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Re: [PATCH] x86/mm: Use standard C types for sized integers
- To: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 30 Oct 2024 12:02:19 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 30 Oct 2024 11:02:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.10.2024 11:44, Frediano Ziglio wrote:
> The header is already using these types.
>
> Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Nevertheless I wonder whether ...
> --- a/xen/arch/x86/include/asm/mm.h
> +++ b/xen/arch/x86/include/asm/mm.h
> @@ -230,7 +230,7 @@ struct page_info
> * Only valid for: a) free pages, and b) pages with zero type count
> * (except page table pages when the guest is in shadow mode).
> */
> - u32 tlbflush_timestamp;
> + uint32_t tlbflush_timestamp;
>
> /*
> * When PGT_partial is true then the first two fields are valid and
> @@ -284,8 +284,8 @@ struct page_info
> * in use.
> */
> struct {
> - u16 nr_validated_ptes:PAGETABLE_ORDER + 1;
> - u16 :16 - PAGETABLE_ORDER - 1 - 1;
> + uint16_t nr_validated_ptes:PAGETABLE_ORDER + 1;
> + uint16_t :16 - PAGETABLE_ORDER - 1 - 1;
> uint16_t partial_flags:1;
... fixed width types are really needed here; afaict unsigned int ought to do.
> int16_t linear_pt_count;
It's only here where the fixed width type is largely needed (or alternatively
signed int linear_pt_count:16;
).
Jan
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