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Re: [PATCH v2 4/7] xen: move max_pfn in xen_memory_setup() out of function scope
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 20 Aug 2024 10:44:55 +0200
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- Delivery-date: Tue, 20 Aug 2024 08:45:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.08.2024 10:20, Juergen Gross wrote:
> Instead of having max_pfn as a local variable of xen_memory_setup(),
> make it a static variable in setup.c instead. This avoids having to
> pass it to subfunctions, which will be needed in more cases in future.
>
> Rename it to ini_nr_pages, as the value denotes the currently usable
> number of memory pages as passed from the hypervisor at boot time.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Tested-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I wonder though why ...
> @@ -712,9 +713,9 @@ char * __init xen_memory_setup(void)
> int op;
>
> xen_parse_512gb();
> - max_pfn = xen_get_pages_limit();
> - max_pfn = min(max_pfn, xen_start_info->nr_pages);
> - mem_end = PFN_PHYS(max_pfn);
> + ini_nr_pages = xen_get_pages_limit();
> + ini_nr_pages = min(ini_nr_pages, xen_start_info->nr_pages);
... this can't be just
ini_nr_pages = min(xen_get_pages_limit(), xen_start_info->nr_pages);
Jan
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