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Re: [PATCH] earlycpio: constify find_cpio_data()'s "data" parameter
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Oct 2024 17:25:12 +0100
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 28 Oct 2024 16:25:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.10.2024 17:18, Andrew Cooper wrote:
> On 28/10/2024 4:12 pm, Jan Beulich wrote:
>> On 28.10.2024 17:07, Andrew Cooper wrote:
>>> On 28/10/2024 4:03 pm, Jan Beulich wrote:
>>>> As with 9cbf61445cda ("xen/earlycpio: Drop nextoff parameter"): While
>>>> this is imported from Linux, the parameter not being pointer-to-const is
>>>> dubious in the first place and we're not plausibly going to gain a write
>>>> through it.
>>>>
>>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>> You haven't tried compiling this, have you?
>> Of course I have. Is there any subtlety with compiler versions? Or what
>> else am I missing?
>
> struct cpio_data's copy of this field is non-const (which you keep on
> noting that new compilers will object to),
New compilers? I'm afraid I'm missing context. With gcc14 the patch builds
fine. I didn't try _older_ ones (but I see no reason why they might object;
see below).
> and you can't change that
> without breaking the build in microcode.
I don't need to change that, "thanks" to
cd.data = (void *)dptr;
casting away const-ness. That is - compilers ought to be fine with the
change; Misra won't like it.
> Nothing of this form can be taken until the constness is consistent in
> microcode, after which yes it can mostly become const.
We can move there in steps, can't we?
Jan
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