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Subject[PATCH 41/46] x86, mm: Use clamp_t() in init_range_memory_mapping
Date
save some lines, and make code more readable.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/init.c | 21 +++++----------------
1 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 028a129..3c48114 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -354,31 +354,20 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
* this one could take range with hole in it.
*/
static unsigned long __init init_range_memory_mapping(
- unsigned long range_start,
- unsigned long range_end)
+ unsigned long r_start,
+ unsigned long r_end)
{
unsigned long start_pfn, end_pfn;
unsigned long mapped_ram_size = 0;
int i;

for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
- u64 start = (u64)start_pfn << PAGE_SHIFT;
- u64 end = (u64)end_pfn << PAGE_SHIFT;
-
- if (end <= range_start)
- continue;
-
- if (start < range_start)
- start = range_start;
-
- if (start >= range_end)
+ u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);
+ u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end);
+ if (start >= end)
continue;

- if (end > range_end)
- end = range_end;
-
init_memory_mapping(start, end);
-
mapped_ram_size += end - start;
}

--
1.7.7


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