linux-kernel - Re: [PATCH -next] fs/epoll: simply CONFIG_NET_RX_BUSY

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Message-ID: <20180725200633.c36cdaf4ymgscump@linux-r8p5>
Date:   Wed, 25 Jul 2018 13:06:33 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     jbaron@...mai.com, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH -next] fs/epoll: simply CONFIG_NET_RX_BUSY_POLL ifdefery

On Wed, 25 Jul 2018, Andrew Morton wrote:

>On Wed, 25 Jul 2018 11:56:20 -0700 Davidlohr Bueso <dave@...olabs.net> wrote:
>
>> ... 'tis easier on the eye.
>
>true, but.
>
>> +#else
>> +#define ep_busy_loop(ep, nonblock)		do { } while (0)
>> +#define ep_reset_busy_poll_napi_id(ep)		do { } while (0)
>> +#define ep_set_busy_poll_napi_id(epi)		do { } while (0)
>> +
>> +#endif /* CONFIG_NET_RX_BUSY_POLL */
>
>inlines are preferred.  Because macros are fugly and can cause
>unused-var warnings when the stub versions are used.

Fair enough.

>This?

Do you want me to send a v2 or will you fold in the below?

Thanks,
Davidlohr

>
>--- a/fs/eventpoll.c~fs-epoll-simply-config_net_rx_busy_poll-ifdefery-fix
>+++ a/fs/eventpoll.c
>@@ -449,9 +449,18 @@ static inline void ep_set_busy_poll_napi
> }
>
> #else
>-#define ep_busy_loop(ep, nonblock)		do { } while (0)
>-#define ep_reset_busy_poll_napi_id(ep)		do { } while (0)
>-#define ep_set_busy_poll_napi_id(epi)		do { } while (0)
>+
>+static inline void ep_busy_loop(struct eventpoll *ep, int nonblock)
>+{
>+}
>+
>+static inline void ep_reset_busy_poll_napi_id(struct eventpoll *ep)
>+{
>+}
>+
>+static inline void ep_set_busy_poll_napi_id(struct epitem *epi)
>+{
>+}
>
> #endif /* CONFIG_NET_RX_BUSY_POLL */
>
>_
>