linux-kernel - Re: [PATCH] eventfd: use wait_event_interruptible_locked

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Date:   Thu, 16 Feb 2023 13:33:03 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     wenyang.linux@...mail.com
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>, Dylan Yudaken <dylany@...com>,
        Jens Axboe <axboe@...nel.dk>,
        David Woodhouse <dwmw@...zon.co.uk>, Fu Wei <wefu@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Michal Nazarewicz <m.nazarewicz@...sung.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eventfd: use wait_event_interruptible_locked_irq() helper

On Thu, Feb 16, 2023 at 01:29:00PM +0000, Matthew Wilcox wrote:
> On Thu, Feb 16, 2023 at 09:17:39PM +0800, wenyang.linux@...mail.com wrote:
> > +		res = wait_event_interruptible_locked_irq(
> > +				ctx->wqh, ULLONG_MAX - ctx->count > ucnt) ?
> > +			-ERESTARTSYS : sizeof(ucnt);
> 
> You've broken the line here in a weird way.  I'd've done it as:
> 
> 		res = wait_event_interruptible_locked_irq(ctx->wqh,
> 				ULLONG_MAX - ctx->count > ucnt) ?
> 					-ERESTARTSYS : sizeof(ucnt));
> 
> ... also the patch you've sent here doesn't even compile.  Have you
> tested it?

Sorry, I misread it.  But I would have avoided use of the ?: operator
here ...

		res = wait_event_interruptible_locked_irq(ctx->wqh,
				ULLONG_MAX - ctx->count > ucnt);
		if (res == 0)
			res = sizeof(ucnt);