linux-kernel - [RFC 10/20] mm: add pte_to

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Date:   Sat, 30 Jan 2021 16:11:22 -0800
From:   Nadav Amit <nadav.amit@...il.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Nadav Amit <namit@...are.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Nick Piggin <npiggin@...il.com>,
        Yu Zhao <yuzhao@...gle.com>
Subject: [RFC 10/20] mm: add pte_to_page()

From: Nadav Amit <namit@...are.com>

Add a pte_to_page(), which is similar to pmd_to_page, which will be used
later.

Inline pmd_to_page() as well.

Signed-off-by: Nadav Amit <namit@...are.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will@...nel.org>
Cc: Nick Piggin <npiggin@...il.com>
Cc: Yu Zhao <yuzhao@...gle.com>
---
 include/linux/mm.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ecdf8a8cd6ae..d78a79fbb012 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2161,6 +2161,13 @@ static inline spinlock_t *ptlock_ptr(struct page *page)
 }
 #endif /* ALLOC_SPLIT_PTLOCKS */
 
+static inline struct page *pte_to_page(pte_t *pte)
+{
+	unsigned long mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
+
+	return virt_to_page((void *)((unsigned long) pte & mask));
+}
+
 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
 {
 	return ptlock_ptr(pmd_page(*pmd));
@@ -2246,7 +2253,7 @@ static inline void pgtable_pte_page_dtor(struct page *page)
 
 #if USE_SPLIT_PMD_PTLOCKS
 
-static struct page *pmd_to_page(pmd_t *pmd)
+static inline struct page *pmd_to_page(pmd_t *pmd)
 {
 	unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
 	return virt_to_page((void *)((unsigned long) pmd & mask));
-- 
2.25.1