On x86_64 architecture, we use hupe page mapping vmemmap area. We should define VMEMMAP_HPAGE_SHIFT to the correct value to support freeing unused vmemmap pages.
Signed-off-by: Muchun Song <[email protected]> --- arch/x86/include/asm/hugetlb.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h index 1721b1aadeb1..f5e882f999cd 100644 --- a/arch/x86/include/asm/hugetlb.h +++ b/arch/x86/include/asm/hugetlb.h @@ -5,6 +5,11 @@ #include <asm/page.h> #include <asm-generic/hugetlb.h> +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP +#define VMEMMAP_HPAGE_SHIFT PMD_SHIFT +#define arch_vmemmap_support_huge_mapping() boot_cpu_has(X86_FEATURE_PSE) +#endif + #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE) #endif /* _ASM_X86_HUGETLB_H */ -- 2.20.1
