linux-kernel - [RFC PATCH v2 02/47] hugetlb: remove mk_huge

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Date:   Fri, 21 Oct 2022 16:36:18 +0000
From:   James Houghton <jthoughton@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        "Zach O'Keefe" <zokeefe@...gle.com>,
        Manish Mishra <manish.mishra@...anix.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH v2 02/47] hugetlb: remove mk_huge_pte; it is unused

mk_huge_pte is unused and not necessary. pte_mkhuge is the appropriate
function to call to create a HugeTLB PTE (see
Documentation/mm/arch_pgtable_helpers.rst).

It is being removed now to avoid complicating the implementation of
HugeTLB high-granularity mapping.

Signed-off-by: James Houghton <jthoughton@...gle.com>
---
 arch/s390/include/asm/hugetlb.h | 5 -----
 include/asm-generic/hugetlb.h   | 5 -----
 mm/debug_vm_pgtable.c           | 2 +-
 mm/hugetlb.c                    | 7 +++----
 4 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index ccdbccfde148..c34893719715 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -77,11 +77,6 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
 }
 
-static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
-{
-	return mk_pte(page, pgprot);
-}
-
 static inline int huge_pte_none(pte_t pte)
 {
 	return pte_none(pte);
diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index a57d667addd2..aab9e46fa628 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -5,11 +5,6 @@
 #include <linux/swap.h>
 #include <linux/swapops.h>
 
-static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
-{
-	return mk_pte(page, pgprot);
-}
-
 static inline unsigned long huge_pte_write(pte_t pte)
 {
 	return pte_write(pte);
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 2b61fde8c38c..10573a283a12 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -929,7 +929,7 @@ static void __init hugetlb_basic_tests(struct pgtable_debug_args *args)
 	 * as it was previously derived from a real kernel symbol.
 	 */
 	page = pfn_to_page(args->fixed_pmd_pfn);
-	pte = mk_huge_pte(page, args->page_prot);
+	pte = mk_pte(page, args->page_prot);
 
 	WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
 	WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 650761cdd2f6..20a111b532aa 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4728,11 +4728,10 @@ static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page,
 	unsigned int shift = huge_page_shift(hstate_vma(vma));
 
 	if (writable) {
-		entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page,
-					 vma->vm_page_prot)));
+		entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_pte(page,
+						vma->vm_page_prot)));
 	} else {
-		entry = huge_pte_wrprotect(mk_huge_pte(page,
-					   vma->vm_page_prot));
+		entry = huge_pte_wrprotect(mk_pte(page, vma->vm_page_prot));
 	}
 	entry = pte_mkyoung(entry);
 	entry = arch_make_huge_pte(entry, shift, vma->vm_flags);
-- 
2.38.0.135.g90850a2211-goog