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>

diff --git a/arch/powerpc/platforms/cell/smp.c b/arch/powerpc/platforms/cell/smp.c
index c855a0a..d7ab868 100644 (file)
--- a/arch/powerpc/platforms/cell/smp.c
+++ b/arch/powerpc/platforms/cell/smp.c
@@ -78,9 +78,6 @@ static inline int smp_startup_cpu(unsigned int lcpu)
 
        pcpu = get_hard_smp_processor_id(lcpu);
 
-       /* Fixup atomic count: it exited inside IRQ handler. */
-       task_thread_info(paca_ptrs[lcpu]->__current)->preempt_count     = 0;
-
        /*
         * If the RTAS start-cpu token does not exist then presume the
         * cpu is already spinning.

diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 9292249..624e80b 100644 (file)
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -104,9 +104,6 @@ static inline int smp_startup_cpu(unsigned int lcpu)
                return 1;
        }
 
-       /* Fixup atomic count: it exited inside IRQ handler. */
-       task_thread_info(paca_ptrs[lcpu]->__current)->preempt_count     = 0;
-
        /* 
         * If the RTAS start-cpu token does not exist then presume the
         * cpu is already spinning.