 - Synchronize access to a page's valid field in vfs_bio_clrbuf()    by using the lock from its containing object.  - Remove GIANT_REQUIRED from vm_hold_load_pages().
 - Synchronize access to a page's valid field in vfs_bio_clrbuf()
   by using the lock from its containing object.
 - Remove GIANT_REQUIRED from vm_hold_load_pages().

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