linux-kernel - [PATCH RFC 13/24] bit_spinlock: Include missing <asm/processor.h>

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Message-ID: <20250206181711.1902989-14-elver@google.com>
Date: Thu,  6 Feb 2025 19:10:07 +0100
From: Marco Elver <elver@...gle.com>
To: elver@...gle.com
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Alexander Potapenko <glider@...gle.com>, 
	Bart Van Assche <bvanassche@....org>, Bill Wendling <morbo@...gle.com>, Boqun Feng <boqun.feng@...il.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Frederic Weisbecker <frederic@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ingo Molnar <mingo@...nel.org>, 
	Jann Horn <jannh@...gle.com>, Joel Fernandes <joel@...lfernandes.org>, 
	Jonathan Corbet <corbet@....net>, Josh Triplett <josh@...htriplett.org>, 
	Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Uladzislau Rezki <urezki@...il.com>, Waiman Long <longman@...hat.com>, 
	Will Deacon <will@...nel.org>, kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, rcu@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: [PATCH RFC 13/24] bit_spinlock: Include missing <asm/processor.h>

Including <linux/bit_spinlock.h> into an empty TU will result in the
compiler complaining:

./include/linux/bit_spinlock.h:34:4: error: call to undeclared function 'cpu_relax'; <...>
   34 |                         cpu_relax();
      |                         ^
1 error generated.

Include <asm/processor.h> to allow including bit_spinlock.h where
<asm/processor.h> is not otherwise included.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 include/linux/bit_spinlock.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/bit_spinlock.h b/include/linux/bit_spinlock.h
index bbc4730a6505..f1174a2fcc4d 100644
--- a/include/linux/bit_spinlock.h
+++ b/include/linux/bit_spinlock.h
@@ -7,6 +7,8 @@
 #include <linux/atomic.h>
 #include <linux/bug.h>
 
+#include <asm/processor.h>  /* for cpu_relax() */
+
 /*
  *  bit-based spin_lock()
  *
-- 
2.48.1.502.g6dc24dfdaf-goog