diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2022-10-14 01:16:46 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-10-18 22:46:18 +1100 |
| commit | 2b2095f3a6b43ec36ff890febc588df1ec32e826 (patch) | |
| tree | 5877fa74e049f53989a8092a507a2f8716827447 /arch/powerpc/lib/vmx-helper.c | |
| parent | b9ef323ea1682f9837bf63ba10c5e3750f71a20a (diff) | |
powerpc/64s: Fix hash__change_memory_range preemption warning
stop_machine_cpuslocked takes a mutex so it must be called in a
preemptible context, so it can't simply be fixed by disabling
preemption.
This is not a bug, because CPU hotplug is locked, so this processor will
call in to the stop machine function. So raw_smp_processor_id() could be
used. This leaves a small chance that this thread will be migrated to
another CPU, so the master work would be done by a CPU from a different
context. Better for test coverage to make that a common case by just
having the first CPU to call in become the master.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221013151647.1857994-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/lib/vmx-helper.c')
0 files changed, 0 insertions, 0 deletions