Re: const qualifiers on function returns type

[Bodo Eggert]

Benoit Boissinot <bboissin@xxxxxxxxx> wrote:

> extern const cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
> 
> I was wondering what means const for a function returns type.
> K&R doesn't say anything about this and gcc-4 warns (warning: type
> qualifiers ignored on function return type)

It used to be a hint that the function has no side effect nor depends on
any variable besides the parameters. Calls to those functions may be cached
or omitted.
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