Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCHv2 5/7] x86/mm: Reserve unaccepted memory bitmap | Date | Tue, 11 Jan 2022 14:33:12 +0300 |
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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.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/kernel/e820.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index bc0657f0deed..dc9048e2d421 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -1290,6 +1290,16 @@ void __init e820__memory_setup(void) pr_info("BIOS-provided physical RAM map:\n"); e820__print_table(who); + + /* 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); + } } void __init e820__memblock_setup(void) -- 2.34.1
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