tests: x86/pagetables: limit permission test under demand paging

When demand paging is enabled and not all generic sections are
in physical memory at boot, only tests the permission up to the end
of the pinned section.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

tests/arch/x86/pagetables/src/main.c

@@ -80,7 +80,13 @@ void test_ram_perms(void)
 
 	pentry_t entry, flags, expected;
 
-	for (pos = Z_KERNEL_VIRT_START; pos < Z_KERNEL_VIRT_END;
+#ifdef CONFIG_LINKER_GENERIC_SECTIONS_PRESENT_AT_BOOT
+	const uint8_t *mem_range_end = Z_KERNEL_VIRT_END;
+#else
+	const uint8_t *mem_range_end = (uint8_t *)lnkr_pinned_end;
+#endif /* CONFIG_LINKER_GENERIC_SECTIONS_PRESENT_AT_BOOT */
+
+	for (pos = Z_KERNEL_VIRT_START; pos < mem_range_end;
 	     pos += CONFIG_MMU_PAGE_SIZE) {
 		if (pos == NULL) {
 			/* We have another test specifically for NULL page */