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Re: [XEN PATCH 3/7] xen/x86: add missing instances of asmlinkage attributes
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 30 Nov 2023 17:44:20 +0100
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, bertrand.marquis@xxxxxxx, julien@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 30 Nov 2023 16:44:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.11.2023 16:24, Nicola Vetrini wrote:
> --- a/xen/arch/x86/desc.c
> +++ b/xen/arch/x86/desc.c
> @@ -91,7 +91,7 @@ seg_desc_t boot_compat_gdt[PAGE_SIZE / sizeof(seg_desc_t)] =
> * References boot_cpu_gdt_table for a short period, until the CPUs switch
> * onto their per-CPU GDTs.
> */
> -const struct desc_ptr boot_gdtr = {
> +const struct desc_ptr asmlinkage boot_gdtr = {
> .limit = LAST_RESERVED_GDT_BYTE,
> .base = (unsigned long)(boot_gdt - FIRST_RESERVED_GDT_ENTRY),
> };
I'm not convinced asmlinkage is okay to use on data. Recall that in principle
it may expand to an attribute specifying a non-default calling convention.
Such attributes cannot be assumed to continue to be possible to apply to
non-functions, even if such may happen to work with a particular compiler
version.
Jan
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