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lockref: use BLOATED_SPINLOCKS to avoid explicit config dependencies

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Avoid the fragile Kconfig construct guestimating spinlock_t sizes; use a
friendly compile-time test to determine this.

[kirill.shutemov@linux.intel.com: drop CONFIG_CMPXCHG_LOCKREF]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2013-11-14 14:31:54 -08:00 committed by Linus Torvalds
parent ea1e7ed337
commit 57f4257eae
3 changed files with 7 additions and 9 deletions
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7
include/linux/lockref.h
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@ -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 {

7
lib/Kconfig
View File

@ -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

2
lib/lockref.c
View File

@ -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