Re: [PATCH v1 1/1] KVM: s390: Don't cast parameter in bit operations

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Michael Mueller <mimu@linux.ibm.com>, Yury Norov <yury.norov@gmail.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Janosch Frank <frankja@linux.ibm.com>,
	David Hildenbrand <david@redhat.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>
Subject: Re: [PATCH v1 1/1] KVM: s390: Don't cast parameter in bit operations
Date: Wed, 2 Mar 2022 17:44:03 +0200	[thread overview]
Message-ID: <Yh+Qw6Pb+Cd9JDNa@smile.fi.intel.com> (raw)
In-Reply-To: <3640a910-60fe-0935-4dfc-55bb65a75ce5@linux.ibm.com>

On Thu, Feb 24, 2022 at 01:10:34PM +0100, Michael Mueller wrote:
> On 24.02.22 12:36, Claudio Imbrenda wrote:

...

> we do that at several places

Thanks for pointing out.

> arch/s390/kernel/processor.c:	for_each_set_bit_inv(bit, (long
> *)&stfle_fac_list, MAX_FACILITY_BIT)

This one requires a separate change, not related to this patch.

> arch/s390/kvm/interrupt.c:	set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long
> *) gisa);

This is done in the patch. Not sure how it appears in your list.

> arch/s390/kvm/kvm-s390.c:		set_bit_inv(vcpu->vcpu_id, (unsigned long *)
> sca->mcn);
> arch/s390/kvm/kvm-s390.c:		set_bit_inv(vcpu->vcpu_id, (unsigned long *)
> &sca->mcn);

These two should be fixed in a separate change.

Also this kind of stuff:

	bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
	            KVM_S390_VM_CPU_FEAT_NR_BITS);

might require a new API like

bitmap_from_u64_array()
bitmap_to_u64_array()

Yury?

-- 
With Best Regards,
Andy Shevchenko