linux-kernel - Re: [PATCH v1 1/1] spinlock: Fix failing build for PREEMPT

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Date: Tue, 16 Jan 2024 01:02:09 -0300
From: Leonardo Bras <leobras@...hat.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Leonardo Bras <leobras@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] spinlock: Fix failing build for PREEMPT_RT

On Mon, Jan 15, 2024 at 04:54:14PM -0500, Kent Overstreet wrote:
> On Mon, Jan 15, 2024 at 05:19:34PM -0300, Leonardo Bras wrote:
> > Since 1d71b30e1f85 ("sched.h: Move (spin|rwlock)_needbreak() to
> > spinlock.h") build fails for PREEMPT_RT, since there is no definition
> > available of either spin_needbreak() and rwlock_needbreak().
> > 
> > Since it was moved on the mentioned commit, it was placed inside a
> > !PREEMPT_RT part of the code, making it out of reach for an RT kernel.
> > 
> > Fix this by moving code it a few lines down so it can be reached by an
> > RT build, where it can also make use of the *_is_contended() definition
> > added by the spinlock_rt.h.
> > 
> > Fixes: d1d71b30e1f85 ("sched.h: Move (spin|rwlock)_needbreak() to
> > spinlock.h")
> > Signed-off-by: Leonardo Bras <leobras@...hat.com>
> 
> I've picked this up - thanks!
> 

Awesome! Thanks!

Leo