From: David S. Miller <davem@davemloft.net>
Date: Wed, 20 Feb 2013 20:38:40 +0000 (-0800)
Subject: sparc64: Fix huge PMD to PTE translation for sun4u in TLB miss handler.
X-Git-Tag: v3.9-rc1~140^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76968ad2eac6456270353de168b21f04f4b3d1d3;p=pandora-kernel.git

sparc64: Fix huge PMD to PTE translation for sun4u in TLB miss handler.

When we set the sun4u version of the PTE execute bit, it's:

	or	REG, _PAGE_EXEC_4U, REG

_PAGE_EXEC_4U is 0x1000, unfortunately the immedate field of the
'or' instruction is a signed 13-bit value.  So the above actually
assembles into:

	or	REG, -4096, REG

completely corrupting the final PTE value.

Set it with a:

	sethi	%hi(_PAGE_EXEC_4U), TMP
	or	REG, TMP, REG

sequence instead.

This fixes "git gc" crashes on sun4u machines.

Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
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