From patchwork series 391628

https://patchwork.ozlabs.org//project/linuxppc-dev/list/?series=391628

arch/powerpc/mm/kasan/init_32.c

@@ -64,6 +64,7 @@ int __init __weak kasan_init_region(void *start, size_t size)
 	if (ret)
 		return ret;
 
+	k_start = k_start & PAGE_MASK;
 	block = memblock_alloc(k_end - k_start, PAGE_SIZE);
 	if (!block)
 		return -ENOMEM;