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Re: [PATCH v1 1/3] xen/console: cleanup conring management
- To: dmkhn@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Apr 2025 08:47:01 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, dmukhin@xxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Mon, 28 Apr 2025 06:47:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.04.2025 00:18, Stefano Stabellini wrote:
> On Thu, 3 Apr 2025, dmkhn@xxxxxxxxx wrote:
>> From: Denis Mukhin <dmukhin@xxxxxxxx>
>>
>> Move console_locks_busted handling inside conring_puts() to remove
>> tasklet code duplication.
>>
>> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
>
> This patch is a good cleanup but makes one functional change: previously
> guest_console_write would always call tasklet_schedule. Now, it only
> calls tasklet_schedule if !console_locks_busted.
>
> On ARM, we don't call console_force_unlock and never set
> console_locks_busted. It makes no difference.
>
> On x86, there are a few callers of console_force_unlock, so it would
> make a difference. However, looking at the callers, it seems to me that
> the change is for the better and better aligns the code with the
> intention behind console_force_unlock.
Denis, I see you submitted v2 without any adjustment to the description.
With Stefano having pointed out the aspect, it should have been pretty
clear that such a (kind of hidden) functional change wants justifying.
Furthermore, you added Stefano's R-b without any hint towards the extra
request he had put up above wrt x86.
Jan
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