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Subject[PATCH 2/3] x86: don't need to go to chunksize to 4G
Date
change back chunksize max to 2g
otherwise will get strange layout in 2G ram system like
0 - 4g WB, 2040M - 2048M UC, 2048M - 4G NC
instead of
0 - 2g WB, 2040M - 2048M UC

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

---
arch/x86/kernel/cpu/mtrr/main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
Index: linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/main.c
+++ linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
@@ -1162,10 +1162,10 @@ struct mtrr_cleanup_result {

/*
* gran_size: 1M, 2M, ..., 2G
- * chunk size: gran_size, ..., 4G
- * so we need (2+13)*6
+ * chunk size: gran_size, ..., 2G
+ * so we need (1+12)*6
*/
-#define NUM_RESULT 90
+#define NUM_RESULT 78
#define PSHIFT (PAGE_SHIFT - 10)

static struct mtrr_cleanup_result __initdata result[NUM_RESULT];
@@ -1282,7 +1282,7 @@ static int __init mtrr_cleanup(unsigned
memset(min_loss_pfn, 0xff, sizeof(min_loss_pfn));
memset(result, 0, sizeof(result));
for (gran_size = (1ULL<<20); gran_size < (1ULL<<32); gran_size <<= 1) {
- for (chunk_size = gran_size; chunk_size < (1ULL<<33);
+ for (chunk_size = gran_size; chunk_size < (1ULL<<32);
chunk_size <<= 1) {
int num_reg;


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