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Re: [PATCH 2/2] xen/build-id: Drop xen_build_id_check()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 4 Nov 2026 16:26:36 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 04 Nov 2026 16:26:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04/11/2026 2:51 pm, Jan Beulich wrote:
> On 04.11.2026 14:51, Andrew Cooper wrote:
>> The function is misnamed; it really is looking for a GNU Build ID note, not a
>> Xen note as the name suggests.
>>
>> It also has an awkward API to use. For a GNU Build ID, the content is always
>> at +16 from the start, so really doesn't need to be returned by pointer, nor
>> is it necessary be doing additional checks on the returned pointers being
>> valid.
>>
>> Switching to is_gnu_build_id() allows xen_build_init() to be simplified,
>> returning after the first successful find rather than passing an rc down the
>> function to skip later checks.
>>
>> No functional change.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Thanks (subject to the API needing to change in patch 1)
>
>> The 16 probably ought to be a define somewhere, but I see no obvious
>> candidates in the ELF spec.
> That's for NT_GNU_HDR_SIZE in patch 1? Why should the ELF spec care about
> GNU notes?
Oops. I wrote that note when I was still using raw +/- 16's, and
forgot to remove it when I introduced NT_GNU_HDR_SIZE.
I meant elf.h, but decided to just reuse the NT_ prefix because
everything appears to be ad-hoc.
~Andrew
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