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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F144C021AA for ; Wed, 19 Feb 2025 07:25:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 160552801FF; Wed, 19 Feb 2025 02:25:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E9312801F6; Wed, 19 Feb 2025 02:25:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EA6FA2801FF; Wed, 19 Feb 2025 02:25:46 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id C9C962801F6 for ; Wed, 19 Feb 2025 02:25:46 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 7D3241C8253 for ; Wed, 19 Feb 2025 07:25:46 +0000 (UTC) X-FDA: 83135859492.12.3615973 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf28.hostedemail.com (Postfix) with ESMTP id CA4DFC0002 for ; Wed, 19 Feb 2025 07:25:44 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=Jo0MN+L4; spf=pass (imf28.hostedemail.com: domain of rppt@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1739949944; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=8VZ4jL8diAc1EN7dg417QGXOWLpNluAlP2CUguqhcio=; b=gVtzm3cy8Dc+vv3znhQf9vzl5Nb52YkrstRmghMWilfZUoyJLMLAbRWsDfCkbT6QwOn5Vf xSAt1NYN0bgmRpFCj8GV5lp2PQ8fUy8BT7mSZEaXYJqA/pFybDoOjB4Ga+6CrBvgnCn+oN 1Ef56iNORqZj+anwbm0+ImGOPHlusEk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1739949944; a=rsa-sha256; cv=none; b=No4iwRY2TvxFUDwb1qO7NaRENcZmt/K8AxHCL1d0HuIgupbLRigwIznXLe+BVTydG0IQkS Few1Sj/PYSGXR9AaILCZkY4KGzUcR1JR/RCR00SnocjxBElX112kZD7HQLlH15qFNqNCmN FdARlZLm1nU18Sn0TYNBhXeIZPMzryU= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=Jo0MN+L4; spf=pass (imf28.hostedemail.com: domain of rppt@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 49C5BA41F32; Wed, 19 Feb 2025 07:23:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25288C4CED1; Wed, 19 Feb 2025 07:25:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739949943; bh=mn7g0i0MWinLv2YGo+kZxHpbfVUa4TgH6wIWEUwX83A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Jo0MN+L40nZsA1Z3XLmqtTAFU4+nInYDLglMHXNfS2AWgOzeetC9vn00TVjVV+H9+ rQaOBtcGPzPXGVyyTiFcCpL/nBV8pOM8Q4gmV4co22EBNknyhAhIQ5IzurwH1xZs5D 9ZupQiXqdfdhBvy4JD5VrKUeuKr1eVOMSSkdgtpySL+EufzrfLjrRGqbFNvu3nHa6B /b5W+Y0ntMGSBuAk5O+mNwS70ivu6sfNCZi3UJ8fCaFpIZ1/CRE0Cn1aAnZq16m/Q5 Um3231KPD8ZPih0fAIySoNxdGrfA0cv8JPQSfDj/hyxBae0+mQMSkcmUV9eOwlWzAf EzSsDgPrKpVQQ== Date: Wed, 19 Feb 2025 09:25:23 +0200 From: Mike Rapoport To: Wei Yang Cc: linux-kernel@vger.kernel.org, Alexander Graf , Andrew Morton , Andy Lutomirski , Anthony Yznaga , Arnd Bergmann , Ashish Kalra , Benjamin Herrenschmidt , Borislav Petkov , Catalin Marinas , Dave Hansen , David Woodhouse , Eric Biederman , Ingo Molnar , James Gowans , Jonathan Corbet , Krzysztof Kozlowski , Mark Rutland , Paolo Bonzini , Pasha Tatashin , "H. Peter Anvin" , Peter Zijlstra , Pratyush Yadav , Rob Herring , Rob Herring , Saravana Kannan , Stanislav Kinsburskii , Steven Rostedt , Thomas Gleixner , Tom Lendacky , Usama Arif , Will Deacon , devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [PATCH v4 13/14] memblock: Add KHO support for reserve_mem Message-ID: References: <20250206132754.2596694-1-rppt@kernel.org> <20250206132754.2596694-14-rppt@kernel.org> <20250217040448.56xejbvsr2a73h4c@master> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250217040448.56xejbvsr2a73h4c@master> X-Rspam-User: X-Rspamd-Queue-Id: CA4DFC0002 X-Rspamd-Server: rspam07 X-Stat-Signature: 79kjycd1h6g1a8sh64eote83hm3bedqg X-HE-Tag: 1739949944-903572 X-HE-Meta: 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 0lyeMcUR jVIx/CTjLnOdCtFw7zX9EXkQ/yn+xPgLAPMztvxiduvSuc2o1W2suQml90F7cD6w/y6qoCm+Fn37JcryNhyLtBFCR8fEp+n51bidSkEbPN7dZmFENfrGbb0x1ERPzQFRFz0Oo35ey+XXT5kmzQ3iu5gMwEnmNlRAy1d5bpYQS+D67CYM0D2y0BgrPvhklILgec0hrkKMsXjBGC1+UoRPQN0SPLE8QrbsEzevsarLYt0oknAMXKxEGIEaOQQOafcVuyApqgaVTO+JGUlW3VlBOdI16wwjZ5lX9UQOUzYv2x5yGO9QE7y4YQmPOawWTLxFsIPmcx9g6Ulye9QM17HiLXElMznvd1viNQU7Jo+iM1pno7LdZvnQ1cb5OooK+5I1mJ6/nGJ4vh7c761GH9cZAmxFp79QfULuHhiyhGbXYvhyYVH0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Feb 17, 2025 at 04:04:48AM +0000, Wei Yang wrote: > On Thu, Feb 06, 2025 at 03:27:53PM +0200, Mike Rapoport wrote: > >From: Alexander Graf > > > >Linux has recently gained support for "reserve_mem": A mechanism to > >allocate a region of memory early enough in boot that we can cross our > >fingers and hope it stays at the same location during most boots, so we > >can store for example ftrace buffers into it. > > > >Thanks to KASLR, we can never be really sure that "reserve_mem" > >allocations are static across kexec. Let's teach it KHO awareness so > >that it serializes its reservations on kexec exit and deserializes them > >again on boot, preserving the exact same mapping across kexec. > > > >This is an example user for KHO in the KHO patch set to ensure we have > >at least one (not very controversial) user in the tree before extending > >KHO's use to more subsystems. > > > >Signed-off-by: Alexander Graf > >Co-developed-by: Mike Rapoport (Microsoft) > >Signed-off-by: Mike Rapoport (Microsoft) > >--- > > mm/memblock.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 131 insertions(+) > > > >diff --git a/mm/memblock.c b/mm/memblock.c > >index 84df96efca62..fdb08b60efc1 100644 > >--- a/mm/memblock.c > >+++ b/mm/memblock.c > >@@ -16,6 +16,9 @@ > > #include > > #include > > #include > >+#include > > Looks this one breaks the memblock test in tools/testing/memblock. > > memblock.c:19:10: fatal error: linux/kexec_handover.h: No such file or directory > 19 | #include > | ^~~~~~~~~~~~~~~~~~~~~~~~ Thanks, will fix. > >+#include > >+#include > > > > -- > Wei Yang > Help you, Help me -- Sincerely yours, Mike.