locking/refcounts: Include fewer headers in <linux/refcount.h>
Debloat <linux/refcount.h>'s dependencies:
- <linux/kernel.h> is not needed, but <linux/compiler.h> is.
- <linux/mutex.h> is not needed, only a forward declaration of "struct mutex".
- <linux/spinlock.h> is not needed, <linux/spinlock_types.h> is enough.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/lkml/20180331220036.GA7676@avx2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/x86/include/asm/refcount.h b/arch/x86/include/asm/refcount.h
index 4cf11d8..19b9052 100644
--- a/arch/x86/include/asm/refcount.h
+++ b/arch/x86/include/asm/refcount.h
@@ -5,6 +5,7 @@
* PaX/grsecurity.
*/
#include <linux/refcount.h>
+#include <asm/bug.h>
/*
* This is the first portion of the refcount error handling, which lives in
diff --git a/include/linux/refcount.h b/include/linux/refcount.h
index 4193c41..c36addd 100644
--- a/include/linux/refcount.h
+++ b/include/linux/refcount.h
@@ -3,9 +3,10 @@
#define _LINUX_REFCOUNT_H
#include <linux/atomic.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/spinlock_types.h>
+
+struct mutex;
/**
* struct refcount_t - variant of atomic_t specialized for reference counts
diff --git a/lib/refcount.c b/lib/refcount.c
index 0eb4835..4bd842f 100644
--- a/lib/refcount.c
+++ b/lib/refcount.c
@@ -35,7 +35,9 @@
*
*/
+#include <linux/mutex.h>
#include <linux/refcount.h>
+#include <linux/spinlock.h>
#include <linux/bug.h>
#ifdef CONFIG_REFCOUNT_FULL
