linux-kernel - What's this __dummy in asm-cris/bitops.h?

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Message-ID: <47697761.1090702@anagramm.de>
Date:	Wed, 19 Dec 2007 20:56:17 +0100
From:	Clemens Koller <clemens.koller@...gramm.de>
To:	LKML List <linux-kernel@...r.kernel.org>
Subject: What's this __dummy in asm-cris/bitops.h?

Hello,

while looking for some assembly out of order / optimization stuff
for something else, I found some strange code in
.../linux/include/asm-cris/bitops.h:22

/*
* Some hacks to defeat gcc over-optimizations..
*/
struct __dummy { unsigned long a[100]; };
#define ADDR (*(struct __dummy *) addr)
#define CONST_ADDR (*(const struct __dummy *) addr)

CONST_ADDR is never used in the kernel.
Maybe some -cris people could have a look.

Thanks,
-- 
Clemens Koller
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