Linux kernel, wifi hack, security & Golang

GCC项目组织宣布， 允许gccgo(Google 推出的新语言GO)增加到gcc的主分支，更详细的信息可能要在GCC4.5或之后的版本中体现。 也就是说在不远的将来GO语言将是Linux的标配。

GO语言: http://www.golang.org

GO中文资料参考: http://golang-china.org

GO中文用户组: https://groups.google.com/group/golang-china/

想通过codeviz看linux kernel的调用关系, 但是codeviz用的是gcc-3.4.6,

但在用gcc-3.4.6编译linux-2.6.30的时候报错:

 drivers/net/igb/igb_main.c: In function `igb_up':
 drivers/net/igb/igb_main.c:130: sorry, unimplemented: inlining failed
 in call to 'igb_set_rah_pool': function body not available
 drivers/net/igb/igb_main.c:938: sorry, unimplemented: called from here
 drivers/net/igb/igb_main.c:133: sorry, unimplemented: inlining failed
 in call to 'igb_set_vmolr': function body not available
 drivers/net/igb/igb_main.c:939: sorry, unimplemented: called from here
 make[3]: *** [drivers/net/igb/igb_main.o] Error 1
 make[2]: *** [drivers/net/igb] Error 2
 make[1]: *** [drivers/net] Error 2
 make: *** [drivers] Error 2
 
 This is CentOS 4.x system.  While using same configuration to compile
 in CentOS 5.x systems with gcc-4.1.2 do not encounter such error and
 my guess is gcc version issue?  Any idea?

Linux-2.6.30 Linux-2.6.30.1使用gcc-3.4.6编译错误补丁:

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index be48029..adb09d3 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -127,14 +127,48 @@  static void igb_restore_vlan(struct igb_adapter *);
 static void igb_ping_all_vfs(struct igb_adapter *);
 static void igb_msg_task(struct igb_adapter *);
 static int igb_rcv_msg_from_vf(struct igb_adapter *, u32);
-static inline void igb_set_rah_pool(struct e1000_hw *, int , int);
 static void igb_set_mc_list_pools(struct igb_adapter *, int, u16);
 static void igb_vmm_control(struct igb_adapter *);
-static inline void igb_set_vmolr(struct e1000_hw *, int);
-static inline int igb_set_vf_rlpml(struct igb_adapter *, int, int);
 static int igb_set_vf_mac(struct igb_adapter *adapter, int, unsigned char *);
 static void igb_restore_vf_multicasts(struct igb_adapter *adapter);

+static inline void igb_set_vmolr(struct e1000_hw *hw, int vfn)
+{
+	u32 reg_data;
+
+	reg_data = rd32(E1000_VMOLR(vfn));
+	reg_data |= E1000_VMOLR_BAM |	 /* Accept broadcast */
+	            E1000_VMOLR_ROPE |   /* Accept packets matched in UTA */
+	            E1000_VMOLR_ROMPE |  /* Accept packets matched in MTA */
+	            E1000_VMOLR_AUPE |   /* Accept untagged packets */
+	            E1000_VMOLR_STRVLAN; /* Strip vlan tags */
+	wr32(E1000_VMOLR(vfn), reg_data);
+}
+
+static inline int igb_set_vf_rlpml(struct igb_adapter *adapter, int size,
+                                 int vfn)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	u32 vmolr;
+
+	vmolr = rd32(E1000_VMOLR(vfn));
+	vmolr &= ~E1000_VMOLR_RLPML_MASK;
+	vmolr |= size | E1000_VMOLR_LPE;
+	wr32(E1000_VMOLR(vfn), vmolr);
+
+	return 0;
+}
+
+static inline void igb_set_rah_pool(struct e1000_hw *hw, int pool, int entry)
+{
+	u32 reg_data;
+
+	reg_data = rd32(E1000_RAH(entry));
+	reg_data &= ~E1000_RAH_POOL_MASK;
+	reg_data |= E1000_RAH_POOL_1 << pool;;
+	wr32(E1000_RAH(entry), reg_data);
+}
+
 #ifdef CONFIG_PM
 static int igb_suspend(struct pci_dev *, pm_message_t);
 static int igb_resume(struct pci_dev *);
@@ -5418,43 +5452,6 @@  static void igb_io_resume(struct pci_dev *pdev)
 	igb_get_hw_control(adapter);
 }

-static inline void igb_set_vmolr(struct e1000_hw *hw, int vfn)
-{
-	u32 reg_data;
-
-	reg_data = rd32(E1000_VMOLR(vfn));
-	reg_data |= E1000_VMOLR_BAM |	 /* Accept broadcast */
-	            E1000_VMOLR_ROPE |   /* Accept packets matched in UTA */
-	            E1000_VMOLR_ROMPE |  /* Accept packets matched in MTA */
-	            E1000_VMOLR_AUPE |   /* Accept untagged packets */
-	            E1000_VMOLR_STRVLAN; /* Strip vlan tags */
-	wr32(E1000_VMOLR(vfn), reg_data);
-}
-
-static inline int igb_set_vf_rlpml(struct igb_adapter *adapter, int size,
-                                 int vfn)
-{
-	struct e1000_hw *hw = &adapter->hw;
-	u32 vmolr;
-
-	vmolr = rd32(E1000_VMOLR(vfn));
-	vmolr &= ~E1000_VMOLR_RLPML_MASK;
-	vmolr |= size | E1000_VMOLR_LPE;
-	wr32(E1000_VMOLR(vfn), vmolr);
-
-	return 0;
-}
-
-static inline void igb_set_rah_pool(struct e1000_hw *hw, int pool, int entry)
-{
-	u32 reg_data;
-
-	reg_data = rd32(E1000_RAH(entry));
-	reg_data &= ~E1000_RAH_POOL_MASK;
-	reg_data |= E1000_RAH_POOL_1 << pool;;
-	wr32(E1000_RAH(entry), reg_data);
-}
-
 static void igb_set_mc_list_pools(struct igb_adapter *adapter,
 				  int entry_count, u16 total_rar_filters)
 {

参考:
1. linux-2.6.30.1 with gcc-3.4.6 compile error http://patchwork.kernel.org/patch/35402/
2. codeviz http://www.csn.ul.ie/~mel/projects/codeviz/