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SubjectRe: [PATCH]: exec: avoid propagating PF_NO_SETAFFINITY into userspace child
On 11/27, zhang.yi20@zte.com.cn wrote:
>
> 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>

Thanks!

Acked-by: Oleg Nesterov <oleg@redhat.com>

> --- linux-3.12.old/fs/exec.c 2013-11-26 08:53:12.175811856 +0000
> +++ linux-3.12/fs/exec.c 2013-11-27 09:36:56.231972168 +0000
> @@ -1090,8 +1090,8 @@ int flush_old_exec(struct linux_binprm *
> bprm->mm = NULL; /* We're using it now */
>
> set_fs(USER_DS);
> - current->flags &=
> - ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD | PF_NOFREEZE);
> + current->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD |
> + PF_NOFREEZE | PF_NO_SETAFFINITY);
> flush_thread();
> current->personality &= ~bprm->per_clear;
>
>



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