From: Martin Schwidefsky <[email protected]>
[patch 8/13] s390: spinlock fixes.
Remove useless spin_retry_counter and fix compilation for UP kernels.
Signed-off-by: Martin Schwidefsky <[email protected]>
---
arch/s390/lib/Makefile | 3 ++-
arch/s390/lib/spinlock.c | 7 -------
kernel/sysctl.c | 2 +-
3 files changed, 3 insertions(+), 9 deletions(-)
diff -urpN linux-2.6/arch/s390/lib/Makefile linux-2.6-patched/arch/s390/lib/Makefile
--- linux-2.6/arch/s390/lib/Makefile 2006-01-12 15:43:19.000000000 +0100
+++ linux-2.6-patched/arch/s390/lib/Makefile 2006-01-12 15:43:58.000000000 +0100
@@ -4,5 +4,6 @@
EXTRA_AFLAGS := -traditional
-lib-y += delay.o string.o spinlock.o
+lib-y += delay.o string.o
lib-y += $(if $(CONFIG_64BIT),uaccess64.o,uaccess.o)
+lib-$(CONFIG_SMP) += spinlock.o
\ No newline at end of file
diff -urpN linux-2.6/arch/s390/lib/spinlock.c linux-2.6-patched/arch/s390/lib/spinlock.c
--- linux-2.6/arch/s390/lib/spinlock.c 2006-01-12 15:43:19.000000000 +0100
+++ linux-2.6-patched/arch/s390/lib/spinlock.c 2006-01-12 15:43:58.000000000 +0100
@@ -13,7 +13,6 @@
#include <linux/init.h>
#include <asm/io.h>
-atomic_t spin_retry_counter;
int spin_retry = 1000;
/**
@@ -45,7 +44,6 @@ _raw_spin_lock_wait(raw_spinlock_t *lp,
_diag44();
count = spin_retry;
}
- atomic_inc(&spin_retry_counter);
if (_raw_compare_and_swap(&lp->lock, 0, pc) == 0)
return;
}
@@ -58,7 +56,6 @@ _raw_spin_trylock_retry(raw_spinlock_t *
int count = spin_retry;
while (count-- > 0) {
- atomic_inc(&spin_retry_counter);
if (_raw_compare_and_swap(&lp->lock, 0, pc) == 0)
return 1;
}
@@ -77,7 +74,6 @@ _raw_read_lock_wait(raw_rwlock_t *rw)
_diag44();
count = spin_retry;
}
- atomic_inc(&spin_retry_counter);
old = rw->lock & 0x7fffffffU;
if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
return;
@@ -92,7 +88,6 @@ _raw_read_trylock_retry(raw_rwlock_t *rw
int count = spin_retry;
while (count-- > 0) {
- atomic_inc(&spin_retry_counter);
old = rw->lock & 0x7fffffffU;
if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
return 1;
@@ -111,7 +106,6 @@ _raw_write_lock_wait(raw_rwlock_t *rw)
_diag44();
count = spin_retry;
}
- atomic_inc(&spin_retry_counter);
if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
return;
}
@@ -124,7 +118,6 @@ _raw_write_trylock_retry(raw_rwlock_t *r
int count = spin_retry;
while (count-- > 0) {
- atomic_inc(&spin_retry_counter);
if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
return 1;
}
diff -urpN linux-2.6/kernel/sysctl.c linux-2.6-patched/kernel/sysctl.c
--- linux-2.6/kernel/sysctl.c 2006-01-12 15:43:35.000000000 +0100
+++ linux-2.6-patched/kernel/sysctl.c 2006-01-12 15:43:58.000000000 +0100
@@ -648,7 +648,7 @@ static ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
-#if defined(CONFIG_S390)
+#if defined(CONFIG_S390) && defined(CONFIG_SMP)
{
.ctl_name = KERN_SPIN_RETRY,
.procname = "spin_retry",
-
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