APPLIED: [SRU][M][PATCH 0/2] Fix proc_sched_rt01 issue in LTP

[Roxana Nicolescu]

On 10/04/2024 13:29, Guoqing Jiang wrote:
> SRU justification
>
> BugLink: https://bugs.launchpad.net/bugs/2057734
>
> [Impact]
> The updated LTP has added proc_sched_rt01 testcase which can't pass
> since several commits are missed from kernel side.
>
> Test log:
> INFO: Test start time: Tue Mar 12 11:52:21 UTC 2024
> COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 163430 -n 163430 -f /tmp/ltp-X3Nz2HWCQe/alltests -l /dev/null -C /dev/null -T /dev/null
> LOG File: /dev/null
> FAILED COMMAND File: /dev/null
> TCONF COMMAND File: /dev/null
> Running tests.......
> tst_kconfig.c:87: TINFO: Parsing kernel config '/lib/modules/6.5.0-27-generic/build/.config'
> tst_test.c:1741: TINFO: LTP version: 20230929-406-gcbc2d0568
> tst_test.c:1625: TINFO: Timeout per run is 0h 00m 30s
> proc_sched_rt01.c:45: TFAIL: Expect: timeslice_ms > 0 after reset to default
> proc_sched_rt01.c:51: TPASS: echo 0 > /proc/sys/kernel/sched_rt_period_us : EINVAL (22)
> proc_sched_rt01.c:53: TFAIL: echo -1 > /proc/sys/kernel/sched_rt_period_us invalid retval 2: SUCCESS (0)
> proc_sched_rt01.c:59: TPASS: echo -2 > /proc/sys/kernel/sched_rt_runtime_us : EINVAL (22)
> proc_sched_rt01.c:72: TFAIL: echo rt_period_us+1 > /proc/sys/kernel/sched_rt_runtime_us invalid retval 1: SUCCESS (0)
>
> HINT: You _MAY_ be missing kernel fixes:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1fc6484e1fb
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=079be8fc6309
>
> [Fix]
> There are 3 relevant commits from upstream.
>
> 1. 079be8fc6309 sched/rt: Disallow writing invalid values to sched_rt_period_us
> 2. c1fc6484e1fb sched/rt: sysctl_sched_rr_timeslice show default timeslice after reset
> 3. c7fcb99877f9 sched/rt: Fix sysctl_sched_rr_timeslice intial value
>
> Mantic: the 3rd is already in master-next.
> Jammy: stable v5.15.150 includes the three commits.
> Focal: master-next has include them after update to v5.4.270
>
> [Test case]
> Run LTP update 20240312 to check the log of proc_sched_rt01.
>
> [Regression potential]
> Low risk since these content are existed in upstream for a while.
>
> Cyril Hrubis (2):
>    sched/rt: sysctl_sched_rr_timeslice show default timeslice after reset
>    sched/rt: Disallow writing invalid values to sched_rt_period_us
>
>   kernel/sched/rt.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)
>
Applied to mantic master-next branch. Thanks!