linux-kernel - [PATCH v1 0/2] net: xfrm: Use seqcount_spinlock

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Date:   Tue, 16 Mar 2021 11:56:28 +0100
From:   "Ahmed S. Darwish" <a.darwish@...utronix.de>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "Sebastian A. Siewior" <sebastian.siewior@...utronix.de>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>
Subject: [PATCH v1 0/2] net: xfrm: Use seqcount_spinlock_t

Hi,

This is a small series to trasform xfrm_state_hash_generation sequence
counter to seqcount_spinlock_t, instead of plain seqcount_t.

In general, seqcount_LOCKNAME_t sequence counters allows to associate
the lock used for write serialization with the seqcount. This enables
lockdep to verify that the write serialization lock is always held
before entering the seqcount write section.

If lockdep is disabled, this lock association is compiled out and has
neither storage size nor runtime overhead.

The first patch is a general mainline fix, and has a Fixes tag.

Thanks,

8<----------

Ahmed S. Darwish (2):
  net: xfrm: Localize sequence counter per network namespace
  net: xfrm: Use sequence counter with associated spinlock

 include/net/netns/xfrm.h |  4 +++-
 net/xfrm/xfrm_state.c    | 11 ++++++-----
 2 files changed, 9 insertions(+), 6 deletions(-)

base-commit: 1e28eed17697bcf343c6743f0028cc3b5dd88bf0
--
2.30.2