On Wed, Aug 14, 2019 at 05:41:05PM +0200, David Hildenbrand wrote: >This makes it clearer that we will never call func() with duplicate PFNs >in case we have multiple sub-page memory resources. All unaligned parts >of PFNs are completely discarded. > >Cc: Dan Williams <[email protected]> >Cc: Borislav Petkov <[email protected]> >Cc: Andrew Morton <[email protected]> >Cc: Bjorn Helgaas <[email protected]> >Cc: Ingo Molnar <[email protected]> >Cc: Dave Hansen <[email protected]> >Cc: Nadav Amit <[email protected]> >Cc: Wei Yang <[email protected]> >Cc: Oscar Salvador <[email protected]> >Acked-by: Michal Hocko <[email protected]> >Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Wei Yang <[email protected]> >--- > kernel/resource.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > >diff --git a/kernel/resource.c b/kernel/resource.c >index 7ea4306503c5..88ee39fa9103 100644 >--- a/kernel/resource.c >+++ b/kernel/resource.c >@@ -487,8 +487,8 @@ int walk_system_ram_range(unsigned long start_pfn, >unsigned long nr_pages, > while (start < end && > !find_next_iomem_res(start, end, flags, IORES_DESC_NONE, > false, &res)) { >- pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; >- end_pfn = (res.end + 1) >> PAGE_SHIFT; >+ pfn = PFN_UP(res.start); >+ end_pfn = PFN_DOWN(res.end + 1); > if (end_pfn > pfn) > ret = (*func)(pfn, end_pfn - pfn, arg); > if (ret) >-- >2.21.0 -- Wei Yang Help you, Help me
