Messages in this thread | | | From | Vincent Guittot <> | Date | Thu, 25 Apr 2024 13:13:57 +0200 | Subject | Re: [tip:sched/core 26/27] drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) |
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Hi Yujie,
On Thu, 25 Apr 2024 at 12:57, Yujie Liu <yujie.liu@intel.com> wrote: > > Hi Vincent, > > On Thu, Apr 25, 2024 at 08:36:31AM +0200, Vincent Guittot wrote: > > Hi, > > > > On Thu, 25 Apr 2024 at 01:22, kernel test robot <lkp@intel.com> wrote: > > > > > > Hi Vincent, > > > > > > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core > > > head: 97450eb909658573dcacc1063b06d3d08642c0c1 > > > commit: d4dbc991714eefcbd8d54a3204bd77a0a52bd32d [26/27] sched/cpufreq: Rename arch_update_thermal_pressure() => arch_update_hw_pressure() > > > > I'm going to look at this more deeply but this patch only rename > > "thermal_pressure" by "hw_pressure" so unless I miss a renaming, this > > should not trigger anything new. > > Before renaming, there is a global "thermal_pressure", and a local > "th_pressure" inside topology_update_thermal_pressure function. They > live together peacefully since they have different names. > > DEFINE_PER_CPU(unsigned long, thermal_pressure); > ^____ > > void topology_update_thermal_pressure(const struct cpumask *cpus, > unsigned long capped_freq) > { > unsigned long max_capacity, capacity, th_pressure; > ^____ > ... > for_each_cpu(cpu, cpus) > WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure); > ^____ ^____ > } > > After renaming, the global and local variables are both given the same > name "hw_pressure", so the local one shadows the global one, causing > this sparse warning. > > DEFINE_PER_CPU(unsigned long, hw_pressure); > ^___ > > void topology_update_hw_pressure(const struct cpumask *cpus, > unsigned long capped_freq) > { > unsigned long max_capacity, capacity, hw_pressure; > ^___ > ... > for_each_cpu(cpu, cpus) > WRITE_ONCE(per_cpu(hw_pressure, cpu), hw_pressure); > ^____ ^____ > } > > > We can give them different names as before to fix this warning:
Yes, that's what I noticed as well. I sent the fix here: https://lore.kernel.org/lkml/20240425073709.379016-1-vincent.guittot@linaro.org/
> > --------------------------------------------------------------- > > diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c > index 0248912ff6875..c66d070207a0e 100644 > --- a/drivers/base/arch_topology.c > +++ b/drivers/base/arch_topology.c > @@ -179,7 +179,7 @@ DEFINE_PER_CPU(unsigned long, hw_pressure); > void topology_update_hw_pressure(const struct cpumask *cpus, > unsigned long capped_freq) > { > - unsigned long max_capacity, capacity, hw_pressure; > + unsigned long max_capacity, capacity, pressure; > u32 max_freq; > int cpu; > > @@ -196,12 +196,12 @@ void topology_update_hw_pressure(const struct cpumask *cpus, > else > capacity = mult_frac(max_capacity, capped_freq, max_freq); > > - hw_pressure = max_capacity - capacity; > + pressure = max_capacity - capacity; > > - trace_hw_pressure_update(cpu, hw_pressure); > + trace_hw_pressure_update(cpu, pressure); > > for_each_cpu(cpu, cpus) > - WRITE_ONCE(per_cpu(hw_pressure, cpu), hw_pressure); > + WRITE_ONCE(per_cpu(hw_pressure, cpu), pressure); > } > EXPORT_SYMBOL_GPL(topology_update_hw_pressure); > > -- > > Thanks, > Yujie > > > > config: arm64-randconfig-r132-20240425 (https://download.01.org/0day-ci/archive/20240425/202404250740.VhQQoD7N-lkp@intel.com/config) > > > compiler: aarch64-linux-gcc (GCC) 13.2.0 > > > reproduce: (https://download.01.org/0day-ci/archive/20240425/202404250740.VhQQoD7N-lkp@intel.com/reproduce) > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > > the same patch/commit), kindly add following tags > > > | Reported-by: kernel test robot <lkp@intel.com> > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202404250740.VhQQoD7N-lkp@intel.com/ > > > > > > sparse warnings: (new ones prefixed by >>) > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > >> drivers/base/arch_topology.c:204:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got unsigned long * @@ > > > drivers/base/arch_topology.c:204:17: sparse: expected void const [noderef] __percpu *__vpp_verify > > > drivers/base/arch_topology.c:204:17: sparse: got unsigned long * > > > > > > vim +204 drivers/base/arch_topology.c > > > > > > 164 > > > 165 /** > > > 166 * topology_update_hw_pressure() - Update HW pressure for CPUs > > > 167 * @cpus : The related CPUs for which capacity has been reduced > > > 168 * @capped_freq : The maximum allowed frequency that CPUs can run at > > > 169 * > > > 170 * Update the value of HW pressure for all @cpus in the mask. The > > > 171 * cpumask should include all (online+offline) affected CPUs, to avoid > > > 172 * operating on stale data when hot-plug is used for some CPUs. The > > > 173 * @capped_freq reflects the currently allowed max CPUs frequency due to > > > 174 * HW capping. It might be also a boost frequency value, which is bigger > > > 175 * than the internal 'capacity_freq_ref' max frequency. In such case the > > > 176 * pressure value should simply be removed, since this is an indication that > > > 177 * there is no HW throttling. The @capped_freq must be provided in kHz. > > > 178 */ > > > 179 void topology_update_hw_pressure(const struct cpumask *cpus, > > > 180 unsigned long capped_freq) > > > 181 { > > > 182 unsigned long max_capacity, capacity, hw_pressure; > > > 183 u32 max_freq; > > > 184 int cpu; > > > 185 > > > 186 cpu = cpumask_first(cpus); > > > 187 max_capacity = arch_scale_cpu_capacity(cpu); > > > 188 max_freq = arch_scale_freq_ref(cpu); > > > 189 > > > 190 /* > > > 191 * Handle properly the boost frequencies, which should simply clean > > > 192 * the HW pressure value. > > > 193 */ > > > 194 if (max_freq <= capped_freq) > > > 195 capacity = max_capacity; > > > 196 else > > > 197 capacity = mult_frac(max_capacity, capped_freq, max_freq); > > > 198 > > > 199 hw_pressure = max_capacity - capacity; > > > 200 > > > 201 trace_hw_pressure_update(cpu, hw_pressure); > > > 202 > > > 203 for_each_cpu(cpu, cpus) > > > > 204 WRITE_ONCE(per_cpu(hw_pressure, cpu), hw_pressure); > > > 205 } > > > 206 EXPORT_SYMBOL_GPL(topology_update_hw_pressure); > > > 207 > > > > > > -- > > > 0-DAY CI Kernel Test Service > > > https://github.com/intel/lkp-tests/wiki > >
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