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Re: [PATCH v7 10/11] Arm32: use new-style entry annotations in head.S
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 26 Nov 2024 10:02:01 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 26 Nov 2024 09:02:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.11.2024 21:28, Julien Grall wrote:
> On 01/10/2024 16:17, Jan Beulich wrote:
>> Locally override SYM_PUSH_SECTION() to retain the intended section
>> association.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> v7: New.
>>
>> --- a/xen/arch/arm/arm32/head.S
>> +++ b/xen/arch/arm/arm32/head.S
>> @@ -48,13 +48,20 @@
>>
>> .section .text.header, "ax", %progbits
>> .arm
>> +/*
>> + * Code below wants to all live in the section established above.
>> Annotations
>> + * from xen/linkage.h therefore may not switch sections (honoring
>> + * CONFIG_CC_SPLIT_SECTIONS). Override the respective macro.
>> + */
>> +#undef SYM_PUSH_SECTION
>> +#define SYM_PUSH_SECTION(name, attr)
>
> Are you suggesting the code in arch/*/head.S has a latent bug?
I don't think I'd call this a "bug". Code which is sensitive to what precise
section it lives in better is left unaffected by the per-function sections
that CC_SPLIT_SECTIONS=y asks for. Which precise way this is arranged for is
a separate question. You'll find a few more instances of this approach
throughout the series.
Jan
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