From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 85F9A4B8276 for ; Fri, 9 Oct 2026 10:46:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791542783; cv=none; b=ZZ10ncRLutv+QXcnQoNsf5YF1rODZlme/1Mf5fBt9JuJ7i9mYezfJ2KpZOUNU+aS0EkdxQln746OQ5Vq/JRdbqL807VZ/GefLDVQGxyjJKUOc1EqC551uhVi9DBHgEr+ERzXNQsU1sc6ghqZdf0CLeepzotBmOqNOhfhYhbeunU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791542783; c=relaxed/simple; bh=BYKk14i+Ric67oMf67XxdeSpGxsihD9SE7KUdWZh6Vg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ERyEj2Hhc0q4u/X7dSHjG9plJsonoF+kvFdHDNqkC6SsYsCyUawHhOpDBvXu9ZBIxPA527zeql9XoM2YR09m7gBzMtq9ILY4nk2bII/+09O6QB0exv4AlEy7hO5FiaDO2jnzLBWrbtyKgqUifXhLwJ7Dt4+xQ9FyqGeUcgeyaeU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=mknrkR7B; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="mknrkR7B" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=BYKk14i+Ric67oMf67XxdeSpGxsihD9SE7KUdWZh6Vg=; b=mknrkR7BD/ZKBW5JW+cmSdxrrV 71AG7GjkVVfTdgkaliOTbf5GuGl0N0g6Bi4UZI31ZdefHNwPbGNUS0TQrL6IECZy5g8bsS3eLC6Ag 5OazW5Zt0mQvHeaOJYyl0Mws6td84h5y2G74m008zJHX16Z2Z8LY+ZJaR6R/KuLdtCQQz4cXCnuSF oZfB0BIST7eItX87MRH0FtueJbbXtRa4Mqng4+1zcb07KymSuI6wub3fHhHn9pOIUcryEwnsex3ZU w2Z/aLwvGk6SLjvw5JXDtpkJPAVviDmsUCbtcz9JlBGFyJqgKu8PW8ERiy3nGOP/+BWbcPqDOah3T AwwVtoCg==; Received: from [54.239.6.187] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1xF87A-0000000EA7D-3kMe; Fri, 09 Oct 2026 10:46:12 +0000 Message-ID: <7ba9bf65e714a17657252a7fb267928f8215bc06.camel@infradead.org> Subject: Re: [PATCH v2 03/23] cpu/hotplug: Avoid busy-polling on archs where cpu_relax() is a no-op From: David Woodhouse To: Will Deacon , linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Ben Horgan , =?UTF-8?Q?=C8=98tefania?= Ion , Catalin Marinas , Pankaj Patil , Borislav Petkov , Lorenzo Pieralisi , Jinjie Ruan , Mark Rutland , Tarun Sahu , Fuad Tabba , Peter Zijlstra , Marc Zyngier Date: Fri, 09 Oct 2026 11:46:11 +0100 In-Reply-To: <20261009100738.31288-4-will@kernel.org> References: <20261009100738.31288-1-will@kernel.org> <20261009100738.31288-4-will@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-8o2NxbKH6soaRpx1/pCP" User-Agent: Evolution 3.62.0-0ubuntu1~ppa1~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-8o2NxbKH6soaRpx1/pCP Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-10-09 at 11:07 +0100, Will Deacon wrote: > Change cpuhp_ap_sync_alive() to poll using atomic_cond_read_relaxed() relaxed. ... > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 atomic_cond_read_acquire(st, VAL = =3D=3D SYNC_STATE_SHOULD_ONLINE); acquire. --=-8o2NxbKH6soaRpx1/pCP Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE 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