https://github.com/torvalds/linux
Revision f6c4fd506cb626e4346aa81688f255e593a7c5a0 authored by Thomas Gleixner on 23 December 2017, 18:45:11 UTC, committed by Thomas Gleixner on 23 December 2017, 19:18:42 UTC
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: 92a0f81d8957 ("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>
1 parent 613e396
Raw File
Tip revision: f6c4fd506cb626e4346aa81688f255e593a7c5a0 authored by Thomas Gleixner on 23 December 2017, 18:45:11 UTC
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
Tip revision: f6c4fd5
.gitattributes
*.c   diff=cpp
*.h   diff=cpp
back to top