On Tue, 9 Apr 2019 13:42:08 -0700 Yury Norov <yury.no...@gmail.com> wrote:
> From: Yury Norov <yno...@marvell.com> > > cpumask_parse() finds first occurrence of either \n or \0 by calling > strchr() and strlen(). We can do it better with a single call of > strchrnul(). Fair enough. > --- a/include/linux/cpumask.h > +++ b/include/linux/cpumask.h > @@ -633,8 +633,7 @@ static inline int cpumask_parselist_user(const char > __user *buf, int len, > */ > static inline int cpumask_parse(const char *buf, struct cpumask *dstp) > { > - char *nl = strchr(buf, '\n'); > - unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf); > + unsigned int len = (unsigned int)(strchrnul(buf, '\n') - buf); Does the cast do anything useful? The compiler will convert a ptrdiff_t to uint without issues, I think? > return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits); > }