From d6379159f47630813f06f97535cc82ce7b9eed49 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Tue, 8 Nov 2022 18:46:51 +0100
Subject: mm: remove unused savedwrite infrastructure

NUMA hinting no longer uses savedwrite, let's rip it out.

... and while at it, drop __pte_write() and __pmd_write() on ppc64.

Link: https://lkml.kernel.org/r/20221108174652.198904-7-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nadav Amit <namit@vmware.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/debug_vm_pgtable.c | 32 --------------------------------
 1 file changed, 32 deletions(-)

(limited to 'mm/debug_vm_pgtable.c')

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 2b61fde8c38c..c631ade3f1d2 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -171,18 +171,6 @@ static void __init pte_advanced_tests(struct pgtable_debug_args *args)
 	ptep_get_and_clear_full(args->mm, args->vaddr, args->ptep, 1);
 }
 
-static void __init pte_savedwrite_tests(struct pgtable_debug_args *args)
-{
-	pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot_none);
-
-	if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
-		return;
-
-	pr_debug("Validating PTE saved write\n");
-	WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte))));
-	WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte))));
-}
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx)
 {
@@ -302,22 +290,6 @@ static void __init pmd_leaf_tests(struct pgtable_debug_args *args)
 	WARN_ON(!pmd_leaf(pmd));
 }
 
-static void __init pmd_savedwrite_tests(struct pgtable_debug_args *args)
-{
-	pmd_t pmd;
-
-	if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
-		return;
-
-	if (!has_transparent_hugepage())
-		return;
-
-	pr_debug("Validating PMD saved write\n");
-	pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot_none);
-	WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd))));
-	WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd))));
-}
-
 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx)
 {
@@ -451,7 +423,6 @@ static void __init pmd_advanced_tests(struct pgtable_debug_args *args) { }
 static void __init pud_advanced_tests(struct pgtable_debug_args *args) { }
 static void __init pmd_leaf_tests(struct pgtable_debug_args *args) { }
 static void __init pud_leaf_tests(struct pgtable_debug_args *args) { }
-static void __init pmd_savedwrite_tests(struct pgtable_debug_args *args) { }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
@@ -1288,9 +1259,6 @@ static int __init debug_vm_pgtable(void)
 	pmd_leaf_tests(&args);
 	pud_leaf_tests(&args);
 
-	pte_savedwrite_tests(&args);
-	pmd_savedwrite_tests(&args);
-
 	pte_special_tests(&args);
 	pte_protnone_tests(&args);
 	pmd_protnone_tests(&args);
-- 
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