Revert "mm/filemap: fix build error, declaration of var is non-static somewhere else"

This reverts commit 746e5d797051f3ce3f1910fb85c6438d4f9074bc.

Signed-off-by: zwliew <zhaoweiliew@gmail.com>
Revert "fs: pull iov_iter use higher up the stack"

This reverts commit e1a310072c558a2854de2b5602fbc542ec0277be.

Signed-off-by: zwliew <zhaoweiliew@gmail.com>
Revert "tmpfs: add support for read_iter and write_iter"

This reverts commit 77cd2d794681920ad4513f082aba9687ef1ae974.

Signed-off-by: zwliew <zhaoweiliew@gmail.com>