驅動程式 - Linux Device Driver(LDD) - 如何取得API Function在Kernel版本的變動

參考資訊：
https://github.com/torvalds/linux

例如：找尋vfs_getxattr()在所有Kernel版本的變動

$ cd
$ git clone https://github.com/torvalds/linux
$ cd linux
$ git tag > /tmp/tag
$ echo "" > /tmp/diff
$ cat /tmp/tag | awk '{print "echo "$1" >> /tmp/diff && git reset --hard && git clean -f -d && git checkout "$1" && grep \" vfs_getxattr(\" include/linux -r >> /tmp/diff"}' | sh
$ cat /tmp/diff | sort -n | uniq -c | grep vfs_
         82 include/linux/xattr.h:ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);
    574 include/linux/xattr.h:ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
     49 include/linux/xattr.h:ssize_t vfs_getxattr(struct mnt_idmap *, struct dentry *, const char *,
     94 include/linux/xattr.h:ssize_t vfs_getxattr(struct user_namespace *, struct dentry *, const char *,

P.S. 在/tmp/diff檔案找尋變動的區間即可知道從哪個Kernel版號開始變動