From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-mm mailing list <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: remap_pte_range
Date: Tue, 29 Jun 2004 17:17:24 -0700 [thread overview]
Message-ID: <65600000.1088554644@flay> (raw)
I have no idea what remap_pte_range is trying to do here, but what it
is doing makes no sense (to me at least).
If the pfn is not valid, we CANNOT safely call PageReserved on it -
the *page returned from pfn_to_page is bullshit, and we crash deref'ing
it.
Perhaps this was what it was trying to do? Not sure.
diff -purN -X /home/mbligh/.diff.exclude virgin/mm/memory.c remap_pte_range/mm/memory.c
--- virgin/mm/memory.c 2004-06-16 10:22:15.000000000 -0700
+++ remap_pte_range/mm/memory.c 2004-06-29 17:15:35.000000000 -0700
@@ -908,7 +908,7 @@ static inline void remap_pte_range(pte_t
pfn = phys_addr >> PAGE_SHIFT;
do {
BUG_ON(!pte_none(*pte));
- if (!pfn_valid(pfn) || PageReserved(pfn_to_page(pfn)))
+ if (pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
set_pte(pte, pfn_pte(pfn, prot));
address += PAGE_SIZE;
pfn++;
--
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next reply other threads:[~2004-06-30 0:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-30 0:17 Martin J. Bligh [this message]
2004-06-30 0:30 ` remap_pte_range Andrew Morton
2004-06-30 6:44 ` remap_pte_range Martin J. Bligh
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