linux-kernel - [RFC PATCH v2 1/4] riscv: Add support pte_protnone and pmd_protnone if CONFIG_NUMA

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Message-Id: <1ff7e57f16cb43c8816b90716a872b8f0f101c42.1577694824.git.greentime.hu@sifive.com>
Date:   Fri, 10 Jan 2020 18:46:24 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     greentime.hu@...ive.com, greentime@...nel.org, anup@...infault.org,
        palmer@...belt.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, rppt@...ux.ibm.com,
        gkulkarni@...vell.com, will@...nel.org, catalin.marinas@....com,
        mark.rutland@....com, paul.walmsley@...ive.com, hch@....de
Subject: [RFC PATCH v2 1/4] riscv: Add support pte_protnone and pmd_protnone if CONFIG_NUMA_BALANCING

These two functions are used to distinguish between PROT_NONENUMA
protections and hinting fault protections.

Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
---
 arch/riscv/include/asm/pgtable.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 36ae01761352..9650a4ce073e 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -166,6 +166,11 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 	return (unsigned long)pfn_to_virt(pmd_val(pmd) >> _PAGE_PFN_SHIFT);
 }
 
+static inline pte_t pmd_pte(pmd_t pmd)
+{
+	return __pte(pmd_val(pmd));
+}
+
 /* Yields the page frame number (PFN) of a page table entry */
 static inline unsigned long pte_pfn(pte_t pte)
 {
@@ -279,6 +284,21 @@ static inline pte_t pte_mkhuge(pte_t pte)
 	return pte;
 }
 
+#ifdef CONFIG_NUMA_BALANCING
+/*
+ * See the comment in include/asm-generic/pgtable.h
+ */
+static inline int pte_protnone(pte_t pte)
+{
+	return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE)) == _PAGE_PROT_NONE;
+}
+
+static inline int pmd_protnone(pmd_t pmd)
+{
+	return pte_protnone(pmd_pte(pmd));
+}
+#endif
+
 /* Modify page protection bits */
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-- 
2.17.1