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 58A69C3ABBF for ; Tue, 6 May 2025 13:34:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5A0816B0089; Tue, 6 May 2025 09:34:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 54E896B008A; Tue, 6 May 2025 09:34:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4142F6B008C; Tue, 6 May 2025 09:34:52 -0400 (EDT) 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 24C976B0089 for ; Tue, 6 May 2025 09:34:52 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id AEB93C0240 for ; Tue, 6 May 2025 13:34:52 +0000 (UTC) X-FDA: 83412578424.23.C61A879 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf22.hostedemail.com (Postfix) with ESMTP id 03E5AC0010 for ; Tue, 6 May 2025 13:34:50 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZHYlge8t; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf22.hostedemail.com: domain of broonie@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=broonie@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1746538491; a=rsa-sha256; cv=none; b=zZ6DCLrDAXHQctYpNWDdiiQ3swrfLH6okOtDwP0VowpGKkYnNNikbAmIhyUFWmKvubilqt epsNwD8TSltXG0xrQY3/ZEMJLF5M2g14huatCW8qDow5RSRqBhdctG0gFdZuEKQjfEWXJf gBbxPPCJE2np34wYkLH5DFop14WFkHc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1746538491; 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=8TSz1OWm0B5U3QCt1Nt1q8Hqzz1qhQA6Q1C1IkoBljI=; b=LkzcLiXrxC0ucfpm6DoYW/ANE4lWQPxsmXVYLosRNZusJsCtTcodu2XFW/xcIMvHpvDRpI QfuvTaQ/DofAGGs/sdmymwuwGoxdtA2ROCCuRa5ZMZ4feMCbc9Cd5jkHDl+z7oPARbJYsW 4TAhChjld/gR94dSrOlx9Yh93smaTtk= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZHYlge8t; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf22.hostedemail.com: domain of broonie@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=broonie@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 4B9A9615F2; Tue, 6 May 2025 13:34:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 998EBC4CEF0; Tue, 6 May 2025 13:34:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746538490; bh=8TSz1OWm0B5U3QCt1Nt1q8Hqzz1qhQA6Q1C1IkoBljI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZHYlge8tiqB+KlH2m3iRRIlcW7oOd/GawTHhbnZ+dk0CxjR3mJWg0RE6AV/67UzCo /YZnGumJzlndLhFE2rAYRGtmADQWML+p9FRXUERZAcfAJVuZoRe9cpjYWZZgOw2891 ksLpNZ2Gv5QKZrNGK+ICKHjHIK/AWW4b0OVruveyOiEo+wUYz3MLrdGaNifobskq6p QTm7dCkHVd2CRO7tjJTmWEoTeqspOcvpZlQyaZBdsF40U2FoVEz6HNQySfvfTrZvSj ORTvxKVIYdyTiYt8bf1gdM+2y5W55ahX8Df/Te4i91ZlgARJ+YB8ibDtYg5uC3CoIu J1qxGaOU3VQJA== Date: Tue, 6 May 2025 22:34:44 +0900 From: Mark Brown To: Florent Revest Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, thiago.bauermann@linaro.org, jackmanb@google.com Subject: Re: [PATCH 0/4] mm: Avoid sharing high VMA flag bits Message-ID: References: <20250506095224.176085-1-revest@chromium.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="WfNXS5zD4YMjIjfy" Content-Disposition: inline In-Reply-To: <20250506095224.176085-1-revest@chromium.org> X-Cookie: Well begun is half done. X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 03E5AC0010 X-Stat-Signature: 43qqzh9fdijqzn6ff9sajtoq49pzugce X-Rspam-User: X-HE-Tag: 1746538490-493697 X-HE-Meta: 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 jUkCOmDB JJ+z0quDQwmlIfu7Z1pOOWJS5u90yCgGr4vKetHVTASI9BG0fgrtQDJiRxMQ7obn8ihdMg15f/8HwgLnJqKMU0qSB0IWvdb/NFXsBlKV7QfIdvbPCnpzNOvVHM7u0GvYq+xyyrF2tYCvyJamLtZc0N2/GHirmLN/fXy8YOn6qirJL1nRCSCJo6eUUaZKPk0t49bHc8TTuPp9gypZz0V/uybOwAtBh5SY6B9FFSMW9sXozjNQKm9dt4QSdNgAGlSOgv8W1rcLAmWSkSEX0cLJvVFHVRA9W7BPiyadQDbX9fXB8ptM4yGv0Yt+Fag== 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: --WfNXS5zD4YMjIjfy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, May 06, 2025 at 11:52:20AM +0200, Florent Revest wrote: > While staring at include/linux/mm.h, I was wondering why VM_UFFD_MINOR and > VM_SHADOW_STACK share the same bit on arm64. I think I gained enough confidence > now to call it a bug. Yes, it's a bug - it'll be an add/add conflict with those coming in via different trees. --WfNXS5zD4YMjIjfy Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmgaD/MACgkQJNaLcl1U h9C7Dgf9FVH1H/mNg1egXWX9AKNdUe4P0CABXFDY7Ba+WHdeijmIWGjt+SIVmg86 oECww6n5j8RUABEu5Rjt6gR9sV57kB54ytlT30XDu/WgjAXEk/qVSsKurhzcv2og 9o50N5VpiOxRQEH2SundwnJLdoe/B+4+/ONS+T3XZIxo0UGvIrf2ltoNiV3b5K9X 86d9rBpZoJyftPCJcskFBzzYSIgw+CTMnaINAxBE70V6Cn2vOsqdDsSiecHRV/jj V6HuFUh7oCGvxNf64s+CgWCKQYbuCcQVGtYU8s9D3KSIKsQ0ghtOpoGJxoGKq3Rc +ic+5Ul1ak/mfMfZvoBSp4FAjZeddg== =YB// -----END PGP SIGNATURE----- --WfNXS5zD4YMjIjfy--