On Wed, Sep 02, 2020 at 02:45:37PM -0400, Zi Yan wrote: > > Surprised this doesn't touch mm/pagewalk.c ? > > 1GB PUD page support is present for DAX purpose, so the code is there > in mm/pagewalk.c already. I only needed to supply ops->pud_entry when using > the functions in mm/pagewalk.c. :)
Yes, but doesn't this change what is possible under the mmap_sem without the page table locks? ie I would expect some thing like pmd_trans_unstable() to be required as well for lockless walkers. (and I don't think the pmd code is 100% right either) Jason
