[PATCH v1 0/2] net: xfrm: Use seqcount_spinlock_t

From: Ahmed S. Darwish
Date: Tue Mar 16 2021 - 06:58:34 EST


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.



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