* [patch 6/7] uml: commentary about forking flag
@ 2005-04-24 18:19 blaisorblade
0 siblings, 0 replies; only message in thread
From: blaisorblade @ 2005-04-24 18:19 UTC (permalink / raw)
To: akpm; +Cc: jdike, bstroesser, linux-kernel, user-mode-linux-devel, 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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