On 03/16/2017 09:07 AM, Dan Williams wrote: > Historically kasan has not been careful about whether vmemmap_populate() > internally allocates a section worth of memmap even if the parameters > call for less. For example, a request to shadow map a single page > results in a full section (128MB) that contains that page being mapped. > Also, kasan has not been careful to handle cases where this section > promotion causes overlaps / overrides of previous calls to > vmemmap_populate(). > > Before we teach vmemmap_populate() to support sub-section hotplug, > arrange for kasan to explicitly avoid vmemmap_populate_basepages(). > This should be functionally equivalent to the current state since > CONFIG_KASAN requires x86_64 (implies PSE) and it does not collide with > sub-section hotplug support since CONFIG_KASAN disables > CONFIG_MEMORY_HOTPLUG. > > Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Cc: Alexander Potapenko <glider@xxxxxxxxxx> > Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> > Reported-by: Nicolai Stange <nicstange@xxxxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Acked-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
