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

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Message-ID: <20180426103304.GA4639@infradead.org>
Date:   Thu, 26 Apr 2018 03:33:04 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     dsterba@...e.cz, Alexey Dobriyan <adobriyan@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: use #pragma once

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?