linux-kernel - [PATCH 1/2] MN10300: Don't set the dirty bit in the DTLB entries in the TLB-miss handler

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Message-ID: <20090611120832.16989.99883.stgit@warthog.procyon.org.uk>
Date:	Thu, 11 Jun 2009 13:08:32 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-am33-list@...hat.com,
	David Howells <dhowells@...hat.com>
Subject: [PATCH 1/2] MN10300: Don't set the dirty bit in the DTLB entries in
	the TLB-miss handler

Remove the special handling for the Data TLB entry dirty bit in the TLB-miss
handler.  As the code stands, all that it does is to cause us to take a second
data address exception to set the dirty bit.  Instead, we can just let
pte_mkdirty() set the bit.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 arch/mn10300/mm/tlb-mn10300.S |   18 ------------------
 1 files changed, 0 insertions(+), 18 deletions(-)


diff --git a/arch/mn10300/mm/tlb-mn10300.S b/arch/mn10300/mm/tlb-mn10300.S
index 7892080..7095147 100644
--- a/arch/mn10300/mm/tlb-mn10300.S
+++ b/arch/mn10300/mm/tlb-mn10300.S
@@ -165,24 +165,6 @@ ENTRY(itlb_aerror)
 ENTRY(dtlb_aerror)
 	and	~EPSW_NMID,epsw
 	add	-4,sp
-	mov	d1,(sp)
-
-	movhu	(MMUFCR_DFC),d1			# is it the initial valid write
-						# to this page?
-	and	MMUFCR_xFC_INITWR,d1
- 	beq	dtlb_pagefault			# jump if not
-
-	mov	(DPTEL),d1			# set the dirty bit
-						# (don't replace with BSET!)
-	or	_PAGE_DIRTY,d1
-	mov	d1,(DPTEL)
-	mov	(sp),d1
-	add	4,sp
- 	rti
-
-	ALIGN
-dtlb_pagefault:
-	mov	(sp),d1
 	SAVE_ALL
 	add	-4,sp				# need to pass three params
 

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