[uml-devel] [patch 6/7] uml: commentary about forking flag

[uml-devel] [patch 6/7] uml: commentary about forking flag

[blaisorblade]

Add some commentary about UML internals, for a strange trick.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

 linux-2.6.12-paolo/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
--- linux-2.6.12/include/asm-um/processor-generic.h~uml-commentary-about-forking-flag	2005-04-24 20:17:06.000000000 +0200
+++ linux-2.6.12-paolo/include/asm-um/processor-generic.h	2005-04-24 20:17:06.000000000 +0200
@@ -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;
_


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