After the introduction of clear_pages() we exploit the fact that the process vm_area is allocated in contiguous pages to just clear them all in one swift operation. Suggested-by: Mateusz Guzik Link: https://lore.kernel.org/linux-mm/dpnwsp7dl4535rd7qmszanw6u5an2p74uxfex4dh53frpb7pu3@2bnjjavjrepe/ Suggested-by: Pasha Tatashin Link: https://lore.kernel.org/20240311164638.2015063-7-pasha.tatashin@soleen.com Signed-off-by: Linus Walleij --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index e832da9d15a4..88d78ccef245 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -345,7 +345,7 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node) stack = kasan_reset_tag(vm_area->addr); /* Clear stale pointers from reused stack. */ - memset(stack, 0, THREAD_SIZE); + clear_pages(vm_area->addr, vm_area->nr_pages); tsk->stack_vm_area = vm_area; tsk->stack = stack; --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20260224-mm-fork-clear-pages-ae7c52d12a93 Best regards, -- Linus Walleij