From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 25 Jul 2009 14:18:34 +0000 (+0200)
Subject: locking, oprofile: Annotate oprofilefs lock as raw
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=2d21a29fb62f142b8a62496700d8d82a6a8fd783;p=~shefty%2Frdma-dev.git

locking, oprofile: Annotate oprofilefs lock as raw

The oprofilefs_lock can be taken in atomic context (in profiling
interrupts) and therefore cannot cannot be preempted on -rt -
annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 68894fdc034..96646b3aeca 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -355,10 +355,10 @@ static void nmi_cpu_setup(void *dummy)
 	int cpu = smp_processor_id();
 	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 	nmi_cpu_save_registers(msrs);
-	spin_lock(&oprofilefs_lock);
+	raw_spin_lock(&oprofilefs_lock);
 	model->setup_ctrs(model, msrs);
 	nmi_cpu_setup_mux(cpu, msrs);
-	spin_unlock(&oprofilefs_lock);
+	raw_spin_unlock(&oprofilefs_lock);
 	per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
 	apic_write(APIC_LVTPC, APIC_DM_NMI);
 }
diff --git a/drivers/oprofile/event_buffer.c b/drivers/oprofile/event_buffer.c
index dd87e86048b..c0cc4e7ff02 100644
--- a/drivers/oprofile/event_buffer.c
+++ b/drivers/oprofile/event_buffer.c
@@ -82,10 +82,10 @@ int alloc_event_buffer(void)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&oprofilefs_lock, flags);
+	raw_spin_lock_irqsave(&oprofilefs_lock, flags);
 	buffer_size = oprofile_buffer_size;
 	buffer_watershed = oprofile_buffer_watershed;
-	spin_unlock_irqrestore(&oprofilefs_lock, flags);
+	raw_spin_unlock_irqrestore(&oprofilefs_lock, flags);
 
 	if (buffer_watershed >= buffer_size)
 		return -EINVAL;
diff --git a/drivers/oprofile/oprofile_perf.c b/drivers/oprofile/oprofile_perf.c
index 94796f39bc4..da14432806c 100644
--- a/drivers/oprofile/oprofile_perf.c
+++ b/drivers/oprofile/oprofile_perf.c
@@ -160,9 +160,9 @@ static int oprofile_perf_create_files(struct super_block *sb, struct dentry *roo
 
 static int oprofile_perf_setup(void)
 {
-	spin_lock(&oprofilefs_lock);
+	raw_spin_lock(&oprofilefs_lock);
 	op_perf_setup();
-	spin_unlock(&oprofilefs_lock);
+	raw_spin_unlock(&oprofilefs_lock);
 	return 0;
 }
 
diff --git a/drivers/oprofile/oprofilefs.c b/drivers/oprofile/oprofilefs.c
index e9ff6f7770b..d0de6cc2d7a 100644
--- a/drivers/oprofile/oprofilefs.c
+++ b/drivers/oprofile/oprofilefs.c
@@ -21,7 +21,7 @@
 
 #define OPROFILEFS_MAGIC 0x6f70726f
 
-DEFINE_SPINLOCK(oprofilefs_lock);
+DEFINE_RAW_SPINLOCK(oprofilefs_lock);
 
 static struct inode *oprofilefs_get_inode(struct super_block *sb, int mode)
 {
@@ -76,9 +76,9 @@ int oprofilefs_ulong_from_user(unsigned long *val, char const __user *buf, size_
 	if (copy_from_user(tmpbuf, buf, count))
 		return -EFAULT;
 
-	spin_lock_irqsave(&oprofilefs_lock, flags);
+	raw_spin_lock_irqsave(&oprofilefs_lock, flags);
 	*val = simple_strtoul(tmpbuf, NULL, 0);
-	spin_unlock_irqrestore(&oprofilefs_lock, flags);
+	raw_spin_unlock_irqrestore(&oprofilefs_lock, flags);
 	return 0;
 }
 
diff --git a/include/linux/oprofile.h b/include/linux/oprofile.h
index 49c8727eeb5..a4c562453f6 100644
--- a/include/linux/oprofile.h
+++ b/include/linux/oprofile.h
@@ -166,7 +166,7 @@ ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t co
 int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
 
 /** lock for read/write safety */
-extern spinlock_t oprofilefs_lock;
+extern raw_spinlock_t oprofilefs_lock;
 
 /**
  * Add the contents of a circular buffer to the event buffer.