KSM test case fixes - mmap10

If the option for (-s) is selected then checking whether ksm related directory exists in sysfs or not.

mmap10_2:
Before patch:
...

mmap10      0  TINFO  :  add to KSM regions.
mmap10      0  TINFO  :  use /dev/zero.
mmap10      0  TINFO  :  start tests.
mmap10      1  TBROK  :  madvise: errno=EINVAL(22): Invalid argument
mmap10      2  TBROK  :  Remaining cases broken

...

After patch:
...

mmap10      1  TCONF  :  KSM configuration is not enabled
mmap10      2  TCONF  :  Remaining cases not appropriate for configuration

...

mmap10_3, mmap10_4, mmap10_5:
Before patch:
...

mmap10      0  TINFO  :  add to KSM regions.
mmap10      0  TINFO  :  use anonymous pages.
mmap10      0  TINFO  :  start tests.
mmap10      1  TBROK  :  madvise: errno=EINVAL(22): Invalid argument
mmap10      2  TBROK  :  Remaining cases broken

...

After patch:
...

mmap10      1  TCONF  :  KSM configuration is not enabled
mmap10      2  TCONF  :  Remaining cases not appropriate for configuration

...

Regards
R.Nageswara Sastry

@@ -94,6 +94,11 @@ int main(int argc, char *argv[])
 
 	if (opt_ksm)
 	{
+                char *fname = "/sys/kernel/mm/ksm/";
+
+                if( access( fname, F_OK ) == -1 ) {
+                        tst_brkm(TCONF, NULL, "KSM configuration is not enabled");
+                }
 #ifdef HAVE_MADV_MERGEABLE
 		tst_resm(TINFO, "add to KSM regions.");
 #else

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