linux-kernel - Re: [PATCH v2 02/10] KVM: selftests: simplify setup_demand

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Date:   Mon, 24 May 2021 15:25:25 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
Cc:     Aaron Lewis <aaronlewis@...gle.com>,
        Alexander Graf <graf@...zon.com>,
        Andrew Jones <drjones@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Xu <jacobhxu@...gle.com>,
        Makarand Sonare <makarandsonare@...gle.com>,
        Oliver Upton <oupton@...gle.com>, Peter Xu <peterx@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Yanan Wang <wangyanan55@...wei.com>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 02/10] KVM: selftests: simplify setup_demand_paging
 error handling

On 20/05/21 00:14, Axel Rasmussen wrote:
> On Wed, May 19, 2021 at 2:45 PM Ben Gardon <bgardon@...gle.com> wrote:
>>
>> On Wed, May 19, 2021 at 1:03 PM Axel Rasmussen <axelrasmussen@...gle.com> 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@...gle.com>
>>> ---
>>>   .../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