From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: linux-mm@kvack.org, akpm@osdl.org
Subject: [PATCH] Fix index calculations in clear_page_range.
Date: Tue, 11 Jan 2005 19:24:11 +0100 [thread overview]
Message-ID: <20050111182411.GA6055@mschwid3.boeblingen.de.ibm.com> (raw)
[PATCH] Fix index calculations in clear_page_range.
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
pgd_index(end + PGDIR_SIZE - 1) returns 0 if end + PGDIR_SIZE - 1
is beyond the end of the address space.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diffstat:
mm/memory.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff -urN linux-2.6/mm/memory.c linux-2.6-patched/mm/memory.c
--- linux-2.6/mm/memory.c 2005-01-11 19:10:54.000000000 +0100
+++ linux-2.6-patched/mm/memory.c 2005-01-11 19:11:01.000000000 +0100
@@ -190,10 +190,10 @@
void clear_page_range(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
unsigned long addr = start, next;
- unsigned long i, nr = pgd_index(end + PGDIR_SIZE-1) - pgd_index(start);
pgd_t * pgd = pgd_offset(tlb->mm, start);
+ unsigned long i;
- for (i = 0; i < nr; i++) {
+ for (i = pgd_index(start); i <= pgd_index(end-1); i++) {
next = (addr + PGDIR_SIZE) & PGDIR_MASK;
if (next > end || next <= addr)
next = end;
--
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reply other threads:[~2005-01-11 18:25 UTC|newest]
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