From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Fri, 27 Jan 2017 11:31:04 +0000 Subject: [PATCH V2] arm64: skip register_cpufreq_notifier on ACPI-based systems In-Reply-To: <20170126181116.GT14167@arm.com> References: <1485454112-4823-1-git-send-email-pprakash@codeaurora.org> <20170126181116.GT14167@arm.com> Message-ID: <20170127113103.GC27424@e104818-lin.cambridge.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Jan 26, 2017 at 06:11:17PM +0000, Will Deacon wrote: > On Thu, Jan 26, 2017 at 11:08:32AM -0700, Prashanth Prakash wrote: > > On ACPI based systems where the topology is setup using the API > > store_cpu_topology, at the moment we do not have necessary code > > to parse cpu capacity and handle cpufreq notifier, thus > > resulting in a kernel panic. > > > > Stack: > > init_cpu_capacity_callback+0xb4/0x1c8 > > notifier_call_chain+0x5c/0xa0 > > __blocking_notifier_call_chain+0x58/0xa0 > > blocking_notifier_call_chain+0x3c/0x50 > > cpufreq_set_policy+0xe4/0x328 > > cpufreq_init_policy+0x80/0x100 > > cpufreq_online+0x418/0x710 > > cpufreq_add_dev+0x118/0x180 > > subsys_interface_register+0xa4/0xf8 > > cpufreq_register_driver+0x1c0/0x298 > > cppc_cpufreq_init+0xdc/0x1000 [cppc_cpufreq] > > do_one_initcall+0x5c/0x168 > > do_init_module+0x64/0x1e4 > > load_module+0x130c/0x14d0 > > SyS_finit_module+0x108/0x120 > > el0_svc_naked+0x24/0x28 > > > > Fixes: 7202bde8b7ae ("arm64: parse cpu capacity-dmips-mhz from DT") > > Signed-off-by: Prashanth Prakash > > --- > > arch/arm64/kernel/topology.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > Acked-by: Will Deacon > > Catalin -- this resolves a panic, so please take it for 4.10 Applied. Thanks. -- Catalin