From 26c23e0e650ca70f546ccada1b302c6e3b5a8425 Mon Sep 17 00:00:00 2001
From: fslongjin <fslongjin@vip.qq.com>
Date: Thu, 10 Feb 2022 14:01:43 +0800
Subject: [PATCH] =?UTF-8?q?:bug:=20=E4=BF=AE=E5=A4=8D=E4=BA=86=E7=89=A9?=
 =?UTF-8?q?=E7=90=86=E9=A1=B5=E5=88=86=E9=85=8D=E6=97=B6=EF=BC=8C=E8=B5=B7?=
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---
 kernel/mm/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/mm/mm.c b/kernel/mm/mm.c
index 2c67c2f2..774e49c3 100644
--- a/kernel/mm/mm.c
+++ b/kernel/mm/mm.c
@@ -300,7 +300,7 @@ struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
                 // 寻找连续num个空页
                 if (!(((*p >> k) | (*(p + 1) << (64 - k))) & (num == 64 ? 0xffffffffffffffffUL : ((1UL << num) - 1))))
                 {
-                    ul start_page_num = j + k - 1; // 计算得到要开始获取的内存页的页号（书上的公式有问题，这个是改过之后的版本）
+                    ul start_page_num = j + k - shift; // 计算得到要开始获取的内存页的页号（书上的公式有问题，这个是改过之后的版本）
                     for (ul l = 0; l < num; ++l)
                     {
                         struct Page *x = memory_management_struct.pages_struct + start_page_num + l;