l6Cnuw5hBwH nQbj/jZCWMmiiMt7aw44/RyA60jSugr/IJsjhVnJ5MnVJNDmaJj/AfeN1w86NttJqm FRnKfSt/5eF6xGW5FWxFoyEbnEshogxwgeZKSNjcEE+mTk0pHdYV5PQVpTZyjAHtSv z1qVL+7jaNHQQ== From: Pratyush Yadav To: Pratyush Yadav Cc: Michal Clapinski , Evangelos Petrongonas , Pasha Tatashin , Mike Rapoport , Alexander Graf , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: [PATCH v2] kho: add support for deferred struct page init In-Reply-To: <2vxzecmssnxx.fsf@kernel.org> (Pratyush Yadav's message of "Tue, 10 Feb 2026 14:55:22 +0100") References: <20260210130418.297153-1-mclapinski@google.com> <2vxzecmssnxx.fsf@kernel.org> Date: Tue, 10 Feb 2026 15:00:22 +0100 Message-ID: <2vxza4xgsnpl.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260210_060026_719077_E6F9BB89 X-CRM114-Status: GOOD ( 11.51 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On Tue, Feb 10 2026, Pratyush Yadav wrote: > On Tue, Feb 10 2026, Michal Clapinski wrote: > >> When `CONFIG_DEFERRED_STRUCT_PAGE_INIT` is enabled, struct page >> initialization is deferred to parallel kthreads that run later >> in the boot process. >> >> During KHO restoration, `deserialize_bitmap()` writes metadata for >> each preserved memory region. However, if the struct page has not been >> initialized, this write targets uninitialized memory, potentially >> leading to errors like: >> ``` >> BUG: unable to handle page fault for address: ... >> ``` >> >> Fix this by introducing `kho_get_preserved_page()`, which ensures >> all struct pages in a preserved region are initialized by calling >> `init_deferred_page()` which is a no-op when deferred init is disabled >> or when the struct page is already initialized. >> >> Signed-off-by: Evangelos Petrongonas >> Signed-off-by: Michal Clapinski > > Reviewed-by: Pratyush Yadav (Google) Wait. I just noticed that Michal took authorship of the patch. I talked to him and he said that was by mistake. Andrew, can you please give the authorship to Evangelos when you queue the patch? -- Regards, Pratyush Yadav