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Re: [PATCH] xen/pdx: fix merging of a range contained in the previous one
- To: Weiqi Wang <coolhaoyt@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 5 Oct 2026 11:52:54 +0200
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- Cc: roger@xxxxxxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, michal.orzel@xxxxxxx, julien@xxxxxxx, sstabellini@xxxxxxxxxx, lucas.cordeiro@xxxxxxxxxxxxxxxx, Weiqi Wang <weiqi.wang-2@xxxxxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 05 Oct 2026 09:53:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.10.2026 21:03, Weiqi Wang wrote:
> From: Weiqi Wang <weiqi.wang-2@xxxxxxxxxxxxxxxxxxxxxxxxx>
>
> When sorting and merging overlapping ranges in
> pfn_pdx_compression_setup(),
As we have two distinct instances of this function, at least one of title
or description want to clarify that it's the offset-compression one.
> --- a/tools/tests/pdx/test-pdx.c
> +++ b/tools/tests/pdx/test-pdx.c
> @@ -87,6 +87,18 @@ int main(int argc, char **argv)
> },
> .compress = true,
> },
> + /* Range contained in a previous one. */
> + {
> + .ranges = {
> + { .start = 0,
> + .end = (1UL << MAX_ORDER) * 1
> },
> + { .start = (1UL << (MAX_ORDER * 2)) | 0,
> + .end = (1UL << (MAX_ORDER * 2)) | (1UL << MAX_ORDER) * 4
> },
> + { .start = (1UL << (MAX_ORDER * 2)) | (1UL << MAX_ORDER) * 1,
> + .end = (1UL << (MAX_ORDER * 2)) | (1UL << MAX_ORDER) * 2
> },
Nit: The multiplications also want parenthesizing against the binary ORs.
Jan
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