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Mon, 08 Nov 2021 20:43:11 -0500 X-MC-Unique: oFKyZnhZOM2q1dbJgZ4mKA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3DA42802C91; Tue, 9 Nov 2021 01:43:09 +0000 (UTC) Received: from [10.22.16.6] (unknown [10.22.16.6]) by smtp.corp.redhat.com (Postfix) with ESMTP id 93D3E5D9DE; Tue, 9 Nov 2021 01:43:05 +0000 (UTC) Message-ID: Date: Mon, 8 Nov 2021 20:43:04 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH] powerpc/pseries/cpuhp: Use alloc_cpumask_var() in pseries_cpu_hotplug_init() Content-Language: en-US To: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Daniel Henrique Barboza , Nathan Lynch , "Aneesh Kumar K.V" References: <20211108164751.65565-1-longman@redhat.com> <87y25ym96i.fsf@mpe.ellerman.id.au> From: Waiman Long In-Reply-To: <87y25ym96i.fsf@mpe.ellerman.id.au> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zhang Xiaoxu , Laurent Dufour , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 11/8/21 20:04, Michael Ellerman wrote: > Waiman Long writes: >> It was found that the following warning message could be printed out when >> booting the kernel on PowerPC systems that support LPAR: >> >> [ 0.129584] WARNING: CPU: 0 PID: 1 at mm/memblock.c:1451 memblock_alloc_internal+0x5c/0x104 >> [ 0.129593] Modules linked in: >> [ 0.129598] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-11.el9.ppc64le+debug #1 >> [ 0.129605] NIP: c000000002040134 LR: c00000000204011c CTR: c0000000020241a8 >> [ 0.129610] REGS: c000000005637760 TRAP: 0700 Not tainted (5.14.0-11.el9.ppc64le+debug) >> [ 0.129616] MSR: 8000000002029033 CR: 48000222 XER: 00000002 >> [ 0.129635] CFAR: c0000000004d1cf4 IRQMASK: 0 >> [ 0.129635] GPR00: c00000000204011c c000000005637a00 c000000002c94d00 0000000000000001 >> [ 0.129635] GPR04: 0000000000000080 0000000000000000 0000000000000000 ffffffffffffffff >> [ 0.129635] GPR08: 0000000000000000 0000000000000003 c00000000205ac64 0000000000080000 >> [ 0.129635] GPR12: 0000000000000000 c0000000049d0000 c000000000013078 0000000000000000 >> [ 0.129635] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 >> [ 0.129635] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 >> [ 0.129635] GPR24: c000000002003808 c00000000146f7b8 0000000000000000 0000000000000100 >> [ 0.129635] GPR28: c000000002d7cf80 0000000000000000 0000000000000008 0000000000000000 >> [ 0.129710] NIP [c000000002040134] memblock_alloc_internal+0x5c/0x104 >> [ 0.129717] LR [c00000000204011c] memblock_alloc_internal+0x44/0x104 >> [ 0.129723] Call Trace: >> [ 0.129726] [c000000005637a00] [c000000005637a40] 0xc000000005637a40 (unreliable) >> [ 0.129735] [c000000005637a60] [c0000000020404d8] memblock_alloc_try_nid+0x94/0xcc >> [ 0.129743] [c000000005637af0] [c00000000205ac64] alloc_bootmem_cpumask_var+0x4c/0x9c >> [ 0.129751] [c000000005637b60] [c0000000020242e0] __machine_initcall_pseries_pseries_cpu_hotplug_init+0x138/0x1d8 >> [ 0.129760] [c000000005637bf0] [c000000000012404] do_one_initcall+0xa4/0x4f0 >> [ 0.129768] [c000000005637cd0] [c000000002005358] do_initcalls+0x140/0x18c >> [ 0.129776] [c000000005637d80] [c0000000020055b8] kernel_init_freeable+0x178/0x1d0 >> [ 0.129783] [c000000005637db0] [c0000000000130a0] kernel_init+0x30/0x190 >> [ 0.129790] [c000000005637e10] [c00000000000cef4] ret_from_kernel_thread+0x5c/0x64 >> >> The warning is printed in memblock_alloc_internal() because the slab >> has been initialized when the initcalls are being processed. To >> avoid the warning, change alloc_bootmem_cpumask_var() call in >> pseries_cpu_hotplug_init() to alloc_cpumask_var() instead. Also >> change cpumask_or() to cpumask_copy() or we will have to use >> zalloc_cpumask_var(). >> >> Fixes: bd1dd4c5f528 ("powerpc/pseries: Prevent free CPU ids being reused on another node") >> Signed-off-by: Waiman Long >> --- >> arch/powerpc/platforms/pseries/hotplug-cpu.c | 8 ++++---- >> 1 file changed, 4 insertions(+), 4 deletions(-) > > This looks similar to the patch Nick sent recently: > > https://lore.kernel.org/linuxppc-dev/20211105132923.1582514-1-npiggin@gmail.com/ I was not aware of Nick's patch. Since a fix is pending, I am withdrawing mime. Cheers, Longman