linux-kernel - Re: [PATCH resend 1/6] delay: add poll_event

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Message-ID: <1517245212.2687.13.camel@wdc.com>
Date:   Mon, 29 Jan 2018 17:00:14 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kstewart@...uxfoundation.org" <kstewart@...uxfoundation.org>,
        "pombredanne@...b.com" <pombredanne@...b.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "christophe.jaillet@...adoo.fr" <christophe.jaillet@...adoo.fr>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "tim@...erelk.net" <tim@...erelk.net>
Subject: Re: [PATCH resend 1/6] delay: add poll_event_interruptible

On Fri, 2018-01-26 at 17:58 +0100, Michal Suchanek wrote:
> Add convenience macro for polling an event that does not have a
> waitqueue.
> 
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---
>  include/linux/delay.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/include/linux/delay.h b/include/linux/delay.h
> index b78bab4395d8..3ae9fa395628 100644
> --- a/include/linux/delay.h
> +++ b/include/linux/delay.h
> @@ -64,4 +64,16 @@ static inline void ssleep(unsigned int seconds)
>  	msleep(seconds * 1000);
>  }
>  
> +#define poll_event_interruptible(event, interval) ({ \
> +	int ret = 0; \
> +	while (!(event)) { \
> +		if (signal_pending(current)) { \
> +			ret = -ERESTARTSYS; \
> +			break; \
> +		} \
> +		msleep_interruptible(interval); \
> +	} \
> +	ret; \
> +})
> +
>  #endif /* defined(_LINUX_DELAY_H) */

Sorry but I'm not sure we should encourage other kernel developers to use
busy-waiting by adding the poll_event_interruptible() macro to a system-wide
header file. Can that macro be moved into a CDROM-specific .c or .h file?

Thanks,

Bart.