kernel: arch: use ENOTSUP instead of ENOSYS in k_float_disable()

This patch replaces ENOSYS into ENOTSUP to keep consistency with
the return value specification of k_float_enable().

Signed-off-by: Katsuhiro Suzuki <[email protected]>

Author: katsuster

arch/sparc/core/thread.c

@@ -76,7 +76,7 @@ void *z_arch_get_next_switch_handle(struct k_thread **old_thread)
 #if defined(CONFIG_FPU_SHARING)
 int arch_float_disable(struct k_thread *thread)
 {
-	return -ENOSYS;
+	return -ENOTSUP;
 }
 
 int arch_float_enable(struct k_thread *thread, unsigned int options)

arch/x86/core/ia32/thread.c

@@ -56,7 +56,7 @@ int arch_float_disable(struct k_thread *thread)
 #if defined(CONFIG_LAZY_FPU_SHARING)
 	return z_float_disable(thread);
 #else
-	return -ENOSYS;
+	return -ENOTSUP;
 #endif /* CONFIG_LAZY_FPU_SHARING */
 }
 

include/kernel.h

@@ -5538,9 +5538,9 @@ __syscall void k_str_out(char *c, size_t n);
  *
  * @param thread ID of thread.
  *
- * @retval 0       On success.
- * @retval -ENOSYS If the floating point disabling is not implemented.
- *         -EINVAL If the floating point disabling could not be performed.
+ * @retval 0        On success.
+ * @retval -ENOTSUP If the floating point disabling is not implemented.
+ *         -EINVAL  If the floating point disabling could not be performed.
  */
 __syscall int k_float_disable(struct k_thread *thread);
 

kernel/thread.c

@@ -880,7 +880,7 @@ int z_impl_k_float_disable(struct k_thread *thread)
 #if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
 	return arch_float_disable(thread);
 #else
-	return -ENOSYS;
+	return -ENOTSUP;
 #endif /* CONFIG_FPU && CONFIG_FPU_SHARING */
 }
 

tests/kernel/fpu_sharing/float_disable/src/k_float_disable.c

@@ -36,7 +36,7 @@ static void usr_fp_thread_entry_1(void)
 	(defined(CONFIG_X86) && defined(CONFIG_LAZY_FPU_SHARING))
 #define K_FLOAT_DISABLE_SYSCALL_RETVAL 0
 #else
-#define K_FLOAT_DISABLE_SYSCALL_RETVAL -ENOSYS
+#define K_FLOAT_DISABLE_SYSCALL_RETVAL -ENOTSUP
 #endif
 
 static void usr_fp_thread_entry_2(void)
@@ -98,7 +98,7 @@ void test_k_float_disable_common(void)
 		usr_fp_thread.base.user_options);
 #else
 	/* Verify k_float_disable() is not supported */
-	zassert_true((k_float_disable(&usr_fp_thread) == -ENOSYS),
+	zassert_true((k_float_disable(&usr_fp_thread) == -ENOTSUP),
 		"k_float_disable() successful when not supported");
 #endif
 }