o3能运行

kernel/mm/slab.c

@@ -1,6 +1,8 @@
 #include "slab.h"
 #include <common/compiler.h>
 
+#pragma GCC push_options
+#pragma GCC optimize("O0")
 struct slab kmalloc_cache_group[16] =
     {
         {32, 0, 0, NULL, NULL, NULL, NULL},
@@ -348,9 +350,9 @@ ul slab_init()
     kinfo("Initializing SLAB...");
     // 将slab的内存池空间放置在mms的后方
     ul tmp_addr = memory_management_struct.end_of_struct;
-
     for (int i = 0; i < 16; ++i)
     {
+        io_mfence();
         spin_init(&kmalloc_cache_group[i].lock);
         // 将slab内存池对象的空间放置在mms的后面，并且预留4个unsigned long 的空间以防止内存越界
         kmalloc_cache_group[i].cache_pool_entry = (struct slab_obj *)memory_management_struct.end_of_struct;
@@ -370,7 +372,7 @@ ul slab_init()
 
         // bmp后方预留4个unsigned long的空间防止内存越界,且按照8byte进行对齐
         memory_management_struct.end_of_struct = (ul)(memory_management_struct.end_of_struct + kmalloc_cache_group[i].cache_pool_entry->bmp_len + (sizeof(ul) << 2)) & (~(sizeof(ul) - 1));
-
+        io_mfence();
         // @todo：此处可优化，直接把所有位设置为0，然后再对部分不存在对应的内存对象的位设置为1
         memset(kmalloc_cache_group[i].cache_pool_entry->bmp, 0xff, kmalloc_cache_group[i].cache_pool_entry->bmp_len);
         for (int j = 0; j < kmalloc_cache_group[i].cache_pool_entry->bmp_count; ++j)
@@ -378,6 +380,7 @@ ul slab_init()
 
         kmalloc_cache_group[i].count_total_using = 0;
         kmalloc_cache_group[i].count_total_free = kmalloc_cache_group[i].cache_pool_entry->count_free;
+        io_mfence();
     }
 
     struct Page *page = NULL;
@@ -388,13 +391,17 @@ ul slab_init()
     ul page_num = 0;
     for (int i = PAGE_2M_ALIGN(virt_2_phys(tmp_addr)) >> PAGE_2M_SHIFT; i <= tmp_page_mms_end; ++i)
     {
+
         page = memory_management_struct.pages_struct + i;
         page_num = page->addr_phys >> PAGE_2M_SHIFT;
         *(memory_management_struct.bmp + (page_num >> 6)) |= (1UL << (page_num % 64));
         ++page->zone->count_pages_using;
+        io_mfence();
         --page->zone->count_pages_free;
         page_init(page, PAGE_KERNEL_INIT | PAGE_KERNEL | PAGE_PGT_MAPPED);
+
     }
+    io_mfence();
 
     // 为slab内存池对象分配内存空间
     ul *virt = NULL;
@@ -406,8 +413,11 @@ ul slab_init()
         page = Virt_To_2M_Page(virt);
 
         page_num = page->addr_phys >> PAGE_2M_SHIFT;
+
         *(memory_management_struct.bmp + (page_num >> 6)) |= (1UL << (page_num % 64));
+
         ++page->zone->count_pages_using;
+        io_mfence();    // 该位置必须加一个mfence，否则O3优化运行时会报错
         --page->zone->count_pages_free;
         page_init(page, PAGE_PGT_MAPPED | PAGE_KERNEL | PAGE_KERNEL_INIT);
 
@@ -696,4 +706,5 @@ unsigned long kfree(void *address)
     }
     kBUG("kfree(): Can't free memory.");
     return ECANNOT_FREE_MEM;
-}
+}
+#pragma GCC pop_options