1 files changed, 19 insertions, 10 deletions

diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 6567439fe78..bcdcf0ccc8d 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -229,8 +229,9 @@ static void cmm_get_mpp(void)
 {
         int rc;
         struct hvcall_mpp_data mpp_data;
-        unsigned long active_pages_target;
-        signed long page_loan_request;
+        signed long active_pages_target, page_loan_request, target;
+        signed long total_pages = totalram_pages + loaned_pages;
+        signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE;
 
         rc = h_get_mpp(&mpp_data);
 
@@ -238,17 +239,25 @@ static void cmm_get_mpp(void)
                 return;
 
         page_loan_request = div_s64((s64)mpp_data.loan_request, PAGE_SIZE);
-        loaned_pages_target = page_loan_request + loaned_pages;
-        if (loaned_pages_target > oom_freed_pages)
-                loaned_pages_target -= oom_freed_pages;
+        target = page_loan_request + (signed long)loaned_pages;
+
+        if (target < 0 || total_pages < min_mem_pages)
+                target = 0;
+
+        if (target > oom_freed_pages)
+                target -= oom_freed_pages;
         else
-                loaned_pages_target = 0;
+                target = 0;
+
+        active_pages_target = total_pages - target;
+
+        if (min_mem_pages > active_pages_target)
+                target = total_pages - min_mem_pages;
 
-        active_pages_target = totalram_pages + loaned_pages - loaned_pages_target;
+        if (target < 0)
+                target = 0;
 
-        if ((min_mem_mb * 1024 * 1024) > (active_pages_target * PAGE_SIZE))
-                loaned_pages_target = totalram_pages + loaned_pages -
-                        ((min_mem_mb * 1024 * 1024) / PAGE_SIZE);
+        loaned_pages_target = target;
 
         cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n",
                 page_loan_request, loaned_pages, loaned_pages_target,