[merged mm-stable] sparc-mm-fix-max_order-usage-in-tsb_grow.patch removed from -mm tree

[merged mm-stable] sparc-mm-fix-max_order-usage-in-tsb_grow.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: sparc/mm: fix MAX_ORDER usage in tsb_grow()
has been removed from the -mm tree.  Its filename was
     sparc-mm-fix-max_order-usage-in-tsb_grow.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: sparc/mm: fix MAX_ORDER usage in tsb_grow()
Date: Wed, 15 Mar 2023 14:31:24 +0300

Patch series "Fix confusion around MAX_ORDER".

MAX_ORDER currently defined as number of orders page allocator supports:
user can ask buddy allocator for page order between 0 and MAX_ORDER-1.

This definition is counter-intuitive and lead to number of bugs all over
the kernel.

Fix the bugs and then change the definition of MAX_ORDER to be
inclusive: the range of orders user can ask from buddy allocator is
0..MAX_ORDER now.


This patch (of 10):

MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in tsb_grow().

Link: https://lkml.kernel.org/r/20230315113133.11326-1-kirill.shutemov@linux.intel.com
Link: https://lkml.kernel.org/r/20230315113133.11326-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: David Miller <davem@davemloft.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/sparc/mm/tsb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/sparc/mm/tsb.c~sparc-mm-fix-max_order-usage-in-tsb_grow
+++ a/arch/sparc/mm/tsb.c
@@ -402,8 +402,8 @@ void tsb_grow(struct mm_struct *mm, unsi
 	unsigned long new_rss_limit;
 	gfp_t gfp_flags;
 
-	if (max_tsb_size > (PAGE_SIZE << MAX_ORDER))
-		max_tsb_size = (PAGE_SIZE << MAX_ORDER);
+	if (max_tsb_size > (PAGE_SIZE << (MAX_ORDER - 1)))
+		max_tsb_size = (PAGE_SIZE << (MAX_ORDER - 1));
 
 	new_cache_index = 0;
 	for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) {
_

Patches currently in -mm which might be from kirill.shutemov@linux.intel.com are