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[RFC,22/24] mm/hugetlb: Implement vmemmap_pmd_mkhuge macro

Message ID 20200915125947.26204-23-songmuchun@bytedance.com (mailing list archive)
State New, archived
Headers show
Series mm/hugetlb: Free some vmemmap pages of hugetlb page | expand

Commit Message

Muchun Song Sept. 15, 2020, 12:59 p.m. UTC 
In vmemmap_populate_hugepages(), we use PAGE_KERNEL_LARGE for
huge page mapping. So we can inplement vmemmap_pmd_mkhuge macro
to do that.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 arch/x86/include/asm/hugetlb.h | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
index 7c3eb60c2198..9f9e19dd0578 100644
--- a/arch/x86/include/asm/hugetlb.h
+++ b/arch/x86/include/asm/hugetlb.h
@@ -15,6 +15,14 @@  static inline bool vmemmap_pmd_huge(pmd_t *pmd)
 {
 	return pmd_large(*pmd);
 }
+
+#define vmemmap_pmd_mkhuge vmemmap_pmd_mkhuge
+static inline pmd_t vmemmap_pmd_mkhuge(struct page *page)
+{
+	pte_t entry = pfn_pte(page_to_pfn(page), PAGE_KERNEL_LARGE);
+
+	return __pmd(pte_val(entry));
+}
 #endif
 
 #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE)