kabi: fix split error of kABI reference checking tool

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JZ0H
CVE: NA

-------------------------------

Use the kABI reference checking tool as follows:

  ./scripts/check-kabi -k Module.symvers.baseline -s Module.symvers

A python error occurred, and the following traceback is printed:

Traceback (most recent call last):
  File "./scripts/check-kabi", line 144, in <module>
    load_symvers(symvers,symvers_file)
  File "./scripts/check-kabi", line 45, in load_symvers
    checksum,symbol,directory,type = string.split(in_line)
ValueError: too many values to unpack

It is because the Module.symvers file change its line format in
the following commits, and the namespace field may be empty:
cb9b55d2 ("modpost: add support for symbol namespaces")
5190044c ("modpost: move the namespace field in Module.symvers last")

In order to solve this problem, use '\t' to split each line and
add a variable to save namespace.

Fixes: 9fc7fbaf ("kabi: add kABI reference checking tool")
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

scripts/check-kabi

@@ -42,7 +42,7 @@ def load_symvers(symvers,filename):
 			break
 		if in_line == "\n":
 			continue
-		checksum,symbol,directory,type = string.split(in_line)
+		checksum,symbol,directory,type,namespace = string.split(in_line, sep='\t')
 
 		symvers[symbol] = in_line[0:-1]
 
@@ -57,7 +57,7 @@ def load_kabi(kabi,filename):
 			break
 		if in_line == "\n":
 			continue
-		checksum,symbol,directory,type = string.split(in_line)
+		checksum,symbol,directory,type,namespace = string.split(in_line, sep='\t')
 
 		kabi[symbol] = in_line[0:-1]
 
@@ -70,9 +70,9 @@ def check_kabi(symvers,kabi):
 	moved_symbols=[]
 
 	for symbol in kabi:
-		abi_hash,abi_sym,abi_dir,abi_type = string.split(kabi[symbol])
+		abi_hash,abi_sym,abi_dir,abi_type,namespace = string.split(kabi[symbol], sep='\t')
 		if symvers.has_key(symbol):
-			sym_hash,sym_sym,sym_dir,sym_type = string.split(symvers[symbol])
+			sym_hash,sym_sym,sym_dir,sym_type,namespace = string.split(symvers[symbol], sep='\t')
 			if abi_hash != sym_hash:
 				fail=1
 				changed_symbols.append(symbol)