linux-kernel - [PATCH] powerpc 8xx: Fixing issue with CONFIG_PIN

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Message-Id: <201309111644.r8BGiuDZ016325@localhost.localdomain>
Date:	Wed, 11 Sep 2013 18:44:56 +0200
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Subject: [PATCH] powerpc 8xx: Fixing issue with CONFIG_PIN_TLB

Activating CONFIG_PIN_TLB is supposed to pin the IMMR and the first three
8Mbytes pages. But the setting of the MD_CTR was missing so as the index is
decremented every DTLB update, the pinning of the third 8Mbytes page was
overwriting the DTLB entry for IMMR.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

diff -ur linux-3.11.org/arch/powerpc/kernel/head_8xx.S linux-3.11/arch/powerpc/kernel/head_8xx.S
--- linux-3.11.org/arch/powerpc/kernel/head_8xx.S	2013-09-02 22:46:10.000000000 +0200
+++ linux-3.11/arch/powerpc/kernel/head_8xx.S	2013-09-09 11:28:54.000000000 +0200
@@ -862,6 +862,9 @@
 	addis	r11, r11, 0x0080	/* Add 8M */
 	mtspr	SPRN_MD_RPN, r11
 
+	addi	r10, r10, 0x0100
+	mtspr	SPRN_MD_CTR, r10
+
 	addis	r8, r8, 0x0080		/* Add 8M */
 	mtspr	SPRN_MD_EPN, r8
 	mtspr	SPRN_MD_TWC, r9
--
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