X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fhardirq.h;h=181006cc94a03ecd29630d80d91762589fc1c316;hb=f1b134fdf6d36c975b4a66cf952565cd73aebdba;hp=49829988bfa02cb85a02e38db87f81d077261060;hpb=577f99c1d08cf9cbdafd4e858dd13ff04d855090;p=linux-2.6

diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index 49829988bf..181006cc94 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -72,17 +72,26 @@
 #define in_softirq()		(softirq_count())
 #define in_interrupt()		(irq_count())
 
-#define in_atomic()		((preempt_count() & ~PREEMPT_ACTIVE) != 0)
-
-#ifdef CONFIG_PREEMPT
+#if defined(CONFIG_PREEMPT)
+# define PREEMPT_INATOMIC_BASE kernel_locked()
 # define PREEMPT_CHECK_OFFSET 1
 #else
+# define PREEMPT_INATOMIC_BASE 0
 # define PREEMPT_CHECK_OFFSET 0
 #endif
 
+/*
+ * Are we running in atomic context?  WARNING: this macro cannot
+ * always detect atomic context; in particular, it cannot know about
+ * held spinlocks in non-preemptible kernels.  Thus it should not be
+ * used in the general case to determine whether sleeping is possible.
+ * Do not use in_atomic() in driver code.
+ */
+#define in_atomic()	((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_INATOMIC_BASE)
+
 /*
  * Check whether we were atomic before we did preempt_disable():
- * (used by the scheduler)
+ * (used by the scheduler, *after* releasing the kernel lock)
  */
 #define in_atomic_preempt_off() \
 		((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET)