Currently the governors are declared in their respective files but they export their [un]register functions which in turn call the [un]register the governors core's functions. That implies a cyclic dependency which is not desirable. There is a way to self-encapsulate the governors by letting them to declare themselves in a __init section table.
Define the table in the asm generic linker description like the other tables and provide the specific macros to deal with. Signed-off-by: Daniel Lezcano <[email protected]> --- drivers/thermal/thermal_core.h | 16 ++++++++++++++++ include/asm-generic/vmlinux.lds.h | 11 +++++++++++ 2 files changed, 27 insertions(+) diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h index 0df190ed82a7..28d18083e969 100644 --- a/drivers/thermal/thermal_core.h +++ b/drivers/thermal/thermal_core.h @@ -15,6 +15,22 @@ /* Initial state of a cooling device during binding */ #define THERMAL_NO_TARGET -1UL +/* Init section thermal table */ +extern struct thermal_governor * __governor_thermal_table[]; +extern struct thermal_governor * __governor_thermal_table_end[]; + +#define THERMAL_TABLE_ENTRY(table, name) \ + static typeof(name) * __thermal_table_entry_##name \ + __used __section(__##table##_thermal_table) \ + = &name; + +#define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor, name) + +#define for_each_governor_table(__governor) \ + for (__governor = __governor_thermal_table; \ + __governor < __governor_thermal_table_end; \ + __governor++) + /* * This structure is used to describe the behavior of * a certain cooling device on a certain trip point diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index f8f6f04c4453..9893a3ed242a 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -239,6 +239,16 @@ #define ACPI_PROBE_TABLE(name) #endif +#ifdef CONFIG_THERMAL +#define THERMAL_TABLE(name) \ + . = ALIGN(8); \ + __##name##_thermal_table = .; \ + KEEP(*(__##name##_thermal_table)) \ + __##name##_thermal_table_end = .; +#else +#define THERMAL_TABLE(name) +#endif + #define KERNEL_DTB() \ STRUCT_ALIGN(); \ __dtb_start = .; \ @@ -609,6 +619,7 @@ IRQCHIP_OF_MATCH_TABLE() \ ACPI_PROBE_TABLE(irqchip) \ ACPI_PROBE_TABLE(timer) \ + THERMAL_TABLE(governor) \ EARLYCON_TABLE() \ LSM_TABLE() -- 2.17.1
