linux-kernel - [RFC][PATCH 8/8] x86/mm: Remove now unused SHARED_KERNEL

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Message-Id: <20250123172441.2DFF8BCA@davehans-spike.ostc.intel.com>
Date: Thu, 23 Jan 2025 09:24:41 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org,tglx@...utronix.de,bp@...en8.de,joro@...tes.org,luto@...nel.org,peterz@...radead.org,kirill.shutemov@...ux.intel.com,rick.p.edgecombe@...el.com,jgross@...e.com,Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [RFC][PATCH 8/8] x86/mm: Remove now unused SHARED_KERNEL_PMD


From: Dave Hansen <dave.hansen@...ux.intel.com>

All the users of SHARED_KERNEL_PMD are gone. Zap it.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/arch/x86/include/asm/pgtable-2level_types.h |    2 --
 b/arch/x86/include/asm/pgtable-3level_types.h |    2 --
 b/arch/x86/include/asm/pgtable_64_types.h     |    2 --
 3 files changed, 6 deletions(-)

diff -puN arch/x86/include/asm/pgtable-2level_types.h~zap-SHARED_KERNEL_PMD arch/x86/include/asm/pgtable-2level_types.h
--- a/arch/x86/include/asm/pgtable-2level_types.h~zap-SHARED_KERNEL_PMD	2025-01-23 09:20:53.502449700 -0800
+++ b/arch/x86/include/asm/pgtable-2level_types.h	2025-01-23 09:20:53.506449845 -0800
@@ -18,8 +18,6 @@ typedef union {
 } pte_t;
 #endif	/* !__ASSEMBLY__ */
 
-#define SHARED_KERNEL_PMD	0
-
 #define ARCH_PAGE_TABLE_SYNC_MASK	PGTBL_PMD_MODIFIED
 
 /*
diff -puN arch/x86/include/asm/pgtable-3level_types.h~zap-SHARED_KERNEL_PMD arch/x86/include/asm/pgtable-3level_types.h
--- a/arch/x86/include/asm/pgtable-3level_types.h~zap-SHARED_KERNEL_PMD	2025-01-23 09:20:53.502449700 -0800
+++ b/arch/x86/include/asm/pgtable-3level_types.h	2025-01-23 09:20:53.506449845 -0800
@@ -27,8 +27,6 @@ typedef union {
 } pmd_t;
 #endif	/* !__ASSEMBLY__ */
 
-#define SHARED_KERNEL_PMD	(!static_cpu_has(X86_FEATURE_PTI))
-
 #define ARCH_PAGE_TABLE_SYNC_MASK	PGTBL_PMD_MODIFIED
 
 /*
diff -puN arch/x86/include/asm/pgtable_64_types.h~zap-SHARED_KERNEL_PMD arch/x86/include/asm/pgtable_64_types.h
--- a/arch/x86/include/asm/pgtable_64_types.h~zap-SHARED_KERNEL_PMD	2025-01-23 09:20:53.506449845 -0800
+++ b/arch/x86/include/asm/pgtable_64_types.h	2025-01-23 09:20:53.506449845 -0800
@@ -46,8 +46,6 @@ extern unsigned int ptrs_per_p4d;
 
 #endif	/* !__ASSEMBLY__ */
 
-#define SHARED_KERNEL_PMD	0
-
 #ifdef CONFIG_X86_5LEVEL
 
 /*
_