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Date: Tue, 20 Aug 2019 20:01:14 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Matthew Wilcox <willy@...radead.org> cc: Sebastian Siewior <bigeasy@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Anna-Maria Gleixner <anna-maria@...utronix.de>, Steven Rostedt <rostedt@...dmis.org>, Julia Cartwright <julia@...com>, Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>, Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.com>, Mark Fasheh <mark@...heh.com>, Joseph Qi <joseph.qi@...ux.alibaba.com>, Christoph Hellwig <hch@...radead.org>, Joel Becker <jlbec@...lplan.org> Subject: Re: [PATCH] fs/buffer: Make BH_Uptodate_Lock bit_spin_lock a regular spinlock_t On Tue, 20 Aug 2019, Matthew Wilcox wrote: > On Tue, Aug 20, 2019 at 07:08:18PM +0200, Sebastian Siewior wrote: > > Bit spinlocks are problematic if PREEMPT_RT is enabled, because they > > disable preemption, which is undesired for latency reasons and breaks when > > regular spinlocks are taken within the bit_spinlock locked region because > > regular spinlocks are converted to 'sleeping spinlocks' on RT. So RT > > replaces the bit spinlocks with regular spinlocks to avoid this problem. > > Bit spinlocks are also not covered by lock debugging, e.g. lockdep. > > > > Substitute the BH_Uptodate_Lock bit spinlock with a regular spinlock. > > > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de> > > [bigeasy: remove the wrapper and use always spinlock_t] > > Uhh ... always grow the buffer_head, even for non-PREEMPT_RT? Why? Christoph requested that: https://lkml.kernel.org/r/20190802075612.GA20962@infradead.org Thanks, tglx
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