Messages in this thread | | | Date | Mon, 31 Jul 2017 09:58:40 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] futex: split PI support to a file of its own |
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On Sat, 29 Jul 2017, Nicolas Pitre wrote:
> Split out the priority inheritance support to a file of its own > to make futex.c much smaller, easier to understand and, hopefully, > to maintain. This also makes it easy to preserve basic futex support > and compile out the PI support when RT mutexes are not available.
I can see your motivation to compile out PI support, which is why you worked on this in the first place.
But I really do not agree with your reasoning about easier to understand and maintain. I have the dubious pleasure to stare into that code on a regular base. PI and non PI share a lot of code and it's really not helping to have two separate files to stare at. That makes following the PI code even harder than it is already. So I rather like to see that PI code in an #ifdef block and not split out into its own file.
> Signed-off-by: Nicolas Pitre <nico@linaro.org>
Please provide a diffstat along with the patch next time.
> diff --git a/include/linux/futex.h b/include/linux/futex.h
> +#ifdef CONFIG_FUTEX_PI > +#include "futex_pi.c" > +#else > +#define get_pi_state(...) > +#define put_pi_state(...) > +#define refill_pi_state_cache() false > +#define lookup_pi_state(...) -ENOSYS > +#define rt_mutex_start_proxy_lock(...) -ENOSYS > +#define requeue_pi_wake_futex(...) > +#define futex_proxy_trylock_atomic(...) -ENOSYS > +#define futex_lock_pi(...) -ENOSYS > +#define futex_unlock_pi(...) -ENOSYS > +#define futex_wait_requeue_pi(...) -ENOSYS > +#endif
Bah, no. We use static inlines as stubs whereever it's possible. Using macros is just a sloppy hackery.
Thanks,
tglx
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