linux-kernel - [tip: locking/core] bit_spinlock: Include missing <asm/processor.h>

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Message-ID: <176762847561.510.14280897271476618370.tip-bot2@tip-bot2>
Date: Mon, 05 Jan 2026 15:54:35 -0000
From: "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Marco Elver <elver@...gle.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Bart Van Assche <bvanassche@....org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/core] bit_spinlock: Include missing <asm/processor.h>

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     5f7ba059710609bb997d50775ba92fbf29be51da
Gitweb:        https://git.kernel.org/tip/5f7ba059710609bb997d50775ba92fbf29be51da
Author:        Marco Elver <elver@...gle.com>
AuthorDate:    Fri, 19 Dec 2025 16:40:01 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 05 Jan 2026 16:43:29 +01:00

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Link: https://patch.msgid.link/20251219154418.3592607-13-elver@google.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 c0989b5..59e345f 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()
  *