Re: [PATCHv2 5/7] x86/mm: Reserve unaccepted memory bitmap

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On 1/11/22 03:33, Kirill A. Shutemov wrote:
Unaccepted memory bitmap is allocated during decompression stage and
handed over to main kernel image via boot_params. The bitmap is used to
track if memory has been accepted.

Reserve unaccepted memory bitmap has to prevent reallocating memory for
other means.

I'm having a hard time parsing that changelog, especially the second paragraph. Could you give it another shot?

+	/* Mark unaccepted memory bitmap reserved */
+	if (boot_params.unaccepted_memory) {
+		unsigned long size;
+
+		/* One bit per 2MB */
+		size = DIV_ROUND_UP(e820__end_of_ram_pfn() * PAGE_SIZE,
+				    PMD_SIZE * BITS_PER_BYTE);
+		memblock_reserve(boot_params.unaccepted_memory, size);
+	}

Is it OK that the size of the bitmap is inferred from e820__end_of_ram_pfn()? Is this OK in the presence of mem= and other things that muck with the e820?



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