| 1 | From fa27f3e27863e3f4376864b144dc7506de124cf6 Mon Sep 17 00:00:00 2001 |
| 2 | From: Jason Jin <Jason.jin@freescale.com> |
| 3 | Date: Thu, 4 Aug 2011 09:59:54 +0800 |
| 4 | Subject: [PATCH 43/52] workaround for zero page used on ColdFire platform. |
| 5 | |
| 6 | There is some issue for Coldfire platform to use the |
| 7 | zero page for read when there is memory fault. This is |
| 8 | a workaround for this, try to make kernel to use normal |
| 9 | memory instead. |
| 10 | |
| 11 | Signed-off-by: Jason Jin <Jason.jin@freescale.com> |
| 12 | --- |
| 13 | mm/memory.c | 2 ++ |
| 14 | 1 files changed, 2 insertions(+), 0 deletions(-) |
| 15 | |
| 16 | --- a/mm/memory.c |
| 17 | +++ b/mm/memory.c |
| 18 | @@ -2937,6 +2937,7 @@ static int do_anonymous_page(struct mm_s |
| 19 | if (check_stack_guard_page(vma, address) < 0) |
| 20 | return VM_FAULT_SIGBUS; |
| 21 | |
| 22 | +#ifndef CONFIG_COLDFIRE |
| 23 | /* Use the zero-page for reads */ |
| 24 | if (!(flags & FAULT_FLAG_WRITE)) { |
| 25 | entry = pte_mkspecial(pfn_pte(my_zero_pfn(address), |
| 26 | @@ -2946,6 +2947,7 @@ static int do_anonymous_page(struct mm_s |
| 27 | goto unlock; |
| 28 | goto setpte; |
| 29 | } |
| 30 | +#endif |
| 31 | |
| 32 | /* Allocate our own private page. */ |
| 33 | if (unlikely(anon_vma_prepare(vma))) |
| 34 | |
