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Subject[PATCH] include/linux/smp_lock.h cleanup 2.5.31 (latest bk)
This is a resend of a patch to cleanup include/linux/smp_lock.h, based
on a patch to do roughly the same to include/asm-i386/smplock.h from
last week.

It's only a cleanup patch, not executable bits were changed. Patch is
against latest bitkeeper (2.5.31+), compiles fine.

- move various defines to static inline functions for type safety of
parameters.
- change __inline__ to inline.
- add kernel_locked_for_task(task) which was implicit before
explicit, and make kernel_locked() use it.
- add do { } while (0) to macros

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.502 -> 1.503
# include/linux/smp_lock.h 1.4 -> 1.5
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/08/21 mulix@alhambra.merseine.nu 1.503
# cleanups for smp_lock.h
# --------------------------------------------
#
diff -Nru a/include/linux/smp_lock.h b/include/linux/smp_lock.h
--- a/include/linux/smp_lock.h Wed Aug 21 12:44:06 2002
+++ b/include/linux/smp_lock.h Wed Aug 21 12:44:06 2002
@@ -9,9 +9,10 @@
#define unlock_kernel() do { } while(0)
#define release_kernel_lock(task) do { } while(0)
#define reacquire_kernel_lock(task) do { } while(0)
-#define kernel_locked() 1
+#define kernel_locked() (1)
+#define kernel_locked_for_task(task) (1)

-#else
+#else /* defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) */

#include <linux/interrupt.h>
#include <linux/spinlock.h>
@@ -20,29 +21,36 @@

extern spinlock_t kernel_flag;

-#define kernel_locked() (current->lock_depth >= 0)
+static inline int kernel_locked_for_task(struct task_struct* task)
+{
+ return (task->lock_depth >= 0);
+}
+
+static inline int kernel_locked(void)
+{
+ return kernel_locked_for_task(current);
+}

-#define get_kernel_lock() spin_lock(&kernel_flag)
-#define put_kernel_lock() spin_unlock(&kernel_flag)
+#define get_kernel_lock() do { spin_lock(&kernel_flag); } while (0)
+#define put_kernel_lock() do { spin_unlock(&kernel_flag); } while (0)

/*
* Release global kernel lock and global interrupt lock
*/
-#define release_kernel_lock(task) \
-do { \
- if (unlikely(task->lock_depth >= 0)) \
- put_kernel_lock(); \
-} while (0)
+static inline void release_kernel_lock(struct task_struct* task)
+{
+ if (unlikely(kernel_locked_for_task(task)))
+ put_kernel_lock();
+}

/*
* Re-acquire the kernel lock
*/
-#define reacquire_kernel_lock(task) \
-do { \
- if (unlikely(task->lock_depth >= 0)) \
- get_kernel_lock(); \
-} while (0)
-
+static inline void reacquire_kernel_lock(struct task_struct* task)
+{
+ if (unlikely(kernel_locked_for_task(task)))
+ get_kernel_lock();
+}

/*
* Getting the big kernel lock.
@@ -51,7 +59,7 @@
* so we only need to worry about other
* CPU's.
*/
-static __inline__ void lock_kernel(void)
+static inline void lock_kernel(void)
{
int depth = current->lock_depth+1;
if (!depth)
@@ -59,14 +67,14 @@
current->lock_depth = depth;
}

-static __inline__ void unlock_kernel(void)
+static inline void unlock_kernel(void)
{
- if (current->lock_depth < 0)
+ if (!kernel_locked())
BUG();
if (--current->lock_depth < 0)
put_kernel_lock();
}

-#endif /* CONFIG_SMP */
+#endif /* CONFIG_SMP || CONFIG_PREEMPT*/

-#endif
+#endif /* __LINUX_SMPLOCK_H */
--
calm down, it's *only* ones and zeros.

http://syscalltrack.sf.net/
http://vipe.technion.ac.il/~mulix/
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