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Re: [PATCH] x86/ACPI: annotate assembly data with type and size
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Oct 2024 11:14:18 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 02 Oct 2024 09:14:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.10.2024 11:07, Andrew Cooper wrote:
> On 02/10/2024 8:41 am, Jan Beulich wrote:
>> Further use the generic framework from xen/linkage.h. While there drop
>> excess alignment and move to .bss.
>>
>> Requested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> Of course alongside ASM_INT() we could introduce ASM_QUAD() and
>> ASM_QUAD_LOCAL() (only the latter needed right here) to aid readability.
>> Thoughts?
>
> Honestly, ASM_INT() hiding a .long is confusing enough already.
>
> ASM_C_{INT,LONG}() wouldn't be as bad. At least they're clear about
> being a particular type in another language.
I don't think the _C_ would add much; we all know C is the language Xen
is written in. ASM_LONG() / ASM_C_LONG() would not be generalizable, i.e.
couldn't be put in xen/linkage.h without arch customization, as that can
neither expand uniformly to .long nor to .quad. It's all solvable, but
would be getting involved.
>> --- a/xen/arch/x86/acpi/wakeup_prot.S
>> +++ b/xen/arch/x86/acpi/wakeup_prot.S
>> @@ -1,3 +1,5 @@
>> +#define DATA_FILL 0 /* For the .bss contributions at the bottom. */
>> +
>
> I really feel that here is the wrong place for this to live.
>
> Why isn't it in xen/linkage.h? When is data typically padded with
> anything other than 0's?
As per what we currently have, the default data padding is ~0. Personally
I consider this marginally better than 0, but it could of course be
changed.
Jan
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