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From: Michael Tokarev <mjt@tls.msk.ru>
To: Peter Maydell <peter.maydell@linaro.org>, Wei Huang <wei@redhat.com>
Cc: QEMU Trivial <qemu-trivial@nongnu.org>,
	Igor Mammedov <imammedo@redhat.com>,
	Shannon Zhao <shannon.zhao@linaro.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Shannon Zhao <zhaoshenglong@huawei.com>
Subject: Re: [Qemu-trivial] [PATCH 2/2] ARM: PL061: Misc cleaning fields for PL061 device state
Date: Tue, 2 Feb 2016 10:03:04 +0300	[thread overview]
Message-ID: <56B054A8.6020602@msgid.tls.msk.ru> (raw)
In-Reply-To: <CAFEAcA9XZHowe_JtGFcqEJpnZiqXwT+36bBPPKXWSgc1aVGtHg@mail.gmail.com>

01.02.2016 21:01, Peter Maydell wrote:
> On 1 February 2016 at 17:20, Wei Huang <wei@redhat.com> wrote:
>> This patch removes float_high field of PL061State, which doesn't seem
>> to be used anywhere.
[]
>> @@ -88,7 +87,6 @@ static const VMStateDescription vmstate_pl061 = {
>>          VMSTATE_UINT32(slr, PL061State),
>>          VMSTATE_UINT32(den, PL061State),
>>          VMSTATE_UINT32(cr, PL061State),
>> -        VMSTATE_UINT32(float_high, PL061State),
>>          VMSTATE_UINT32_V(amsel, PL061State, 2),
>>          VMSTATE_END_OF_LIST()
> 
> This would be a migration compatibility break, so at a minimum
> you need to bump the vmstate struct versions.

Is it worth the effort to remove this field if it causes
compatibility break?  Maybe keep it around, it doesn't hurt?
At the very least, we may rename it to "unused_float_high",
or something, to indicate it is a known-unused?

Thanks,

/mjt


  reply	other threads:[~2016-02-02  7:03 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-01 17:20 [Qemu-trivial] [PATCH 1/2] ARM: PL061: Clear PL061 device state after reset Wei Huang
2016-02-01 17:20 ` [Qemu-trivial] [PATCH 2/2] ARM: PL061: Misc cleaning fields for PL061 device state Wei Huang
2016-02-01 18:01   ` Peter Maydell
2016-02-02  7:03     ` Michael Tokarev [this message]
2016-02-02 15:16       ` Wei Huang

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