Re: [PATCH v5] fs: introduce is_dot_or_dotdot helper for cleanup

[Matthew Wilcox]

On Wed, Dec 11, 2019 at 03:17:11PM +0800, Gao Xiang wrote:
> > static inline bool is_dot_or_dotdot(const unsigned char *name, size_t len)
> > {
> >         if (len >= 1 && unlikely(name[0] == '.')) {
> 
> 
> And I suggest drop "unlikely" here since files start with prefix
> '.' (plus specical ".", "..") are not as uncommon as you expected...

They absolutely are uncommon.  Even if you just consider
/home/willy/kernel/linux/.git/config, only one of those six path elements
starts with a '.'.