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kernel: Predicate _cpus_active on CONFIG_PM

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This value isn't used outside of the PM subsystem, so don't build it.

More important than the four bytes of .bss was the use of an
atomic_inc().  Some platforms are forced to use
CONFIG_ATOMIC_OPERATIONS_C (but in almost all cases are single-core
devices that won't use atomics at runtime).  There, this turns into a
function call that pulls in the whole atomics implementation.

Signed-off-by: Andy Ross <andyross@google.com>
This commit is contained in:
Andy Ross 2023-08-05 08:54:31 -07:00 • committed by Carles Cufí
commit 17a5beb341
1 changed files with 5 additions and 2 deletions
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7
kernel/init.c
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@ -46,8 +46,9 @@ BUILD_ASSERT(CONFIG_MP_NUM_CPUS == CONFIG_MP_MAX_NUM_CPUS,
__pinned_bss
struct z_kernel _kernel;
__pinned_bss
atomic_t _cpus_active;
#ifdef CONFIG_PM
__pinned_bss atomic_t _cpus_active;
#endif
/* init/main and idle threads */
K_THREAD_PINNED_STACK_DEFINE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
@ -512,11 +513,13 @@ void z_init_cpu(int id)
CONFIG_SCHED_THREAD_USAGE_AUTO_ENABLE;
#endif
#ifdef CONFIG_PM
/*
* Increment number of CPUs active. The pm subsystem
* will keep track of this from here.
*/
atomic_inc(&_cpus_active);
#endif
#ifdef CONFIG_OBJ_CORE_SYSTEM
k_obj_core_init_and_link(K_OBJ_CORE(&_kernel.cpus[id]), &obj_type_cpu);