From: Peter Zijlstra <pet...@infradead.org>
Avoid the fragile Kconfig construct guestimating spinlock_t sizes; use a
friendly compile-time test to determine this.
Signed-off-by: Peter Zijlstra <pet...@infradead.org>
[kirill.shute...@linux.intel.com: drop CONFIG_CMPXCHG_LOCKREF]
Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
---
include/linux/lockref.h | 7 ++++++-
lib/Kconfig | 7 -------
lib/lockref.c | 2 +-
3 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index 13dfd36a3294..c8929c3832db 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -15,10 +15,15 @@
*/
#include <linux/spinlock.h>
+#include <generated/bounds.h>
+
+#define USE_CMPXCHG_LOCKREF \
+ (IS_ENABLED(CONFIG_ARCH_USE_CMPXCHG_LOCKREF) && \
+ IS_ENABLED(CONFIG_SMP) && !BLOATED_SPINLOCKS)
struct lockref {
union {
-#ifdef CONFIG_CMPXCHG_LOCKREF
+#if USE_CMPXCHG_LOCKREF
aligned_u64 lock_count;
#endif
struct {
diff --git a/lib/Kconfig b/lib/Kconfig
index a16fdb50c252..7c1721ec4909 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -51,13 +51,6 @@ config PERCPU_RWSEM
config ARCH_USE_CMPXCHG_LOCKREF
bool
-config CMPXCHG_LOCKREF
- def_bool y if ARCH_USE_CMPXCHG_LOCKREF
- depends on SMP
- depends on !GENERIC_LOCKBREAK
- depends on !DEBUG_SPINLOCK
- depends on !DEBUG_LOCK_ALLOC
-
config CRC_CCITT
tristate "CRC-CCITT functions"
help
diff --git a/lib/lockref.c b/lib/lockref.c
index af6e95d0bed6..d2b123f8456b 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -1,7 +1,7 @@
#include <linux/export.h>
#include <linux/lockref.h>
-#ifdef CONFIG_CMPXCHG_LOCKREF
+#if USE_CMPXCHG_LOCKREF
/*
* Allow weakly-ordered memory architectures to provide barrier-less
--
1.8.4.2
--
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