linux-kernel - [PATCH v3] LoongArch: add p?d

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Message-Id: <20230906092019.4681-1-zhanghongchen@loongson.cn>
Date:   Wed,  6 Sep 2023 17:20:19 +0800
From:   Hongchen Zhang <zhanghongchen@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        "Mike Rapoport IBM)" <rppt@...nel.org>,
        Feiyang Chen <chenfeiyang@...ngson.cn>,
        Hongchen Zhang <zhanghongchen@...ngson.cn>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        "Matthew Wilcox Oracle)" <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v3] LoongArch: add p?d_leaf() definitions

When I do LTP test, LTP test case ksm06 caused panic at
	break_ksm_pmd_entry
	  -> pmd_leaf (Huge page table but False)
	  -> pte_present (panic)

The reason is pmd_leaf is not defined, So like
commit 501b81046701 ("mips: mm: add p?d_leaf() definitions")
add p?d_leaf() definition for LoongArch.

Fixes: 09cfefb7fa70 ("LoongArch: Add memory management")
Cc: stable@...r.kernel.org
Signed-off-by: Hongchen Zhang <zhanghongchen@...ngson.cn>
---
v2->v3: add Cc: stable@...r.kernel.org
v1->v2: add Fixes in commit message
---
 arch/loongarch/include/asm/pgtable.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index 370c6568ceb8..ea54653b7aab 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -243,6 +243,9 @@ static inline void pmd_clear(pmd_t *pmdp)
 
 #define pmd_phys(pmd)		PHYSADDR(pmd_val(pmd))
 
+#define pmd_leaf(pmd)		((pmd_val(pmd) & _PAGE_HUGE) != 0)
+#define pud_leaf(pud)		((pud_val(pud) & _PAGE_HUGE) != 0)
+
 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
 #define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
-- 
2.33.0