Commit b88fae64 authored Jan 23, 2014 by Zhang Yi Committed by Linus Torvalds Jan 23, 2014

exec: avoid propagating PF_NO_SETAFFINITY into userspace child



Userspace process doesn't want the PF_NO_SETAFFINITY, but its parent may be
a kernel worker thread which has PF_NO_SETAFFINITY set, and this worker thread
can do kernel_thread() to create the child.
Clearing this flag in usersapce child to enable its migrating capability.

Signed-off-by: Zhang Yi <zhang.yi20@zte.com.cn>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 8d38f203

fs/exec.c

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1087,8 +1087,8 @@ int flush_old_exec(struct linux_binprm * bprm)
	bprm->mm = NULL; /* We're using it now */		bprm->mm = NULL; /* We're using it now */

	set_fs(USER_DS);		set_fs(USER_DS);
	current->flags &=		current->flags &= ~(PF_RANDOMIZE \| PF_FORKNOEXEC \| PF_KTHREAD \|
	~(PF_RANDOMIZE \| PF_FORKNOEXEC \| PF_KTHREAD \| PF_NOFREEZE);		PF_NOFREEZE \| PF_NO_SETAFFINITY);
	flush_thread();		flush_thread();
	current->personality &= ~bprm->per_clear;		current->personality &= ~bprm->per_clear;

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