On Wed, 19 Aug 2020 10:30:25 -0700 Florian Fainelli <f.fainelli@xxxxxxxxx> wrote: > On 8/19/20 10:22 AM, Andrew Morton wrote: > > On Wed, 19 Aug 2020 10:15:53 -0700 Florian Fainelli <f.fainelli@xxxxxxxxx> wrote: > > > >>>> In many cases the difference is not significant, but for example > >>>> an ARM platform with 1GB of memory and the following memory layout > >>>> [ 0.000000] cma: Reserved 256 MiB at 0x0000000030000000 > >>>> [ 0.000000] Zone ranges: > >>>> [ 0.000000] DMA [mem 0x0000000000000000-0x000000002fffffff] > >>>> [ 0.000000] Normal empty > >>>> [ 0.000000] HighMem [mem 0x0000000030000000-0x000000003fffffff] > >>>> > >>>> would result in 0 lowmem_reserve for the DMA zone. This would allow > >>>> userspace to deplete the DMA zone easily. > >>> > >>> Sounds fairly serious for thos machines. Was a cc:stable considered? > >> > >> Since there is a Fixes: tag, it may have been assumed that the patch > >> would be picked up and as soon as it reaches Linus' tree it would be > >> picked up by the stable selection. > > > > It doesn't work that way - sometimes a fix isn't considered important > > enough to backport. It could just fix a typo in a comment! > > Then can this be applied ASAP and back ported? Sure.
