The patch titled Subject: mm/mm_init: fix hash table order logging in alloc_large_system_hash() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-mm_init-fix-hash-table-order-logging-in-alloc_large_system_hash.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

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

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------------------------------------------------------ From: "Isaac J. Manjarres" isaacmanjarres@google.com Subject: mm/mm_init: fix hash table order logging in alloc_large_system_hash() Date: Tue, 28 Oct 2025 12:10:12 -0700

When emitting the order of the allocation for a hash table, alloc_large_system_hash() unconditionally subtracts PAGE_SHIFT from log base 2 of the allocation size. This is not correct if the allocation size is smaller than a page, and yields a negative value for the order as seen below:

TCP established hash table entries: 32 (order: -4, 256 bytes, linear) TCP bind hash table entries: 32 (order: -2, 1024 bytes, linear)

Use get_order() to compute the order when emitting the hash table information to correctly handle cases where the allocation size is smaller than a page:

TCP established hash table entries: 32 (order: 0, 256 bytes, linear) TCP bind hash table entries: 32 (order: 0, 1024 bytes, linear)

Link: https://lkml.kernel.org/r/20251028191020.413002-1-isaacmanjarres@google.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Isaac J. Manjarres isaacmanjarres@google.com Cc: Mike Rapoport rppt@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/mm_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mm_init.c~mm-mm_init-fix-hash-table-order-logging-in-alloc_large_system_hash +++ a/mm/mm_init.c @@ -2469,7 +2469,7 @@ void *__init alloc_large_system_hash(con panic("Failed to allocate %s hash table\n", tablename);

pr_info("%s hash table entries: %ld (order: %d, %lu bytes, %s)\n", - tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size, + tablename, 1UL << log2qty, get_order(size), size, virt ? (huge ? "vmalloc hugepage" : "vmalloc") : "linear");

if (_hash_shift) _

Patches currently in -mm which might be from isaacmanjarres@google.com are

mm-mm_init-fix-hash-table-order-logging-in-alloc_large_system_hash.patch