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Re: [PATCH v3 1/9] libs/guest: Reduce number of parts in write_split_record
- To: Frediano Ziglio <freddy77@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 Jun 2026 12:50:14 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Tue, 02 Jun 2026 11:50:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26/05/2026 10:43 am, Frediano Ziglio wrote:
> From: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
>
> Small optimization.
> There's no much sense to split the header in 2 pieces, it will
> just take more time and space to reassemble them in the final
> buffer.
This part is fine.
> This also avoids truncating combined_length to 32 bit in case of
> 64 bit machines potentially avoiding following record_length check.
> The function become more coherent with following read_record
> function.
This isn't. The truncation just happens in a different place now, when
constructing rhdr. The length is strictly 32 bits.
I'd just drop this paragraph. The largest record is marginally over 4M,
and callers won't be passing in anything larger.
~Andrew
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