On Mon, May 02, 2016 at 10:59:50AM -0700, Christoph Hellwig wrote:
> On Mon, May 02, 2016 at 10:57:38AM -0700, Paul E. McKenney wrote:
> > -#define rcu_assign_pointer(p, v) smp_store_release(&p, RCU_INITIALIZER(v))
> > +#define rcu_assign_pointer(p, v) \
> > +({ \
> > + uintptr_t _r_a_p__v = (uintptr_t)(v); \
> > + \
> > + if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \
> > + WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \
> > + else \
> > + smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
> > + _r_a_p__v; \
> > +})
>
> Can't we turn it into an inline (would need different calling
> conventions for p, though).
And for v. But how do I do that without C++ templates?
Also, does __builtin_constant_p() work reliably on a parameter?
Especially when the compiler decides not to do the inlining?
Thanx, Paul
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