Fix kevent's childs priority greediness

Fix kevent's childs priority greediness.  Such tasks were always scheduled
at nice level -5 and, at that time, udev stole us the CPU time with -5.

Already posted at http://lkml.org/lkml/2005/1/10/85

[akpm@linux-foundation.org: add comment]
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 11c584cd16b3..49cc4b9c1a8d 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -165,6 +165,12 @@ static int ____call_usermodehelper(void *data)
         /* We can run anywhere, unlike our parent keventd(). */
         set_cpus_allowed(current, CPU_MASK_ALL);
 
+        /*
+         * Our parent is keventd, which runs with elevated scheduling priority.
+         * Avoid propagating that into the userspace child.
+         */
+        set_user_nice(current, 0);
+
         retval = -EPERM;
         if (current->fs->root)
                 retval = kernel_execve(sub_info->path,