On 12/19/25 7:40 AM, Marco Elver wrote:
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 <[email protected]>
---
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 c0989b5b0407..59e345f74b0e 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()
*
The abbreviation "TU" is uncommon so it's probably a good idea to expand
it. Anyway:
Reviewed-by: Bart Van Assche <[email protected]>
