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Re: [Xen-devel] [PATCH 2/3] xen: drop preempt_count() for non-debug builds
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 22 May 2019 11:39:51 +0100
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 22 May 2019 10:40:15 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 22/05/2019 11:18, Jan Beulich wrote:
>>>> On 22.05.19 at 12:00, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 22/05/2019 10:45, Juergen Gross wrote:
>>> preempt_count() and the associated per-cpu variable __preempt_count
>>> are tested in debug build only. So drop them for non-debug builds.
>>>
>>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>> I'd be tempted to fold patches 2 and 3 together, because they are both
>> the same change, and it would reduce the churn.
>>
>> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, ideally with the
>> two folded into one.
> I'm a little surprised by this: Wasn't it you who generally
> wanted what ASSERT() expands to (controlled by NDEBUG)
> be independent of CONFIG_DEBUG, at some point down
> the road?
In some ideal world yes, but what is rather more important is actually
having optimisation control unrelated to NDEBUG.
> Aren't you even having ASSERT()s enabled in
> release builds of XenServer, or am I misremembering? If so
> patch 3 would move us in the wrong direction.
We build and ship a debug and a release hypervisor.
~Andrew
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