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>> + int test_num; >> +}; >> + > > This is a description of the specific capabilties / bits of > the IFS on e.g. Saphire Rapids, so please name this appropriately > for example: > > struct ifs_hw_caps { > int integrity_cap_bit; > int test_num; > }; This can be renamed to ifs_test_caps as it holds test specific fields. ... > > You got this exactly the wrong way around, there should be a single > > static const struct ifs_hw_caps saphire_rapids_caps = { > .integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT, > .test_num = 0, > }; > > And then struct ifs_device { } should have a "const struct ifs_hw_caps *hw_caps" > which gets initialized to point to &saphire_rapids_caps. So that your const > data is actually const. > > Where as since the r/w data's lifetime is couple to the misc-device lifetime > there is no need to dynamically allocate it just keep that embedded, so that > together you get: Noted > > struct ifs_device { > const struct ifs_hw_caps *hw_caps; > struct ifs_data data; > struct miscdevice misc; > }; > The initialization portion, taking into account your suggestion above, translates to: static const struct ifs_test_caps scan_test = { .integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT, .test_num = IFS_TYPE_SAF, }; static const struct ifs_test_caps array_test = { .integrity_cap_bit = MSR_INTEGRITY_CAPS_ARRAY_BIST_BIT, .test_num = IFS_TYPE_ARRAY_BIST, }; static struct ifs_device ifs_devices[] = { [IFS_TYPE_SAF] = { .test_caps = &scan_test, .misc = { .name = "intel_ifs_0", .minor = MISC_DYNAMIC_MINOR, .groups = plat_ifs_groups, }, }, [IFS_TYPE_ARRAY_BIST] = { .test_caps = &array_test, .misc = { .name = "intel_ifs_1", .minor = MISC_DYNAMIC_MINOR, .groups = plat_ifs_array_groups, }, }, }; Jithu