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

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Date: Mon, 15 Jan 2024 16:54:14 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Leonardo Bras <leobras@...hat.com>
Cc: 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 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!