linux-kernel - [RFC PATCH 2/8] mm: Provide page size to pte_alloc

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Message-ID: <32f0c0802a202cc738f3f21682f53d76f01fc70e.1711377230.git.christophe.leroy@csgroup.eu>
Date: Mon, 25 Mar 2024 15:55:55 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Jason Gunthorpe <jgg@...dia.com>,
	Peter Xu <peterx@...hat.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH 2/8] mm: Provide page size to pte_alloc_huge()

In order to be able to flag the PMD entry with _PMD_HUGE_8M on
powerpc 8xx, provide page size to pte_alloc_huge() and use it
through the newly introduced pte_alloc_size().

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/arm64/mm/hugetlbpage.c   | 2 +-
 arch/parisc/mm/hugetlbpage.c  | 2 +-
 arch/powerpc/mm/hugetlbpage.c | 2 +-
 arch/riscv/mm/hugetlbpage.c   | 2 +-
 arch/sh/mm/hugetlbpage.c      | 2 +-
 arch/sparc/mm/hugetlbpage.c   | 2 +-
 include/linux/hugetlb.h       | 4 ++--
 7 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 0f0e10bb0a95..71161c655fd6 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -289,7 +289,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 			return NULL;
 
 		WARN_ON(addr & (sz - 1));
-		ptep = pte_alloc_huge(mm, pmdp, addr);
+		ptep = pte_alloc_huge(mm, pmdp, addr, sz);
 	} else if (sz == PMD_SIZE) {
 		if (want_pmd_share(vma, addr) && pud_none(READ_ONCE(*pudp)))
 			ptep = huge_pmd_share(mm, vma, addr, pudp);
diff --git a/arch/parisc/mm/hugetlbpage.c b/arch/parisc/mm/hugetlbpage.c
index a9f7e21f6656..2f4c6b440710 100644
--- a/arch/parisc/mm/hugetlbpage.c
+++ b/arch/parisc/mm/hugetlbpage.c
@@ -66,7 +66,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 	if (pud) {
 		pmd = pmd_alloc(mm, pud, addr);
 		if (pmd)
-			pte = pte_alloc_huge(mm, pmd, addr);
+			pte = pte_alloc_huge(mm, pmd, addr, sz);
 	}
 	return pte;
 }
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 594a4b7b2ca2..66ac56b26007 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -183,7 +183,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 		return NULL;
 
 	if (IS_ENABLED(CONFIG_PPC_8xx) && pshift < PMD_SHIFT)
-		return pte_alloc_huge(mm, (pmd_t *)hpdp, addr);
+		return pte_alloc_huge(mm, (pmd_t *)hpdp, addr, sz);
 
 	BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp));
 
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 5ef2a6891158..dc77a58c6321 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -67,7 +67,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
 
 	for_each_napot_order(order) {
 		if (napot_cont_size(order) == sz) {
-			pte = pte_alloc_huge(mm, pmd, addr & napot_cont_mask(order));
+			pte = pte_alloc_huge(mm, pmd, addr & napot_cont_mask(order), sz);
 			break;
 		}
 	}
diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 6cb0ad73dbb9..26579429e5ed 100644
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -38,7 +38,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 			if (pud) {
 				pmd = pmd_alloc(mm, pud, addr);
 				if (pmd)
-					pte = pte_alloc_huge(mm, pmd, addr);
+					pte = pte_alloc_huge(mm, pmd, addr, sz);
 			}
 		}
 	}
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index b432500c13a5..5a342199e837 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -298,7 +298,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 		return NULL;
 	if (sz >= PMD_SIZE)
 		return (pte_t *)pmd;
-	return pte_alloc_huge(mm, pmd, addr);
+	return pte_alloc_huge(mm, pmd, addr, sz);
 }
 
 pte_t *huge_pte_offset(struct mm_struct *mm,
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 77b30a8c6076..d9c5d9daadc5 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -193,9 +193,9 @@ static inline pte_t *pte_offset_huge(pmd_t *pmd, unsigned long address)
 	return pte_offset_kernel(pmd, address);
 }
 static inline pte_t *pte_alloc_huge(struct mm_struct *mm, pmd_t *pmd,
-				    unsigned long address)
+				    unsigned long address, unsigned long sz)
 {
-	return pte_alloc(mm, pmd) ? NULL : pte_offset_huge(pmd, address);
+	return pte_alloc_size(mm, pmd, sz) ? NULL : pte_offset_huge(pmd, address);
 }
 #endif
 
-- 
2.43.0