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kernel: arch: move arch_swap() declaration

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Moves the arch_swap() declaration out of kernel_arch_interface.h
and into the various architectures' kernel_arch_func.h. This
permits the arch_swap() to be inlined on ARM, but extern'd on
the other architectures that still implement arch_swap().

Inlining this function on ARM has shown at least a +5% performance
boost according to the thread_metric benchmark on the disco_l475_iot1
board.

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
This commit is contained in:
Peter Mitsis 2024-11-26 10:43:07 -08:00 • committed by Benjamin Cabé
commit 909ff45f0c
12 changed files with 60 additions and 85 deletions
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13
tests/arch/arm/arm_thread_swap/src/arm_thread_arch.c
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@ -429,6 +429,13 @@ static void alt_thread_entry(void *p1, void *p2, void *p3)
"Alternative thread: switch flag not false on thread exit\n");
}
#if !defined(CONFIG_NO_OPTIMIZATIONS)
static int __noinline arch_swap_wrapper(void)
{
return arch_swap(BASEPRI_MODIFIED_1);
}
#endif
ZTEST(arm_thread_swap, test_arm_thread_swap)
{
int test_flag;
@ -609,9 +616,11 @@ ZTEST(arm_thread_swap, test_arm_thread_swap)
/* Fake a different irq_unlock key when performing swap.
* This will be verified by the alternative test thread.
*
* Force an indirect call to arch_swap() to prevent the compiler from
* changing the saved callee registers as arch_swap() is inlined.
*/
register int swap_return_val __asm__("r0") =
arch_swap(BASEPRI_MODIFIED_1);
register int swap_return_val __asm__("r0") = arch_swap_wrapper();
#endif /* CONFIG_NO_OPTIMIZATIONS */