linux-kernel - [PATCH v2 5/7] x86/mm: remove pgd

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Message-ID: <20250331081327.256412-6-bhe@redhat.com>
Date: Mon, 31 Mar 2025 16:13:25 +0800
From: Baoquan He <bhe@...hat.com>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	yanjun.zhu@...ux.dev,
	Baoquan He <bhe@...hat.com>,
	x86@...nel.org
Subject: [PATCH v2 5/7] x86/mm: remove pgd_leaf definition in arch

pgd huge page is not supported yet, let's use the generic definition
in linux/pgtable.h.

And also update the BUILD_BUG_ON() checking for pgd_leaf() in
pti_user_pagetable_walk_p4d() because pgd_leaf() returns boolean value.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: x86@...nel.org
---
 arch/x86/include/asm/pgtable.h | 3 ---
 arch/x86/mm/pti.c              | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 7bd6bd6df4a1..5f4fcc0eea17 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1472,9 +1472,6 @@ static inline bool pgdp_maps_userspace(void *__ptr)
 	return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
 }
 
-#define pgd_leaf	pgd_leaf
-static inline bool pgd_leaf(pgd_t pgd) { return false; }
-
 #ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION
 /*
  * All top-level MITIGATION_PAGE_TABLE_ISOLATION page tables are order-1 pages
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 5f0d579932c6..c2e1de40136f 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -185,7 +185,7 @@ static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
 
 		set_pgd(pgd, __pgd(_KERNPG_TABLE | __pa(new_p4d_page)));
 	}
-	BUILD_BUG_ON(pgd_leaf(*pgd) != 0);
+	BUILD_BUG_ON(pgd_leaf(*pgd));
 
 	return p4d_offset(pgd, address);
 }
-- 
2.41.0