linux-kernel - [PATCH 3/2] mm/remap_pfn_range: restore missing flush

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Date:	Thu, 13 Nov 2008 12:13:35 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: [PATCH 3/2] mm/remap_pfn_range: restore missing flush

Restore the cache flush and BUG_ON removed in the conversion to using
apply_to_page_range().

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...ix.com>
Cc: Johannes Weiner <hannes@...xchg.org>
---
 mm/memory.c |    4 ++++
 1 file changed, 4 insertions(+)

===================================================================
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1484,6 +1484,8 @@
 	struct remap_data *rmd = data;
 	pte_t pte = pte_mkspecial(pfn_pte(rmd->pfn++, rmd->prot));
 
+	BUG_ON(!pte_none(*ptep));
+
 	set_pte_at(rmd->mm, addr, ptep, pte);
 
 	return 0;
@@ -1535,6 +1537,8 @@
 
 	BUG_ON(addr >= end);
 
+	flush_cache_range(vma, addr, end);
+
 	rmd.mm = mm;
 	rmd.pfn = pfn;
 	rmd.prot = prot;


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