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* devpts "upcalls" eliminated.
* instead of playing games with revalidation we simply use
ramfs-style tree and kill dentries upon devpts_pty_kill(). That
allows to get rid of a lot of code in fs/devpts/*.c.
* devpts_fs.h cleaned up.
* devpts/root.c and devpts/devpts_i.h removed.
* array of pointers to devpts inodes killed; with ramfs-style tree
it's not needed anymore.
* devpts/inode.c cleaned up.
* devpts_pty_new() used to get mk_kdev() only to convert it to
dev_t (hardly a surprise, since it's mknod() in disguise). Now it gets
dev_t as an argument.
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