svn commit: r227539 - head/sys/sparc64/include

[Marius Strobl]

Author: marius
Date: Tue Nov 15 20:17:18 2011
New Revision: 227539
URL: http://svn.freebsd.org/changeset/base/227539

Log:
  Define curthread as an inline function that loads the thread pointer
  directly from g7, the pcpu pointer. This guarantees correct behavior
  when the thread migrates to a different CPU.
  Commit message stolen from r205431. Additional testing by Peter Jeremy.
  
  MFC after:	3 days

Modified:
  head/sys/sparc64/include/pcpu.h

Modified: head/sys/sparc64/include/pcpu.h
==============================================================================
--- head/sys/sparc64/include/pcpu.h	Tue Nov 15 20:15:58 2011	(r227538)
+++ head/sys/sparc64/include/pcpu.h	Tue Nov 15 20:17:18 2011	(r227539)
@@ -74,6 +74,16 @@ register struct pcpu *pcpup __asm__(__XS
 
 #define	PCPU_GET(member)	(pcpup->pc_ ## member)
 
+static __inline __pure2 struct thread *
+__curthread(void)
+{
+	struct thread *td;
+
+	__asm("ldx [%" __XSTRING(PCPU_REG) "], %0" : "=r" (td));
+	return (td);
+}
+#define	curthread	(__curthread())
+
 /*
  * XXX The implementation of this operation should be made atomic
  * with respect to preemption.