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Re: [qemu-s390x] [PATCH v3 2/9] s390x/kvm: pass values instead of pointe
From: |
Cornelia Huck |
Subject: |
Re: [qemu-s390x] [PATCH v3 2/9] s390x/kvm: pass values instead of pointers to kvm_s390_set_clock_*() |
Date: |
Mon, 25 Jun 2018 18:03:41 +0200 |
On Mon, 25 Jun 2018 17:54:42 +0200
David Hildenbrand <address@hidden> wrote:
> On 25.06.2018 17:50, Cornelia Huck wrote:
> > On Mon, 25 Jun 2018 13:53:45 +0200
> > David Hildenbrand <address@hidden> wrote:
> >
> >> We are going to factor out the TOD into a separate device and use const
> >> pointers for device class functions where possible. We are passing right
> >> now ordinary pointers that should never be touched when setting the TOD.
> >> Let's just pass the values directly.
> >>
> >> Signed-off-by: David Hildenbrand <address@hidden>
> >> ---
> >> target/s390x/cpu.c | 4 ++--
> >> target/s390x/kvm-stub.c | 4 ++--
> >> target/s390x/kvm.c | 12 ++++++------
> >> target/s390x/kvm_s390x.h | 4 ++--
> >> 4 files changed, 12 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> >> index c268065887..68512e3e54 100644
> >> --- a/target/s390x/cpu.c
> >> +++ b/target/s390x/cpu.c
> >> @@ -413,9 +413,9 @@ int s390_set_clock(uint8_t *tod_high, uint64_t
> >> *tod_low)
> >
> > Any reason why you keep the pointers here?
> >
> >> int r = 0;
> >>
> >> if (kvm_enabled()) {
> >> - r = kvm_s390_set_clock_ext(tod_high, tod_low);
> >> + r = kvm_s390_set_clock_ext(*tod_high, *tod_low);
> >> if (r == -ENXIO) {
> >> - return kvm_s390_set_clock(tod_high, tod_low);
> >> + return kvm_s390_set_clock(*tod_high, *tod_low);
> >
> > Especially as it would be more clean to check for !NULL before
> > dereferencing...
>
> See the next patch :)
>
> (I assume that refactoring code in order to rip it out does not make sense)
Add a comment in the commit message?
"Note that s390_set_clock() will be removed in a follow-on patch and
therefore its calling convention is not changed."
[qemu-s390x] [PATCH v3 4/9] s390x/tcg: drop tod_basetime, David Hildenbrand, 2018/06/25
[qemu-s390x] [PATCH v3 3/9] s390x/tod: factor out TOD into separate device, David Hildenbrand, 2018/06/25
[qemu-s390x] [PATCH v3 7/9] s390x/tcg: implement SET CLOCK, David Hildenbrand, 2018/06/25
[qemu-s390x] [PATCH v3 8/9] s390x/tcg: rearm the CKC timer during migration, David Hildenbrand, 2018/06/25
[qemu-s390x] [PATCH v3 6/9] s390x/tcg: SET CLOCK COMPARATOR can clear CKC interrupts, David Hildenbrand, 2018/06/25