linux-kernel - Re: [PATCH] proc: use #pragma once

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Message-ID: <20180426192538.GB4919@avx2>
Date:   Thu, 26 Apr 2018 22:25:38 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dsterba@...e.cz, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: use #pragma once

On Thu, Apr 26, 2018 at 03:33:04AM -0700, Christoph Hellwig wrote:
> On Thu, Apr 26, 2018 at 12:26:29PM +0200, David Sterba wrote:
> > There are about 20k header files, none of them has #pragma once.
> > Updating that will bring many unnesessry git commits.
> > 
> > I doubt that one more define in preprocessor tables is a problem we
> > should fix. The LOC argument also does not sound very convincing. The
> > include protection is at the top of the file, not mixed among other
> > code. Replacing 2-3 lines with one will be barely noticeable.
> 
> Let's put it another way:  does this make any noticable difference
> for compile times?

Should be the same as include guard pattern is recognized and becomes
#pragma once internally.