Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / include / linux / smp.h

diff --git a/include/linux/smp.h b/include/linux/smp.h
index dcf1db3..e2fa3ab 100644 (file)
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -17,7 +17,6 @@ extern void cpu_idle(void);
 #include <linux/compiler.h>
 #include <linux/thread_info.h>
 #include <asm/smp.h>
-#include <asm/bug.h>
 
 /*
  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
@@ -53,23 +52,12 @@ extern void smp_cpus_done(unsigned int max_cpus);
 /*
  * Call a function on all other processors
  */
-extern int smp_call_function (void (*func) (void *info), void *info,
-                             int retry, int wait);
+int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
 
 /*
  * Call a function on all processors
  */
-static inline int on_each_cpu(void (*func) (void *info), void *info,
-                             int retry, int wait)
-{
-       int ret = 0;
-
-       preempt_disable();
-       ret = smp_call_function(func, info, retry, wait);
-       func(info);
-       preempt_enable();
-       return ret;
-}
+int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
 
 #define MSG_ALL_BUT_SELF       0x8000  /* Assume <32768 CPU's */
 #define MSG_ALL                        0x8001
@@ -92,13 +80,20 @@ void smp_prepare_boot_cpu(void);
 /*
  *     These macros fold the SMP functionality into a single CPU system
  */
-
-#if !defined(__smp_processor_id) || !defined(CONFIG_PREEMPT)
-# define smp_processor_id()                    0
-#endif
+#define raw_smp_processor_id()                 0
 #define hard_smp_processor_id()                        0
-#define smp_call_function(func,info,retry,wait)        ({ 0; })
-#define on_each_cpu(func,info,retry,wait)      ({ func(info); 0; })
+static inline int up_smp_call_function(void)
+{
+       return 0;
+}
+#define smp_call_function(func,info,retry,wait)        (up_smp_call_function())
+#define on_each_cpu(func,info,retry,wait)      \
+       ({                                      \
+               local_irq_disable();            \
+               func(info);                     \
+               local_irq_enable();             \
+               0;                              \
+       })
 static inline void smp_send_reschedule(int cpu) { }
 #define num_booting_cpus()                     1
 #define smp_prepare_boot_cpu()                 do {} while (0)
@@ -106,30 +101,25 @@ static inline void smp_send_reschedule(int cpu) { }
 #endif /* !SMP */
 
 /*
- * DEBUG_PREEMPT support: check whether smp_processor_id() is being
- * used in a preemption-safe way.
+ * smp_processor_id(): get the current CPU ID.
  *
- * An architecture has to enable this debugging code explicitly.
- * It can do so by renaming the smp_processor_id() macro to
- * __smp_processor_id().  This should only be done after some minimal
- * testing, because usually there are a number of false positives
- * that an architecture will trigger.
+ * if DEBUG_PREEMPT is enabled the we check whether it is
+ * used in a preemption-safe way. (smp_processor_id() is safe
+ * if it's used in a preemption-off critical section, or in
+ * a thread that is bound to the current CPU.)
  *
- * To fix a false positive (i.e. smp_processor_id() use that the
- * debugging code reports but which use for some reason is legal),
- * change the smp_processor_id() reference to _smp_processor_id(),
- * which is the nondebug variant.  NOTE: don't use this to hack around
- * real bugs.
+ * NOTE: raw_smp_processor_id() is for internal use only
+ * (smp_processor_id() is the preferred variant), but in rare
+ * instances it might also be used to turn off false positives
+ * (i.e. smp_processor_id() use that the debugging code reports but
+ * which use for some reason is legal). Don't use this to hack around
+ * the warning message, as your code might not work under PREEMPT.
  */
-#ifdef __smp_processor_id
-# if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
-   extern unsigned int smp_processor_id(void);
-# else
-#  define smp_processor_id() __smp_processor_id()
-# endif
-# define _smp_processor_id() __smp_processor_id()
+#ifdef CONFIG_DEBUG_PREEMPT
+  extern unsigned int debug_smp_processor_id(void);
+# define smp_processor_id() debug_smp_processor_id()
 #else
-# define _smp_processor_id() smp_processor_id()
+# define smp_processor_id() raw_smp_processor_id()
 #endif
 
 #define get_cpu()              ({ preempt_disable(); smp_processor_id(); })