On Thu, Sep 22, 2022 at 11:01 PM Mike Travis <mike.travis@xxxxxxx> wrote: > > To avoid a "BUG: using smp_processor_id() in preemptible" debug warning > message, disable preemption around use of the processor id. This code > sequence merely decides which portal that this CPU uses to read the RTC. > It does this to avoid thrashing the cache but even if preempted it still > reads the same time from the single RTC clock. ... > Signed-off-by: Mike Travis <mike.travis@xxxxxxx> > Reviewed-by: Steve Wahl <steve.wahl@xxxxxxx> > Reviewed-by: Dimitri Sivanich <dimitri.sivanich@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx No kernel version? No Fixes tag? ... > - offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; > + offset = (uv_cpu_blade_processor_id(cpu) * L1_CACHE_BYTES) % PAGE_SIZE; Perhaps it can be transformed to use offset_in_page() at the same time. -- With Best Regards, Andy Shevchenko
