linux-kernel - [PATCH v2 2/3] RISC-V: mm: Enable huge page support to kernel_page

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Date:   Mon, 9 Jan 2023 14:24:06 +0800
From:   Sia Jee Heng <jeeheng.sia@...rfivetech.com>
To:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>
CC:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <jeeheng.sia@...rfivetech.com>, <leyfoon.tan@...rfivetech.com>,
        <mason.huo@...rfivetech.com>
Subject: [PATCH v2 2/3] RISC-V: mm: Enable huge page support to kernel_page_present() function

Currently kernel_page_present() function doesn't support huge page
detection causes the function to mistakenly return false to the
hibernation core.

Add huge page detection to the function to solve the problem.

Signed-off-by: Sia Jee Heng <jeeheng.sia@...rfivetech.com>
Reviewed-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
Reviewed-by: Mason Huo <mason.huo@...rfivetech.com>
---
 arch/riscv/mm/pageattr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
index 86c56616e5de..73fdec8c0a72 100644
--- a/arch/riscv/mm/pageattr.c
+++ b/arch/riscv/mm/pageattr.c
@@ -221,14 +221,20 @@ bool kernel_page_present(struct page *page)
 	p4d = p4d_offset(pgd, addr);
 	if (!p4d_present(*p4d))
 		return false;
+	if (p4d_leaf(*pud))
+		return true;
 
 	pud = pud_offset(p4d, addr);
 	if (!pud_present(*pud))
 		return false;
+	if (pud_leaf(*pud))
+		return true;
 
 	pmd = pmd_offset(pud, addr);
 	if (!pmd_present(*pmd))
 		return false;
+	if (pmd_leaf(*pmd))
+		return true;
 
 	pte = pte_offset_kernel(pmd, addr);
 	return pte_present(*pte);
-- 
2.34.1