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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
34 lines
1.0 KiB
Diff
34 lines
1.0 KiB
Diff
From fa27f3e27863e3f4376864b144dc7506de124cf6 Mon Sep 17 00:00:00 2001
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From: Jason Jin <Jason.jin@freescale.com>
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Date: Thu, 4 Aug 2011 09:59:54 +0800
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Subject: [PATCH 43/52] workaround for zero page used on ColdFire platform.
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There is some issue for Coldfire platform to use the
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zero page for read when there is memory fault. This is
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a workaround for this, try to make kernel to use normal
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memory instead.
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Signed-off-by: Jason Jin <Jason.jin@freescale.com>
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---
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mm/memory.c | 2 ++
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1 files changed, 2 insertions(+), 0 deletions(-)
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--- a/mm/memory.c
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+++ b/mm/memory.c
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@@ -2937,6 +2937,7 @@ static int do_anonymous_page(struct mm_s
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if (check_stack_guard_page(vma, address) < 0)
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return VM_FAULT_SIGBUS;
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+#ifndef CONFIG_COLDFIRE
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/* Use the zero-page for reads */
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if (!(flags & FAULT_FLAG_WRITE)) {
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entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
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@@ -2946,6 +2947,7 @@ static int do_anonymous_page(struct mm_s
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goto unlock;
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goto setpte;
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}
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+#endif
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/* Allocate our own private page. */
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if (unlikely(anon_vma_prepare(vma)))
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