On Tue, Jan 16, 2018 at 02:51:45PM -0800, Andy Lutomirski wrote: > On Tue, Jan 16, 2018 at 8:52 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > On Tue, Jan 16, 2018 at 05:36:49PM +0100, Joerg Roedel wrote: > >> From: Joerg Roedel <jroedel@xxxxxxx> > >> > >> Reserve 2MB/4MB of address space for mapping the LDT to > >> user-space. > > > > LDT is 64k, we need 2 per CPU, and NR_CPUS <= 64 on 32bit, that gives > > 64K*2*64=8M > 2M. > > If this works like it does on 64-bit, it only needs 128k regardless of > the number of CPUs. The LDT mapping is specific to the mm. Ah, then I got my LDT things confused again... which is certainly possible, we had a few too many variants back then. -- 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>
