net_sched: sch_sfq: annotate data-races around q->perturb_period

[ Upstream commit a17ef9e6 ]

sfq_perturbation() reads q->perturb_period locklessly.
Add annotations to fix potential issues.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240430180015.3111398-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 10685681 ("net_sched: sch_sfq: don't allow 1 packet limit")
Signed-off-by: Sasha Levin <sashal@kernel.org>