On Monday 07 December 2015 10:26:34 Daniel Cashman wrote:
> > Ideally we'd remove the #ifdef around the mmap_rnd_compat_bits declaration
> > and change this code to use
> >
> > if (IS_ENABLED(CONFIG_COMPAT) && test_thread_flag(TIF_32BIT))
> >
> That would result in "undefined reference to mmap_rnd_compat_bits" in
> the not-defined case, no?
No. The compiler eliminates all code paths that it knows are unused.
The IS_ENABLED() macro is designed to let the compiler figure this out.
Arnd
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