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@xxxxxxxxxxxxxxx>
---
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
