On Fri, Sep 17, 2021 at 11:02:07AM +0800, 王贇 wrote:

On 2021/9/16 下午6:02, Peter Zijlstra wrote:
[snip]

quoted

 
+static __always_inline bool in_stack_guard(void *addr, void *begin, void *end)
+{
+#ifdef CONFIG_VMAP_STACK
+	if (addr > (begin - PAGE_SIZE))
+		return true;

After fix this logical as:

  addr >= (begin - PAGE_SIZE) && addr < begin

it's working.

Shees, I seem to have a knack for getting it wrong, don't I. Thanks!

Anyway, I'll ammend the commit locally, but I'd really like some
feedback from Andy, who wrote all that VIRT_STACK stuff in the first
place.