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 175ECC021A0 for ; Mon, 17 Feb 2025 04:04:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6C1A628002C; Sun, 16 Feb 2025 23:04:55 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 671AE28002A; Sun, 16 Feb 2025 23:04:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 538E328002C; Sun, 16 Feb 2025 23:04:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 36B7228002A for ; Sun, 16 Feb 2025 23:04:55 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id A4238141760 for ; Mon, 17 Feb 2025 04:04:54 +0000 (UTC) X-FDA: 83128095708.07.7C94CEB Received: from mail-ej1-f49.google.com (mail-ej1-f49.google.com [209.85.218.49]) by imf24.hostedemail.com (Postfix) with ESMTP id A6BA1180007 for ; Mon, 17 Feb 2025 04:04:52 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=b0Taswxd; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf24.hostedemail.com: domain of richard.weiyang@gmail.com designates 209.85.218.49 as permitted sender) smtp.mailfrom=richard.weiyang@gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1739765092; a=rsa-sha256; cv=none; b=fi0td1op1LwSabfkuQXH+T+GG19qp+F/0AHiU3axMwVUrwa9+cxzFd1E9Gtq/sldjHHlmY T0UuTjJ6hWXiIAv7gMh9ht52fGnkLk5UBbWbosyeFfAav3aOm8vX25vWxBOd4r7xTtR9Bs /JutwxOscJCrfG0DhXfK2ZYg8ypvnJw= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=b0Taswxd; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf24.hostedemail.com: domain of richard.weiyang@gmail.com designates 209.85.218.49 as permitted sender) smtp.mailfrom=richard.weiyang@gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1739765092; h=from:from:sender:reply-to: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=/V2mmoCanQT/pwcWtV0/o0PvfX4+qGd2AcVlqml8A+o=; b=LL0HFldj15cTU7KsmKubgoTIQFQLeidFDYcb1IX4I9pmiMIk1CQowN9RKLUT4+BqaeyVmM GFnw2Pn6kMDPDri/dJ8I+AAlCZTaFHMtZPLOks6xSXIEA19wub5vOpiv/9Xwx0qvZ69CfF 4vRaS0i9so3M2XockwaFRDwwBzffEDE= Received: by mail-ej1-f49.google.com with SMTP id a640c23a62f3a-abb79af88afso247407866b.1 for ; Sun, 16 Feb 2025 20:04:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1739765091; x=1740369891; darn=kvack.org; h=user-agent:in-reply-to:content-disposition:mime-version:references :reply-to:message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=/V2mmoCanQT/pwcWtV0/o0PvfX4+qGd2AcVlqml8A+o=; b=b0TaswxdkWv7WJcnlYPd/NyO7QW2sXXOe4EjQTnIO4+Eu+RjlYuNicrTMyGy4AEjqb fK0kkRdjArdSFptryxp3ES0TQfXKE+4mLW6cqfyLSiUSmK7xhZ/iWLcrjtFSe4+6WK0d cT+l/zRTEQ9ezq50rGAdSBuaXkOJDiGSTJGTdLuihZSvOhG7p2KAvgXXyyEMMtn0K/BL imRCajumY4dognsHFHowtW2YlLiAyJdqyAa73lxdCjMdtrb5+YiYLesXexPQG9CRtHKn bx36w1hs4DaokPbvksTwPW5rHFV6J3OU5paWjNcXyRxFudkeTUoMHY/H+JWa8ZkzPLqz kuhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739765091; x=1740369891; h=user-agent:in-reply-to:content-disposition:mime-version:references :reply-to:message-id:subject:cc:to:from:date:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=/V2mmoCanQT/pwcWtV0/o0PvfX4+qGd2AcVlqml8A+o=; b=W+BxqDnFWcJ6JCIps6w83ZlzCJJCBhU2a9lkAK7SBbhywqqzd8Mw/DHARlEcTBsQos 1iAPaB/XOtbJ+ERupAYqJW7Mpu4ezNKajRRYiZOGqFZIkROgAfwoBI2lVtA0gFYUM2PW 