Re: [PATCH] cacheinfo: Keep the old value if of_property_read_u32 fails
Hi Huacai, On Thu, Oct 18, 2018 at 09:28:11AM +0800, Huacai Chen wrote: > Hi, Sudeep, > > Please see this call-graph: > > static int detect_cache_attributes(unsigned int cpu) > > ret = populate_cache_leaves(cpu); > > ret = cache_shared_cpu_map_setup(cpu); --> > cache_setup_of_node() --> cache_of_set_props() --> > cache_size()/cache_nr_sets > > populate_cache_leaves() is arch-specific, All archs except arm64 have > provide initial values to cacheinfo:size and cacheinfo:number_of_sets. > > Related files: > arch/nds32/kernel/cacheinfo.c > arch/mips/kernel/cacheinfo.c Only above 2 could be affected, but I want to be sure. I wasn't aware of MIPS arch setting values elsewhere, assumed DT, my bad. You have still not answered my question. Which arch are you facing issue ? Or are you proposing this by code inspection ? I changes look fine, but want to be sure if the issue you are seeing is in above architectures. -- Regards, Sudeep
Re: [PATCH] cacheinfo: Keep the old value if of_property_read_u32 fails
Hi, Sudeep, Please see this call-graph: static int detect_cache_attributes(unsigned int cpu) ret = populate_cache_leaves(cpu); ret = cache_shared_cpu_map_setup(cpu); --> cache_setup_of_node() --> cache_of_set_props() --> cache_size()/cache_nr_sets populate_cache_leaves() is arch-specific, All archs except arm64 have provide initial values to cacheinfo:size and cacheinfo:number_of_sets. Related files: arch/nds32/kernel/cacheinfo.c arch/riscv/kernel/cacheinfo.c arch/s390/kernel/cache.c arch/mips/kernel/cacheinfo.c arch/x86/kernel/cpu/cacheinfo.c Regards, Huacai On Wed, Oct 17, 2018 at 5:35 PM Sudeep Holla wrote: > > On Wed, Oct 17, 2018 at 09:26:03AM +0800, Huacai Chen wrote: > > Commit 448a5a552f336bd7b847b1951 ("drivers: base: cacheinfo: use OF > > property_read_u32 instead of get_property,read_number") makes cache > > size and number_of_sets be 0 if DT doesn't provide there values. I > > think this is unreasonable so make them keep the old values, which is > > the same as old kernels. > > > > What old values does the kernel have ? Which architecture are you referring ? > If DT doesn't have entry then we can't expose sysfs, hence 0. > Please provide more details on the issue you are seeing. > > -- > Regards, > Sudeep
Re: [PATCH] cacheinfo: Keep the old value if of_property_read_u32 fails
On Wed, Oct 17, 2018 at 09:26:03AM +0800, Huacai Chen wrote: > Commit 448a5a552f336bd7b847b1951 ("drivers: base: cacheinfo: use OF > property_read_u32 instead of get_property,read_number") makes cache > size and number_of_sets be 0 if DT doesn't provide there values. I > think this is unreasonable so make them keep the old values, which is > the same as old kernels. > What old values does the kernel have ? Which architecture are you referring ? If DT doesn't have entry then we can't expose sysfs, hence 0. Please provide more details on the issue you are seeing. -- Regards, Sudeep