The patch titled
Subject: um/mm: remove redundant assignment of max_low_pfn
has been added to the -mm mm-unstable branch. Its filename is
um-mm-remove-redundant-assignment-of-max_low_pfn.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/um-mm-remove-redundant-assignment-of-max_low_pfn.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: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: um/mm: remove redundant assignment of max_low_pfn
Date: Sat, 15 Jun 2024 03:41:50 +0000
Current calculation of max_low_pfn is introduced in commit af84eab20891
("[PATCH] uml: fix LVM crash"). It is intended to set max_low_pfn to the
same value as max_pfn.
But I am not sure why the max_pfn is set to totalram_pages, which
represents the number of usable pages in system instead of an absolute
page frame number. (The change history stops there.)
While we have already calculate it in setup_physmem(), so not necessary to
do it again.
Also this would help changing totalram_pages accounting, since we plan to
move the accounting into __free_pages_core(). With this change,
totalram_pages may not represent the total usable pages at this point,
since some pages would be deferred initialized.
Link: https://lkml.kernel.org/r/20240615034150.2958-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/kernel/mem.c | 1 -
1 file changed, 1 deletion(-)
--- a/arch/um/kernel/mem.c~um-mm-remove-redundant-assignment-of-max_low_pfn
+++ a/arch/um/kernel/mem.c
@@ -73,7 +73,6 @@ void __init mem_init(void)
/* this will put all low memory onto the freelists */
memblock_free_all();
- max_low_pfn = totalram_pages();
max_pfn = max_low_pfn;
kmalloc_ok = 1;
}
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
um-mm-remove-redundant-assignment-of-max_low_pfn.patch
