[tip: x86/cleanups] x86/mm: Drop pud_mknotpresent()

[tip-bot2 for Anshuman Khandual]

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     31a9122058bc5f042cb04bcdb8cd9e6c77fdae8d
Gitweb:        https://git.kernel.org/tip/31a9122058bc5f042cb04bcdb8cd9e6c77fdae8d
Author:        Anshuman Khandual <anshuman.khandual@xxxxxxx>
AuthorDate:    Mon, 23 Mar 2020 06:35:42 +05:30
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Mon, 23 Mar 2020 09:11:48 +01:00

x86/mm: Drop pud_mknotpresent()

There is an inconsistency between PMD and PUD-based THP page table helpers
like the following, as pud_present() does not test for _PAGE_PSE.

pmd_present(pmd_mknotpresent(pmd)) : True
pud_present(pud_mknotpresent(pud)) : False

Drop pud_mknotpresent() as there are no current users. If/when needed
back later, pud_present() will also have to be fixed to accommodate
_PAGE_PSE.

Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
Acked-by: Balbir Singh <bsingharora@xxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/1584925542-13034-1-git-send-email-anshuman.khandual@xxxxxxx
---
 arch/x86/include/asm/pgtable.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 7e11866..d74dc56 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -595,12 +595,6 @@ static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 		      __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
 }
 
-static inline pud_t pud_mknotpresent(pud_t pud)
-{
-	return pfn_pud(pud_pfn(pud),
-	      __pgprot(pud_flags(pud) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
-}
-
 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)