linux-kernel - [PATCH RFC 02/14] mm: drop highest_memmap

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Message-ID: <20250617154345.2494405-3-david@redhat.com>
Date: Tue, 17 Jun 2025 17:43:33 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	nvdimm@...ts.linux.dev,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Alistair Popple <apopple@...dia.com>,
	Matthew Wilcox <willy@...radead.org>,
	Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Zi Yan <ziy@...dia.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Nico Pache <npache@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>,
	Barry Song <baohua@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>
Subject: [PATCH RFC 02/14] mm: drop highest_memmap_pfn

Now unused, so let's drop it.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/internal.h | 2 --
 mm/memory.c   | 2 --
 mm/mm_init.c  | 3 ---
 mm/nommu.c    | 1 -
 4 files changed, 8 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index f519eb7217c26..703871905fd6d 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -503,8 +503,6 @@ static inline bool folio_needs_release(struct folio *folio)
 		(mapping && mapping_release_always(mapping));
 }
 
-extern unsigned long highest_memmap_pfn;
-
 /*
  * Maximum number of reclaim retries without progress before the OOM
  * killer is consider the only way forward.
diff --git a/mm/memory.c b/mm/memory.c
index 188b84ebf479a..a1b5575db52ac 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -146,8 +146,6 @@ __setup("norandmaps", disable_randmaps);
 unsigned long zero_pfn __read_mostly;
 EXPORT_SYMBOL(zero_pfn);
 
-unsigned long highest_memmap_pfn __read_mostly;
-
 /*
  * CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()
  */
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 5c21b3af216b2..1dac66c209984 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -881,9 +881,6 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone
 	unsigned long pfn, end_pfn = start_pfn + size;
 	struct page *page;
 
-	if (highest_memmap_pfn < end_pfn - 1)
-		highest_memmap_pfn = end_pfn - 1;
-
 #ifdef CONFIG_ZONE_DEVICE
 	/*
 	 * Honor reservation requested by the driver for this ZONE_DEVICE
diff --git a/mm/nommu.c b/mm/nommu.c
index 38c22ea0a95c6..cd9ddbfe1af80 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -42,7 +42,6 @@
 #include <asm/mmu_context.h>
 #include "internal.h"
 
-unsigned long highest_memmap_pfn;
 int heap_stack_gap = 0;
 
 atomic_long_t mmap_pages_allocated;
-- 
2.49.0