asm-generic: page.h: Remove useless get_user_page and free_user_page
They are not symmetric with each other, neither are used in real world (can not be found by grep command in source code root directory), so remove them. Signed-off-by: NChen Gang <gang.chen.5i5j@gmail.com> Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk> Acked-by: NGreg Ungerer <gerg@uclinux.org> Signed-off-by: NArnd Bergmann <arnd@arndb.de>
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