7BbXdi2lj0ZMB/F5tC3DtXO8qQhS2JP0WIGPqbcIlYDUKJASZnXfSTu+LqxpOhGccG56 Bzl3A4W1yNmg6EeV6MQHkCWQKTUgfGNv18VgEfHiq7efIJmT4BBOV2lRe6TfSfAL1VZO CBtrxnqBA1D/W7WMU0bj23niLN/cZehTkYkRXK525WifMMdPIOSevzz84f9s4twRqOqq gNxQ== X-Forwarded-Encrypted: i=1; AJvYcCXypxbveFnI/b/lYie8L98QQHbxLoDZW4F/qdd7oPmR5lT/249hr0EXdE3ubv0ihWc8x7Eb+6k/8g==@kvack.org X-Gm-Message-State: AOJu0YyTV0tuoBWZNAZdBVkGm+0CN7lTiaiLV8Kd1VDWs8Jpx3575pS7 2W3WgZikMl6huVBM1igc1XkOTxa8QdebBAS6z/hhkxPudXDZXu8i X-Gm-Gg: ASbGncup0DY2zdvU2oSeT7yxLsn8I9TjNWUmoyZ2y9xV+wNItEoPZCyh8NKsQrKrYps 4tn4Wvqj7dZPXhci/cYqTq3msvhIbAvjIrJ1+cehYWe7wzaQkqLEpMsniz1bn1UObTesZAkx66Q ZIS9qm+f0El1jOguTlEkuMGOM4gYuSirkkXQb2WgSwUAsz2ejRNmH5gkgcNXzi6r/q2g7owwBIb aC4tZYVncXP2DZF704AjvQGMudIl8fCMSsfthfdTV4vysctcewu+NxC+ljwkw0RLZSAtydmSIvA Ibfx2ugPT5u9Tt8= X-Google-Smtp-Source: AGHT+IGMLRPGsc1YpdO8muFNdeSP2zhH8Ioro7wmde7M2ghBjV9zkhB7Y03DXnpBI6WgZUsZLU2s/w== X-Received: by 2002:a17:907:2da0:b0:ab7:c4db:a044 with SMTP id a640c23a62f3a-abb70a7a647mr781879666b.8.1739765090766; Sun, 16 Feb 2025 20:04:50 -0800 (PST) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aba5323202dsm806661766b.6.2025.02.16.20.04.48 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 16 Feb 2025 20:04:49 -0800 (PST) Date: Mon, 17 Feb 2025 04:04:48 +0000 From: Wei Yang To: Mike Rapoport 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: <20250217040448.56xejbvsr2a73h4c@master> Reply-To: Wei Yang References: <20250206132754.2596694-1-rppt@kernel.org> <20250206132754.2596694-14-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250206132754.2596694-14-rppt@kernel.org> User-Agent: NeoMutt/20170113 (1.7.2) X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A6BA1180007 X-Stat-Signature: 1jz3ofa9jq36jezjpifgdutoda1wcaax X-Rspam-User: X-HE-Tag: 1739765092-497385 X-HE-Meta: U2FsdGVkX19+r/i1sAdpBisRIbi97LfOG2ig8fBafKmvzzkm19pHpCoz5xhXMEr8H3JdsAc0wzbfa+3FT3FBsLIsRCSbXj7ucNgeJWUouIfGJm0w9aRNTvXbw2vluPLug3Lgwv7UwIDRP0yNuhnAE+Fag0KhiMvEb9bN+wKtTpSGtyAtBuH3Rpr3dsFU6F0X8k9sIB117DWCR9tFiOdmJP4T8wiKCFGn+zgbJHv6dhZ1CQVJ0RbqmM6z5xegMwM1TvwsibYdvo+8GY2oU+Lv0Uue99nXmIzhiJgAVw2IC2DH/wyGClCmL1h1ZPbskOllO7A5/70Wi9cj9SlTFVBTaFOOEeeFQ8DgBZU6ZZuaEntfli82ULLmxsgmw7JfHOS6jUbeHgzpx01zWAyGbp5HKrxVRq/p9Ht9cuKK32FYpHRwNr0bEsBvxtA6ldchHvMDhTGl6Pqp5MFv3dVs0YAeGKXbp6l1RBfnQwa2zfqzN4GbhQ9J4eQBNBdjFB9scYdCFo1ursO4QRZVXo9Ye4jo3XZH0Z2A93mKGc7rcpofJjpAz2dFx8NBN+hnWutSr7aLA1HxULz5CU9bqRc0GtAF6cgZ0v8AOY95UxJI/u87+O+Tq1YyTqeFNwCoeNUeew4O3obU0TNQ8veVoO8PbFvgQuJ2dLTQ4JrdVHN9/7tmgh0Y6DICkuLBT78h3rFTgN2RmRMuV01fdyJ9Rq2hz01NJcQMV0ZD4WBuIUWBx+FuZ4KeoK/Vdpmwo/KAZcry3NW+uMCs6u1sD2YpdEzPaPpgSCXDrgU/w3jEaUNRazvWEOahuKdJoQTXuykc+KyNpqq+w3ottIMAprpv1fwYRhdZ378XTd3aH/oybRCUs74e5MUhxIQg+KGSW2S0KAgd0glSox1senQdWTGeSR5eYSJkS9Igt2TeVuPsST8RjwgBBcRccAGq1O4pZfWno0AZXQDSAn3ZBG/hQxkh0xm6nAx AfVlCExR 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 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 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 | ^~~~~~~~~~~~~~~~~~~~~~~~ >+#include >+#include > -- Wei Yang Help you, Help me