linux-kernel - kmod: avoid propagating PF_NO_SETAFFINITY into userspace child

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Message-ID: <OFC3933D9B.5510E97E-ON48257C23.0007B7CD-48257C23.000A4246@zte.com.cn>
Date:	Thu, 14 Nov 2013 09:51:47 +0800
From:	zhang.yi20@....com.cn
To:	linux-kernel@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Oleg Nesterov <oleg@...hat.com>
Subject: kmod: avoid propagating PF_NO_SETAFFINITY into userspace child


The kernel worker thread has the PF_NO_SETAFFINITY flag, and it is propagated
into the userspace child. Clearing this flag in usersapce child to enable its
migrating capability.


Signed-off-by: Zhang Yi <zhang.yi20@....com.cn>

--- linux3-12/kernel/kmod.c	2013-11-14 09:06:58.991781656 +0000
+++ linux3-12/kernel/kmod.c	2013-11-14 09:08:47.511781621 +0000
@@ -217,6 +217,7 @@ static int ____call_usermodehelper(void
 	 * Avoid propagating that into the userspace child.
 	 */
 	set_user_nice(current, 0);
+	current->flags &= ~PF_NO_SETAFFINITY;

 	retval = -ENOMEM;
 	new = prepare_kernel_cred(current);

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