This is a note to let you know that I've just added the patch titled s390/vtime: fix increased steal time accounting to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: s390-vtime-fix-increased-steal-time-accounting.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d54cb7d54877d529bc1e0e1f47a3dd082f73add3 Mon Sep 17 00:00:00 2001 From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx> Date: Wed, 10 Mar 2021 14:23:37 +0100 Subject: s390/vtime: fix increased steal time accounting From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx> commit d54cb7d54877d529bc1e0e1f47a3dd082f73add3 upstream. Commit 152e9b8676c6e ("s390/vtime: steal time exponential moving average") inadvertently changed the input value for account_steal_time() from "cputime_to_nsecs(steal)" to just "steal", resulting in broken increased steal time accounting. Fix this by changing it back to "cputime_to_nsecs(steal)". Fixes: 152e9b8676c6e ("s390/vtime: steal time exponential moving average") Cc: <stable@xxxxxxxxxxxxxxx> # 5.1 Reported-by: Sabine Forkel <sabine.forkel@xxxxxxxxxx> Reviewed-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/s390/kernel/vtime.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -217,7 +217,7 @@ void vtime_flush(struct task_struct *tsk avg_steal = S390_lowcore.avg_steal_timer / 2; if ((s64) steal > 0) { S390_lowcore.steal_timer = 0; - account_steal_time(steal); + account_steal_time(cputime_to_nsecs(steal)); avg_steal += steal; } S390_lowcore.avg_steal_timer = avg_steal; Patches currently in stable-queue which might be from gerald.schaefer@xxxxxxxxxxxxx are queue-5.4/s390-vtime-fix-increased-steal-time-accounting.patch