[PATCH] s390: spinlock fixes

Remove useless spin_retry_counter and fix compilation for UP kernels.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index d9b97b3c597f2eb90e694ba385f3f61814c54c35..f20b51ff1d86ee24b9c65a098781d58d0c688387 100644 (file)
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -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 --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index 68d79c50208172cfdaea271ab61f335099749b5f..60f80a4eed4e52cfc99756738024738a42537237 100644 (file)
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -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, unsigned int pc)
                        _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 *lp, unsigned int pc)
        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 *rw)
        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 --git a/kernel/sysctl.c b/kernel/sysctl.c
index 62d4d9566876eb9e32199c3969d61d306543d708..f5d69b6e29f50fb051b8ecf1add5964865c105f4 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -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",