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 <dan.j.williams@xxxxxxxxx>
>Cc: Borislav Petkov <bp@xxxxxxx>
>Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>Cc: Ingo Molnar <mingo@xxxxxxxxxx>
>Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
>Cc: Nadav Amit <namit@xxxxxxxxxx>
>Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
>Cc: Oscar Salvador <osalvador@xxxxxxx>
>Acked-by: Michal Hocko <mhocko@xxxxxxxx>
>Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
>---
> 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
