linux-kernel - [PATCH 7/8] x86/mm: Remove duplicated PMD preallocation macro

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Message-Id: <20250414173242.5ED13A5B@davehans-spike.ostc.intel.com>
Date: Mon, 14 Apr 2025 10:32:42 -0700
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: [PATCH 7/8] x86/mm: Remove duplicated PMD preallocation macro


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

MAX_PREALLOCATED_PMDS and PREALLOCATED_PMDS are now identical. Just
use PREALLOCATED_PMDS and remove "MAX".

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

 b/arch/x86/mm/pgtable.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff -puN arch/x86/mm/pgtable.c~simplify-PREALLOCATED_PMDS-4 arch/x86/mm/pgtable.c
--- a/arch/x86/mm/pgtable.c~simplify-PREALLOCATED_PMDS-4	2025-04-09 11:49:42.535989732 -0700
+++ b/arch/x86/mm/pgtable.c	2025-04-09 11:49:42.538989843 -0700
@@ -118,7 +118,6 @@ static void pgd_dtor(pgd_t *pgd)
  * new process's life, we just pre-populate them here.
  */
 #define PREALLOCATED_PMDS	PTRS_PER_PGD
-#define MAX_PREALLOCATED_PMDS	PTRS_PER_PGD
 
 /*
  * "USER_PMDS" are the PMDs for the user copy of the page tables when
@@ -154,7 +153,6 @@ void pud_populate(struct mm_struct *mm,
 
 /* No need to prepopulate any pagetable entries in non-PAE modes. */
 #define PREALLOCATED_PMDS	0
-#define MAX_PREALLOCATED_PMDS	0
 #define PREALLOCATED_USER_PMDS	 0
 #define MAX_PREALLOCATED_USER_PMDS 0
 #endif	/* CONFIG_X86_PAE */
@@ -324,7 +322,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
 {
 	pgd_t *pgd;
 	pmd_t *u_pmds[MAX_PREALLOCATED_USER_PMDS];
-	pmd_t *pmds[MAX_PREALLOCATED_PMDS];
+	pmd_t *pmds[PREALLOCATED_PMDS];
 
 	pgd = _pgd_alloc(mm);
 
_