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

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