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

[Geert Uytterhoeven]

Hi Jens,

On Fri, Nov 29, 2019 at 5:06 PM Jens Axboe <axboe at kernel.dk> wrote:
> On 11/29/19 6:53 AM, Christophe Leroy wrote:
> >     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.
>
> Huh weird how the build bots didn't catch that. Does the below work?

Thanks, this fixes the same issue on SuperH:

Tested-by: Geert Uytterhoeven <geert+renesas at glider.be>

> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -69,6 +69,7 @@
>   #include <linux/nospec.h>
>   #include <linux/sizes.h>
>   #include <linux/hugetlb.h>
> +#include <linux/highmem.h>
>
>   #define CREATE_TRACE_POINTS
>   #include <trace/events/io_uring.h>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds