From: AceVest <zhaoyanbai@126.com>
Date: Mon, 28 Jul 2014 15:24:03 +0000 (+0800)
Subject: fix bug in put_paging
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=c8746ff216cf1340e3bf825b6a95e8f97e5793b1;p=kernel.git

fix bug in put_paging
---

diff --git a/kernel/fork.c b/kernel/fork.c
index ee74d85..a6d2eb5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -78,8 +78,17 @@ int do_fork(pt_regs_t *regs, unsigned long flags)
                 pte_src[j] &= ~PAGE_WR;
                 pte_dst[j] = pte_src[j];
 
+                if(pte_src[j] == 0)
+                    continue;
+                printk("----pde[%u] pte_src[%u] %08x\n", i, j, pte_src[j]);
                 page_t *page = pa2page(pte_src[j]);
                 page->count ++;
+                //assert(page->count <= 1);
+                if(page->count > 1)
+                {
+                    printk("page %08x count %d\n", page, page->count);
+                    panic("----");
+                }
             }
 
         }