linux-kernel - [PATCH v2 1/3] arch/x86: Drop own definition of pgd,p4d

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Message-ID: <bcd6ab8246348f18fdc77694e321ee6458f05781.1720597744.git.christophe.leroy@csgroup.eu>
Date: Wed, 10 Jul 2024 09:51:20 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	x86@...nel.org,
	linux-riscv@...ts.infradead.org,
	Oscar Salvador <osalvador@...e.de>,
	Peter Xu <peterx@...hat.com>
Subject: [PATCH v2 1/3] arch/x86: Drop own definition of pgd,p4d_leaf

From: Oscar Salvador <osalvador@...e.de>

We provide generic definitions of pXd_leaf in pgtable.h when the arch
do not define their own, where the generic pXd_leaf always return false.

Although x86 defines {pgd,p4d}_leaf, they end up being a no-op, so drop them
and make them fallback to the generic one.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/x86/include/asm/pgtable.h | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 65b8e5bb902c..772f778bac06 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -252,13 +252,6 @@ static inline unsigned long pgd_pfn(pgd_t pgd)
 	return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
 }
 
-#define p4d_leaf p4d_leaf
-static inline bool p4d_leaf(p4d_t p4d)
-{
-	/* No 512 GiB pages yet */
-	return 0;
-}
-
 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
 
 #define pmd_leaf pmd_leaf
@@ -1396,9 +1389,6 @@ 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
-- 
2.44.0