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The virtual address space argument of clear_user_highpage is supposed to be the virtual address where the page being cleared will eventually be mapped. This allows architectures with virtually indexed caches a few clever tricks. That sort of trick falls over in painful ways if the virtual address argument is wrong. Signed-off-by: Ralf Baechle <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>