arm: mm: use __pfn_to_section() to get mem_section

Replace the open-coded '__nr_to_section(pfn_to_section_nr(pfn))' in
pfn_valid() with a more concise call to '__pfn_to_section(pfn)'.

No functional change.

Signed-off-by: Guixiong Wei <guixiongwei@gmail.com>
Link: https://lore.kernel.org/r/20200430161858.11379-1-guixiongwei@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index e42727e..d2df416 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -272,7 +272,7 @@ int pfn_valid(unsigned long pfn)
        if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
                return 0;
 
-       if (!valid_section(__nr_to_section(pfn_to_section_nr(pfn))))
+       if (!valid_section(__pfn_to_section(pfn)))
                return 0;
 #endif
        return memblock_is_map_memory(addr);