Hi! > From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> > > [ Upstream commit cf634d540a29018e8d69ab1befb7e08182bc6594 ] > > i_dir_seq is a sequence counter with a lock which is represented by the > lowest bit. The writer atomically updates the counter which ensures that it > can be modified by only one writer at a time. This requires preemption to > be disabled across the write side critical section. > > On !PREEMPT_RT kernels this is implicit by the caller acquiring > dentry::lock. On PREEMPT_RT kernels spin_lock() does not disable preemption This should not be applied to 4.19 as CONFIG_PREEMPT_RT does not exist there. Best regards, Pavel -- 'DENX Software Engineering GmbH, Managing Director: Wolfgang Denk' 'HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany'
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