From: Paolo 'Blaisorblade' Giarrusso Add some commentary about UML internals, for a strange trick. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton --- 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; _