On Thu, Apr 30, 2020 at 01:38:40PM -0700, ira.weiny@xxxxxxxxx wrote: > From: Ira Weiny <ira.weiny@xxxxxxxxx> > > Every arch has the same code to ensure atomic operations and a check for > !HIGHMEM page. > > Remove the duplicate code by defining a core kmap_atomic() which only > calls the arch specific kmap_atomic_high() when the page is high memory. Err.... AFAICS, you've just silently changed the semantics for kmap_atomic_prot() here. And while most of the callers are converted, drivers/gpu/drm/ttm/ttm_bo_util.c one is not, so at the very least it's a bisect hazard... And I would argue that having kmap_atomic() differ from kmap_atomic_prot() wrt disabling preempt is asking for trouble.
