stop_machine: Add stop_core_cpuslocked() for per-core operations

mainline inclusion
from mainline-v5.19-rc1
commit 2760f5a4
category: feature
feature: Intel In Filed Scan(IFS)
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I651S7
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/


commit/?id=2760f5a4

Intel-SIG: commit 2760f5a4 ("stop_machine: Add stop_core_cpuslocked() for per-core operations")

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stop_machine: Add stop_core_cpuslocked() for per-core operations

Hardware core level testing features require near simultaneous execution
of WRMSR instructions on all threads of a core to initiate a test.

Provide a customized cut down version of stop_machine_cpuslocked() that
just operates on the threads of a single core.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220506225410.1652287-4-tony.luck@intel.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Aichun Shi <aichun.shi@intel.com>