[PATCH v6 01/27] x86, mm: Fix page table early allocation offset checking

[Yinghai Lu]

During debug load kernel above 4G, found one page if is not used in BRK
and it should be with early page allocation.

Fix that checking and also add print out for every allocation from BRK
page table allocation.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 arch/x86/mm/init.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 6f85de8..c4293cf 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -47,7 +47,7 @@ __ref void *alloc_low_pages(unsigned int num)
 						__GFP_ZERO, order);
 	}
 
-	if ((pgt_buf_end + num) >= pgt_buf_top) {
+	if ((pgt_buf_end + num) > pgt_buf_top) {
 		unsigned long ret;
 		if (min_pfn_mapped >= max_pfn_mapped)
 			panic("alloc_low_page: ran out of memory");
@@ -61,6 +61,8 @@ __ref void *alloc_low_pages(unsigned int num)
 	} else {
 		pfn = pgt_buf_end;
 		pgt_buf_end += num;
+		printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n",
+			pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1);
 	}
 
 	for (i = 0; i < num; i++) {
-- 
1.7.10.4

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