[PATCH] erofs: fix PSI memstall accounting

[Max Kellermann]

On Tue, Dec 3, 2024 at 9:15 AM Gao Xiang <hsiangkao at linux.alibaba.com> wrote:
> But I guess you could record more frame addresses to get the caller
> of readahead_expand()? e.g. __builtin_return_address(1)?

This turned out to be a big disaster. __builtin_return_address(1)
instantly crashes the kernel, causing the whole (production) cluster
to go down.