[LTP] [PATCH] max_map_count: Fails due to negative memfree value

[madhura <madhura@linux.vnet.ibm.com>]

In situations when memory is occupied to a certain higher limit by system processes, the amount of memory available may be in negative/low values not suitable for testing.
Hence its better to have a memory check prior to the test beginning.

Signed-off-by: Madhura P S <madhura@linux.vnet.ibm.com>

--- ltp-full-20130109/testcases/kernel/mem/tunable/max_map_count.c.org	2013-01-17 17:15:38.957032558 +0530
+++ ltp-full-20130109/testcases/kernel/mem/tunable/max_map_count.c	2013-01-17 17:16:58.092909326 +0530
@@ -152,7 +152,7 @@ static void max_map_count_test(void)
  	pid_t pid;
  	long max_maps;
  	long map_count;
-	long max_iters;
+	long max_iters = 0;
  	long memfree;
  
  	/*
@@ -174,7 +174,8 @@ static void max_map_count_test(void)
  	 */
  	memfree = read_meminfo("CommitLimit:") - read_meminfo("Committed_AS:");
  	/* 64 used as a bias to make sure no overflow happen */
-	max_iters = memfree / sysconf(_SC_PAGESIZE) * 1024 - 64;
+	if (memfree > 0)
+		max_iters = memfree / sysconf(_SC_PAGESIZE) * 1024 - 64;
  	if (max_iters > MAX_MAP_COUNT)
  		max_iters = MAX_MAP_COUNT;




-- 
With Regards,
Madhura P S


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