From: Vineet Gupta <vgupta@synopsys.com>
Date: Wed, 22 May 2013 13:08:10 +0000 (+0530)
Subject: ARC: Brown paper bag bug in macro for checking cache color
X-Git-Tag: v3.10-rc3~10^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e87974dec5ec25a8a4852d9292db6be659164e6;p=pandora-kernel.git

ARC: Brown paper bag bug in macro for checking cache color

The VM_EXEC check in update_mmu_cache() was getting optimized away
because of a stupid error in definition of macro addr_not_cache_congruent()

The intention was to have the equivalent of following:

	if (a || (1 ? b : 0))

but we ended up with following:

	if (a || 1 ? b : 0)

And because precedence of '||' is more that that of '?', gcc was optimizing
away evaluation of <a>

Nasty Repercussions:
1. For non-aliasing configs it would mean some extraneous dcache flushes
   for non-code pages if U/K mappings were not congruent.
2. For aliasing config, some needed dcache flush for code pages might
   be missed if U/K mappings were congruent.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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