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| author | Peter Zijlstra <peterz@infradead.org> | 2013-11-14 14:31:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-15 09:32:20 +0900 |
| commit | 57f4257eae33e036125973858934730250d464e3 (patch) | |
| tree | f8011cdf5b2e77abb4c721221793d40ed24985a7 /include/linux/lockref.h | |
| parent | ea1e7ed33708c7a760419ff9ded0a6cb90586a50 (diff) | |
| download | lwn-57f4257eae33e036125973858934730250d464e3.tar.gz lwn-57f4257eae33e036125973858934730250d464e3.zip | |
lockref: use BLOATED_SPINLOCKS to avoid explicit config dependencies
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>
Diffstat (limited to 'include/linux/lockref.h')
| -rw-r--r-- | include/linux/lockref.h | 7 |
1 files changed, 6 insertions, 1 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 { |