[PATCH 1/2] x86/mm/numa: Clean up topology parsing in amd_numa_init()

[Thorsten Blum]

Since commit e23bba604433 ("x86-64, NUMA: Unify emulated distance
mapping"), nodeids[] is only written but never read. Remove it.

Also drop the start variable and the base < start clamp, since start is
always zero and the expression always false.

While at it, use min() for the limit > end clamp and drop the redundant
second limit > end clamp.

Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxx>
---
 arch/x86/mm/amdtopology.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/arch/x86/mm/amdtopology.c b/arch/x86/mm/amdtopology.c
index f980b0eb0105..d68d345a5b82 100644
--- a/arch/x86/mm/amdtopology.c
+++ b/arch/x86/mm/amdtopology.c
@@ -27,8 +27,6 @@
 #include <asm/apic.h>
 #include <asm/amd/nb.h>
 
-static unsigned char __initdata nodeids[8];
-
 static __init int find_northbridge(void)
 {
 	int num;
@@ -56,7 +54,7 @@ static __init int find_northbridge(void)
 int __init amd_numa_init(void)
 {
 	unsigned int numnodes, cores, apicid;
-	u64 prevbase, start = PFN_PHYS(0);
+	u64 prevbase;
 	u64 end = PFN_PHYS(max_pfn);
 	u32 nodeid, reg;
 	int i, j, nb;
@@ -84,7 +82,7 @@ int __init amd_numa_init(void)
 		base = read_pci_config(0, nb, 1, 0x40 + i*8);
 		limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 
-		nodeids[i] = nodeid = limit & 7;
+		nodeid = limit & 7;
 		if ((base & 3) == 0) {
 			if (i < numnodes)
 				pr_info("Skipping disabled node %d\n", i);
@@ -115,19 +113,12 @@ int __init amd_numa_init(void)
 		limit >>= 16;
 		limit++;
 		limit <<= 24;
-
-		if (limit > end)
-			limit = end;
+		limit = min(limit, end);
 		if (limit <= base)
 			continue;
 
 		base >>= 16;
 		base <<= 24;
-
-		if (base < start)
-			base = start;
-		if (limit > end)
-			limit = end;
 		if (limit == base) {
 			pr_err("Empty node %d\n", nodeid);
 			continue;