x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
The loop which populates the CPU entry area PMDs can wrap around on 32bit machines when the number of CPUs is small. It worked wonderful for NR_CPUS=64 for whatever reason and the moron who wrote that code did not bother to test it with !SMP. Check for the wraparound to fix it. Fixes: 92a0f81d ("x86/cpu_entry_area: Move it out of the fixmap") Reported-by:kernel test robot <fengguang.wu@intel.com> Signed-off-by:
Thomas "Feels stupid" Gleixner <tglx@linutronix.de> Tested-by:
Borislav Petkov <bp@alien8.de>
parent
613e396b
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