linux-kernel - [PATCH 3.8 59/81] sparc64: Fix ITLB handler of null page

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Message-Id: <1383069882-11437-60-git-send-email-kamal@canonical.com>
Date:	Tue, 29 Oct 2013 11:04:20 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Kirill Tkhai <tkhai@...dex.ru>, David Miller <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 59/81] sparc64: Fix ITLB handler of null page

3.8.13.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kirill Tkhai <tkhai@...dex.ru>

[ Upstream commit 1c2696cdaad84580545a2e9c0879ff597880b1a9 ]

1)Use kvmap_itlb_longpath instead of kvmap_dtlb_longpath.

2)Handle page #0 only, don't handle page #1: bleu -> blu

 (KERNBASE is 0x400000, so #1 does not exist too. But everything
  is possible in the future. Fix to not to have problems later.)

3)Remove unused kvmap_itlb_nonlinear.

Signed-off-by: Kirill Tkhai <tkhai@...dex.ru>
CC: David Miller <davem@...emloft.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/sparc/kernel/ktlb.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S
index 0746e5e..fde5a41 100644
--- a/arch/sparc/kernel/ktlb.S
+++ b/arch/sparc/kernel/ktlb.S
@@ -25,11 +25,10 @@ kvmap_itlb:
 	 */
 kvmap_itlb_4v:
 
-kvmap_itlb_nonlinear:
 	/* Catch kernel NULL pointer calls.  */
 	sethi		%hi(PAGE_SIZE), %g5
 	cmp		%g4, %g5
-	bleu,pn		%xcc, kvmap_dtlb_longpath
+	blu,pn		%xcc, kvmap_itlb_longpath
 	 nop
 
 	KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_itlb_load)
-- 
1.8.1.2

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