From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Add some commentary about UML internals, for a strange trick.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
include/asm-um/processor-generic.h | 4 ++++
1 files changed, 4 insertions(+)
diff -puN include/asm-um/processor-generic.h~uml-commentary-about-forking-flag include/asm-um/processor-generic.h
--- 25/include/asm-um/processor-generic.h~uml-commentary-about-forking-flag 2005-04-26 04:25:29.094794240 -0700
+++ 25-akpm/include/asm-um/processor-generic.h 2005-04-26 04:25:29.097793784 -0700
@@ -17,6 +17,10 @@ struct task_struct;
struct mm_struct;
struct thread_struct {
+ /* This flag is set to 1 before calling do_fork (and analyzed in
+ * copy_thread) to mark that we are begin called from userspace (fork /
+ * vfork / clone), and reset to 0 after. It is left to 0 when called
+ * from kernelspace (i.e. kernel_thread() or fork_idle(), as of 2.6.11). */
int forking;
int nsyscalls;
struct pt_regs regs;
_