+ arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable.patch added to mm-unstable branch

+ arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: arch/x86: do not explicitly clear Reserved flag in free_pagetable
has been added to the -mm mm-unstable branch.  Its filename is
     arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Oscar Salvador <osalvador@suse.de>
Subject: arch/x86: do not explicitly clear Reserved flag in free_pagetable
Date: Mon, 27 May 2024 06:45:23 +0200

In free_pagetable() we use the non-atomic version for clearing the
PageReserved bit from the page.  free_pagetable() will either call
free_reserved_page() or put_page_bootmem(), which will eventually end up
calling free_reserved_page(), and in there we already clear the
PageReserved flag.

Link: https://lkml.kernel.org/r/20240527044523.29207-1-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86/mm/init_64.c |    2 --
 1 file changed, 2 deletions(-)

--- a/arch/x86/mm/init_64.c~arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable
+++ a/arch/x86/mm/init_64.c
@@ -980,8 +980,6 @@ static void __meminit free_pagetable(str
 
 	/* bootmem page has reserved flag */
 	if (PageReserved(page)) {
-		__ClearPageReserved(page);
-
 		magic = page->index;
 		if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 			while (nr_pages--)
_

Patches currently in -mm which might be from osalvador@suse.de are

mm-hugetlb-do-not-call-vma_add_reservation-upon-enomem.patch
mm-hugetlb-drop-node_alloc_noretry-from-alloc_fresh_hugetlb_folio.patch
arch-x86-do-not-explicitly-clear-reserved-flag-in-free_pagetable.patch