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Mon, 29 Jun 2026 04:04:32 +0000 (GMT) Received: from [9.123.5.233] (unknown [9.123.5.233]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 29 Jun 2026 04:04:32 +0000 (GMT) Message-ID: Date: Mon, 29 Jun 2026 09:34:31 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/12] arm64: Add HOTPLUG_PARALLEL support for secondary CPUs To: Jinjie Ruan , catalin.marinas@arm.com, will@kernel.org, tsbogend@alpha.franken.de, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, kees@kernel.org, nathan@kernel.org, linusw@kernel.org, ojeda@kernel.org, david.kaplan@amd.com, lukas.bulwahn@redhat.com, ryan.roberts@arm.com, maz@kernel.org, timothy.hayes@arm.com, lpieralisi@kernel.org, thuth@redhat.com, menglong8.dong@gmail.com, oupton@kernel.org, yeoreum.yun@arm.com, miko.lenczewski@arm.com, broonie@kernel.org, kevin.brodsky@arm.com, james.clark@linaro.org, yangyicong@hisilicon.com, tabba@google.com, osandov@fb.com, arnd@arndb.de, anshuman.khandual@arm.com, david@kernel.org, akpm@linux-foundation.org, ljs@kernel.org, dev.jain@arm.com, yang@os.amperecomputing.com, chaitanyas.prakash@arm.com, kprateek.nayak@amd.com, chenl311@chinatelecom.cn, thorsten.blum@linux.dev, chang.seok.bae@intel.com, tim.c.chen@linux.intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org References: <20260624092537.2916971-1-ruanjinjie@huawei.com> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: <20260624092537.2916971-1-ruanjinjie@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=a4kAM0SF c=1 sm=1 tr=0 ts=6a41eede cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=UTcEnaM7yftER99u_cAA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 X-Proofpoint-ORIG-GUID: brKsWx2Mn5cq22CSo7JfDcXigXZ8mboI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjI5MDAyOSBTYWx0ZWRfX4wuecVrq54Iy 09MuLAjOrz4oMF0mdeWXs+yPEw2RHZ5MEGeCZZQ7PFIZ2Q8tULLjM1jh2pAcB5A1x/txgTR5z2H QSarFRBtoBx1X2qhnmIT+ORW4AiRaEuNDfc0b5Ms7QwRNXFNSOs5xOZCLmsrFtQlCOJSsAoX0Es g3pLBjXT9zh22aSvrbk5nRCiXnLAyJEH3tq/6+hLw/6I6v4mNVjma2epz7cuMgHeoS8KcYkxA2t ju97JqZHRkjH1cHpkOUumvZ3ktTgUyRWdrxxvz9qrzkNX9TeQVS+liYC+4JvYJHv2OD/tqOR4iU +pnviHtig/I4k8R+j7b+rY1gPdjNP7incw4E2f6UxpQodqFJd16k4/OC0Tn/1+4UEbqkZdSO+1U rD6UQ6VzaLh4e3NICIJyfuiE9em7wPlXa/nDZkdlYqSQtkOXAZFGJyK8eoXXC173ga82W2waYLx N24t8mv2YzipMjc8t3g== X-Proofpoint-GUID: r39Yr-mCbX02DwkQlbof5NCflo21fNWH X-Proofpoint-Spam-Info: AW1haW4tMjYwNjI5MDAyOSBTYWx0ZWRfX0dtp8M6P3xSX Km3HXGHO8viEhGwrt2g/J/kRq7WP4XqsyDiGB+S0dVDp2rKp8y4yYwpRenpX7AIhH324AS+c2+J ZvjCVjjjFhuPZCJJeyTNN2qdy6LcCWY= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-29_01,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 bulkscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 priorityscore=1501 adultscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606290029 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260628_210608_253569_32D29C41 X-CRM114-Status: GOOD ( 13.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/24/26 2:55 PM, Jinjie Ruan wrote: > Support for parallel secondary CPU bringup is already utilized by x86, > MIPS, and RISC-V. This patch brings this capability to the arm64 > architecture. > > Introduce CONFIG_HOTPLUG_PARALLEL_SMT to avoid primary SMT threads > to boot first constraint. > > And add a 'cpu' parameter to update_cpu_boot_status() to allow updating > the boot status at a per-CPU granularity during parallel bringup. > > Rework the global `secondary_data` and `__early_cpu_boot_status` accessed > during early boot into per-CPU arrays to allow secondary CPUs to boot > in parallel. > Shouldn't this be called CONFIG_BRINGUP_PARALLEL instead? Hotplug usually means disable/enable CPU at runtime.