On 03/04, Oleg Nesterov wrote: > > On 03/03, Linus Torvalds wrote: > > > > +/* > > + * Really only alpha needs 32-bit fields, but > > + * might as well do it for 64-bit architectures > > + * since that's what we've historically done, > > + * and it makes 'head_tail' always be a simple > > + * 'unsigned long'. > > + */ > > +#ifdef CONFIG_64BIT > > + typedef unsigned int pipe_index_t; > > +#else > > + typedef unsigned short pipe_index_t; > > +#endif > > I am just curious, why we can't use "unsigned short" unconditionally > and avoid #ifdef ? > > Is "unsigned int" more efficient on 64-bit? Ah, I guess I misread the comment... So, the problem is that 64-bit alpha can't write u16 "atomically" ? Oleg.
