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authorTony Luck <tony.luck@intel.com>2009-09-25 08:42:16 -0700
committerTony Luck <tony.luck@intel.com>2009-09-25 08:42:16 -0700
commit2c86963b093c1a0887dfc6b32c6e5ea3a80f2922 (patch)
treed1ed58dd0a644dd670e3724a575112fedd4b4250 /arch/ia64/kernel/ia64_ksyms.c
parent53cddfcc0e760d2b364878b6dadbd0c6d087cfae (diff)
downloadop-kernel-dev-2c86963b093c1a0887dfc6b32c6e5ea3a80f2922.zip
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[IA64] implement ticket locks for Itanium
Back in January 2008 Nick Piggin implemented "ticket" spinlocks for X86 (See commit 314cdbefd1fd0a7acf3780e9628465b77ea6a836). IA64 implementation has a couple of differences because of the available atomic operations ... e.g. we have no fetchadd2 instruction that operates on a 16-bit quantity so we make ticket locks use a 32-bit word for each of the current ticket and now-serving values. Performance on uncontended locks is about 8% worse than the previous implementation, but this seems a good trade for determinism in the contended case. Performance impact on macro-level benchmarks is in the noise. Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/ia64_ksyms.c')
-rw-r--r--arch/ia64/kernel/ia64_ksyms.c20
1 files changed, 0 insertions, 20 deletions
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index 8ebccb5..14d39e3 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -84,26 +84,6 @@ EXPORT_SYMBOL(ia64_save_scratch_fpregs);
#include <asm/unwind.h>
EXPORT_SYMBOL(unw_init_running);
-#ifdef ASM_SUPPORTED
-# ifdef CONFIG_SMP
-# if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
-/*
- * This is not a normal routine and we don't want a function descriptor for it, so we use
- * a fake declaration here.
- */
-extern char ia64_spinlock_contention_pre3_4;
-EXPORT_SYMBOL(ia64_spinlock_contention_pre3_4);
-# else
-/*
- * This is not a normal routine and we don't want a function descriptor for it, so we use
- * a fake declaration here.
- */
-extern char ia64_spinlock_contention;
-EXPORT_SYMBOL(ia64_spinlock_contention);
-# endif
-# endif
-#endif
-
#if defined(CONFIG_IA64_ESI) || defined(CONFIG_IA64_ESI_MODULE)
extern void esi_call_phys (void);
EXPORT_SYMBOL_GPL(esi_call_phys);
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