Build failure on latest powerpc/merge (311ae9e159d8 io_uring: fix dead-hung for non-iter fixed rw)

[Christophe Leroy]

   CC      fs/io_uring.o
fs/io_uring.c: In function ‘loop_rw_iter’:
fs/io_uring.c:1628:21: error: implicit declaration of function ‘kmap’ 
[-Werror=implicit-function-declaration]
     iovec.iov_base = kmap(iter->bvec->bv_page)
                      ^
fs/io_uring.c:1628:19: warning: assignment makes pointer from integer 
without a cast [-Wint-conversion]
     iovec.iov_base = kmap(iter->bvec->bv_page)
                    ^
fs/io_uring.c:1643:4: error: implicit declaration of function ‘kunmap’ 
[-Werror=implicit-function-declaration]
     kunmap(iter->bvec->bv_page);
     ^


Reverting commit 311ae9e159d8 ("io_uring: fix dead-hung for non-iter 
fixed rw") clears the failure.

Most likely an #include is missing.


Christophe