Re: [PATCH v2 02/10] KVM: selftests: simplify setup_demand_paging error handling

[Paolo Bonzini]

On 20/05/21 00:14, Axel Rasmussen wrote:
> On Wed, May 19, 2021 at 2:45 PM Ben Gardon <bgardon@xxxxxxxxxx> wrote:
> > On Wed, May 19, 2021 at 1:03 PM Axel Rasmussen <axelrasmussen@xxxxxxxxxx> wrote:
> > > A small cleanup. Our caller writes:
> > >
> > >    r = setup_demand_paging(...);
> > >    if (r < 0) exit(-r);
> > >
> > > Since we're just going to exit anyway, instead of returning an error we
> > > can just re-use TEST_ASSERT. This makes the caller simpler, as well as
> > > the function itself - no need to write our branches, etc.
> > >
> > > Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
> > > ---
> > >   .../selftests/kvm/demand_paging_test.c        | 51 +++++++------------
> > >   1 file changed, 19 insertions(+), 32 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
> > > index 9398ba6ef023..601a1df24dd2 100644
> > > --- a/tools/testing/selftests/kvm/demand_paging_test.c
> > > +++ b/tools/testing/selftests/kvm/demand_paging_test.c
> > > @@ -9,6 +9,8 @@
> > >
> > >   #define _GNU_SOURCE /* for pipe2 */
> > >
> > > +#include <inttypes.h>
> > > +#include <stdint.h>
> >
> > Why do the includes need to change in this commit? Is it for the PRIu64 below?
>
> Right, I didn't actually try compiling without these, but inttypes.h
> defines PRIu64 and stdint.h defines uint64_t. In general I tend to
> prefer including things like this because we're using their
> definitions directly, even if we might be picking them up transiently
> some other way.

inttypes.h is defined to include stdint.h (stdint.h is mostly useful in 
freestanding environments and is usually provided by the C compiler, 
while inttypes.h is provided by libc).

Paolo