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Re: [Xen-devel] [PATCH v2] xen:arm: Populate arm64 image header
- To: Amit Tomer <amittomer25@xxxxxxxxx>
- From: Andre Przywara <andre.przywara@xxxxxxx>
- Date: Wed, 5 Sep 2018 14:04:20 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 05 Sep 2018 13:03:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
Hi,
On 05/09/18 13:52, Amit Tomer wrote:
> Hello,
>
> Thanks for having a look.
>
> On Wed, Sep 5, 2018 at 6:07 PM Andre Przywara <andre.przywara@xxxxxxx> wrote:
>>
>> Hi,
>>
>> I don't think it's helpful to hide that KERNEL_SIZE definition in
>> another file. Please just put "_end - start" here.
>
> Yeah, I thought about it and felt that it would be cleaner and more
> readable if we use macros here.
I don't see how this improves readability.
The point is that this line as is:
.quad __KERNEL_SIZE /* Effective size of kernel image, little-endian */
conveys only little information, basically you say that "kernel size is
kernel size". I would rather see the actual definition of kernel size
here, since the comment explains the meaning already.
> Also, wanted to have minimal changes in head.S and that is the reason
> for using assemble.h.
assembler.h wouldn't be the right place anyway. AFAICT it's only there
to make those files in lib/ happy, which are mostly copied from Linux.
Cheers,
Andre.
>> Either you call this __HEAD_FLAG_PAGE_SIZE_4K, or, even better, copy the
>> Linux definition, which would make it obvious where this comes from and
>> would alert any developer of the PAGE_SIZE dependency.
>>
>> Plus move those into head.S, as mentioned above.
>
> Ok.
>>> +
>>> +#define __KERNEL_SIZE (_end - start)
>>> +
>>> #endif /* __ASM_ASSEMBLER_H__ */
>>>
>
> Thanks
> -Amit
>
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