From acef2e55d2a1b59bb5610cacc546c1d1b5de2dc9 Mon Sep 17 00:00:00 2001
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Date: Sun, 1 May 2005 08:58:56 -0700
Subject: [PATCH] [PATCH] uml: commentary about forking flag
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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
include/asm-um/processor-generic.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index 4d9404989b5a..b953b1ad3b02 100644
--- a/include/asm-um/processor-generic.h
+++ b/include/asm-um/processor-generic.h
@@ -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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