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[ Upstream commit e61e6c415ba9ff2b32bb6780ce1b17d1d76238f1 ] The overflow_work is using system wq to do overflow checks and updates for PHC device timecounter, which might be overhelmed by other tasks. But there is dedicated kthread in PTP subsystem designed for such things. This patch changes the work queue to proper align with PTP subsystem and to avoid overloading system work queue. The adjfine() function acts the same way as overflow check worker, we can postpone ptp aux worker till the next overflow period after adjfine() was called. Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com> Signed-off-by: Vadim Fedorenko <vadfed@meta.com> Acked-by: Tariq Toukan <tariqt@nvidia.com> Link: https://patch.msgid.link/20250107104812.380225-1-vadfed@meta.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>