linux-kernel - [PATCH v2 07/19] ARC: mm: pmd_populate* to use the canonical set_pmd (and drop pmd

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Message-Id: <20210812233753.104217-8-vgupta@kernel.org>
Date:   Thu, 12 Aug 2021 16:37:41 -0700
From:   Vineet Gupta <vgupta@...nel.org>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mike Rapoport <rppt@...nel.org>,
        Vineet Gupta <vgupta@...nel.org>
Subject: [PATCH v2 07/19] ARC: mm: pmd_populate* to use the canonical set_pmd (and drop pmd_set)

Signed-off-by: Vineet Gupta <vgupta@...nel.org>
---
 arch/arc/include/asm/pgalloc.h | 14 ++++++++++----
 arch/arc/include/asm/pgtable.h |  6 ------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/arc/include/asm/pgalloc.h b/arch/arc/include/asm/pgalloc.h
index a32ca3104ced..408bc4b0842d 100644
--- a/arch/arc/include/asm/pgalloc.h
+++ b/arch/arc/include/asm/pgalloc.h
@@ -35,13 +35,19 @@
 static inline void
 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 {
-	pmd_set(pmd, pte);
+	/*
+	 * The cast to long below is OK in 32-bit PAE40 regime with long long pte
+	 * Despite "wider" pte, the pte table needs to be in non-PAE low memory
+	 * as all higher levels can only hold long pointers.
+	 *
+	 * The cast itself is needed given simplistic definition of set_pmd()
+	 */
+	set_pmd(pmd, __pmd((unsigned long)pte));
 }
 
-static inline void
-pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep)
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte)
 {
-	pmd_set(pmd, (pte_t *) ptep);
+	set_pmd(pmd, __pmd((unsigned long)pte));
 }
 
 static inline int __get_order_pgd(void)
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index b054c14f8bf6..f762bacb2358 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -222,12 +222,6 @@ extern char empty_zero_page[PAGE_SIZE];
 /* find the logical addr (phy for ARC) of the Page Tbl ref by PMD entry */
 #define pmd_page_vaddr(pmd)	(pmd_val(pmd) & PAGE_MASK)
 
-/* In a 2 level sys, setup the PGD entry with PTE value */
-static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
-{
-	pmd_val(*pmdp) = (unsigned long)ptep;
-}
-
 #define pte_none(x)			(!pte_val(x))
 #define pte_present(x)			(pte_val(x) & _PAGE_PRESENT)
 #define pte_clear(mm, addr, ptep)	set_pte_at(mm, addr, ptep, __pte(0))
-- 
2.25.1