On Wed, Jun 12, 2019 at 3:23 PM Baoquan He <bhe@xxxxxxxxxx> wrote: [...] > > > I have applied the patch set from [0] and booted into the new kernel. > > > > > > But I have set... > > > > > > CONFIG_PGTABLE_LEVELS=4 > > > # CONFIG_X86_5LEVEL is not set > > > > > > To test this I need CONFIG_X86_5LEVEL=y? > > > Best two kernels with and without your patch. > > > > Yeah, with CONFIG_X86_5LEVEL=y. > > > > In fact I didn't have chance to trigger the issue to reproduce, then > > apply this patch to fix. As you know, the machine with large memory is > > too few. This is a code bug, so I just run the level 4 kernel and level > > 5 kernel to test the basic functionality. > > > > If you have machine owning RAM 64 TB, and it supports 5-level, you can > ~~~~ > Here, I meant owning RAM larger than 64 TB > > > build two kernels w and w/o this patch, it's easy to reproduce. > > Hi Baoquan, No, I have no 64-TB-machine here. I have seen that the Kconfig help text [0] says... See Documentation/x86/x86_64/5level-paging.txt for more information. That should be s/5level-paging.txt/5level-paging.rst. I can send a patch if you like. Can you look at the text of [1] - are the informations up2date? Thanks. Regards, - Sedat - [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/Kconfig#n1481 [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/x86/x86_64/5level-paging.rst > > > > > > - Sedat - > > > > > > [0] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=00e5a2bbcc31d5fea853f8daeba0f06c1c88c3ff > > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/x86/x86_64/5level-paging.rst
