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[RFC,11/24] mm/hugetlb: Add vmemmap_pmd_huge macro for x86

Message ID 20200915125947.26204-12-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 
Use pmd_large instead of pmd_huge on x86, so we implement the
vmemmap_pmd_huge macro.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 arch/x86/include/asm/hugetlb.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
index f5e882f999cd..7c3eb60c2198 100644
--- a/arch/x86/include/asm/hugetlb.h
+++ b/arch/x86/include/asm/hugetlb.h
@@ -4,10 +4,17 @@ 
 
 #include <asm/page.h>
 #include <asm-generic/hugetlb.h>
+#include <asm/pgtable.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)
+
+#define vmemmap_pmd_huge vmemmap_pmd_huge
+static inline bool vmemmap_pmd_huge(pmd_t *pmd)
+{
+	return pmd_large(*pmd);
+}
 #endif
 
 #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE)