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| author | Valentin Schneider <valentin.schneider@arm.com> | 2021-07-07 19:38:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-14 17:07:52 +0200 |
| commit | 20a015e948b825afb47855de2efce7cae7c2608f (patch) | |
| tree | 6aa150ed678267d0592afc6f17546dff56a7c8f0 /drivers | |
| parent | 51189a3c6e5417491382e7c5b58d9ff126c2e193 (diff) | |
powerpc/preempt: Don't touch the idle task's preempt_count during hotplug
commit 2c669ef6979c370f98d4b876e54f19613c81e075 upstream.
Powerpc currently resets a CPU's idle task preempt_count to 0 before
said task starts executing the secondary startup routine (and becomes an
idle task proper).
This conflicts with commit f1a0a376ca0c ("sched/core: Initialize the
idle task with preemption disabled").
which initializes all of the idle tasks' preempt_count to
PREEMPT_DISABLED during smp_init(). Note that this was superfluous
before said commit, as back then the hotplug machinery would invoke
init_idle() via idle_thread_get(), which would have already reset the
CPU's idle task's preempt_count to PREEMPT_ENABLED.
Get rid of this preempt_count write.
Fixes: f1a0a376ca0c ("sched/core: Initialize the idle task with preemption disabled")
Reported-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210707183831.2106509-1-valentin.schneider@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions