linux-kernel - [PATCH v1 0/5] MM_CID and HPCC mm

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Message-Id: <20251221232926.450602-1-mathieu.desnoyers@efficios.com>
Date: Sun, 21 Dec 2025 18:29:21 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Mark Brown <broonie@...nel.org>,
	linux-mm@...ck.org
Subject: [PATCH v1 0/5] MM_CID and HPCC mm_struct static init fixes

Hi Andrew,

Mark Brown reported a regression [1] on linux next due to the
hierarchical percpu counters (HPCC). You mentioned they were only in
mm-new (and therefore not pulled into -next) [2], but it looks like they
got more exposure that we expected. :)

This bug hunting got me to fix static initialization issues in both
MM_CID (for upstream) and HPCC (mm-new). Mark tested my series and
confirmed that it fixes his issues.

Please consider the HPCC fixes for mm-new, and the MM_CID fixes for
upstream.

This series is based on mm-new
commit 287373d0b6ee ("selftests/mm: fix comment for check_test_requirements")

Thanks,

Mathieu

Link: https://lore.kernel.org/lkml/c8acf650-ef96-4449-ba85-557dedba0ffc@sirena.org.uk/ # [1]
Link: https://lore.kernel.org/lkml/20251122111336.56b060c86ff6ba41fe76bfd4@linux-foundation.org/ [2]
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mark Brown <broonie@...nel.org>
Cc: linux-mm@...ck.org

Mathieu Desnoyers (5):
  mm: Add missing static initializer for init_mm::mm_cid.lock
  mm: Rename cpu_bitmap field to flexible_array
  mm: Take into account mm_cid size for mm_struct static definitions
  mm: Take into account hierarchical percpu tree items for static
    mm_struct definitions
  tsacct: Skip all kernel threads

 drivers/firmware/efi/efi.c          |  2 +-
 include/linux/mm.h                  |  2 +-
 include/linux/mm_types.h            | 18 +++++++---
 include/linux/percpu_counter_tree.h | 51 +++++++++++++++++++++++++++++
 kernel/tsacct.c                     |  2 +-
 mm/init-mm.c                        |  5 ++-
 6 files changed, 71 insertions(+), 9 deletions(-)

-- 
2.39.5