Messages in this thread | | | Date | Sat, 13 Aug 2022 15:43:34 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH AUTOSEL 4.19 14/14] fs/dcache: Disable preemption on i_dir_seq write side on PREEMPT_RT |
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Hi!
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > > [ 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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