linux-kernel - [PATCH 2/6] UML: Don't valgrind userspace

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Date:	Fri, 29 Aug 2008 16:15:24 -0700 (PDT)
From:	Steve VanDeBogart <vandebo-lkml@...dBox.Net>
To:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, jiayingz@...gle.com,
	dkegel@...gle.com
Subject: [PATCH 2/6] UML: Don't valgrind userspace

Add a flag to tell Valgrind to run the forked child natively.  Necessary
because Valgrind makes additional system calls to instrumented processes,
which confuse UML.

Signed-off-by: Steve VanDeBogart <vandebo-lkml@...dbox.net>
---

Index: linux-2.6.27-rc5/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.27-rc5.orig/arch/um/os-Linux/skas/process.c	2008-08-29 15:50:24.000000000 -0700
+++ linux-2.6.27-rc5/arch/um/os-Linux/skas/process.c	2008-08-29 15:51:45.000000000 -0700
@@ -26,6 +26,7 @@
  #include "skas_ptrace.h"
  #include "user.h"
  #include "sysdep/stub.h"
+#include "valgrind.h"

  int is_skas_winch(int pid, int fd, void *data)
  {
@@ -297,8 +298,12 @@
  	flags = CLONE_FILES;
  	if (proc_mm)
  		flags |= CLONE_VM;
-	else
+	else {
  		flags |= SIGCHLD;
+#ifdef UML_CONFIG_VALGRIND_SUPPORT
+		flags |= VALGRIND_CLONE_LETGO;
+#endif
+	}

  	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
  	if (pid < 0) {
--
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