From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Date: Sun, 1 May 2005 15:58:56 +0000 (-0700)
Subject: [PATCH] uml: commentary about forking flag
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=acef2e55d2a1b59bb5610cacc546c1d1b5de2dc9;p=openwrt%2Fstaging%2Fblogic.git

[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>
---

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;