[LTP] [PATCH v5 1/4] swapping01: skip test if zram-swap is being used

[Yang Xu]

For the swapping test we attempt to allocate 130% of the available RAM and
we make sure that the overflow would fit the swap, but as long as swap is
backed by RAM this obviously false. So skip it if zram-swap is being used.

Also make check happy.

Fixes: #888
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 testcases/kernel/mem/swapping/swapping01.c | 25 ++++++++++++++++------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/testcases/kernel/mem/swapping/swapping01.c b/testcases/kernel/mem/swapping/swapping01.c
index 392b79d65..498f502c1 100644
--- a/testcases/kernel/mem/swapping/swapping01.c
+++ b/testcases/kernel/mem/swapping/swapping01.c
@@ -40,10 +40,10 @@
 
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include "tst_safe_stdio.h"
 #include "lapi/abisize.h"
 #include "mem.h"
 
@@ -67,16 +67,27 @@ static void test_swapping(void)
 #ifdef TST_ABI32
 	tst_brk(TCONF, "test is not designed for 32-bit system.");
 #endif
+	FILE *file;
+	char line[PATH_MAX];
+
+	file = SAFE_FOPEN("/proc/swaps", "r");
+	while (fgets(line, sizeof(line), file)) {
+		if (strstr(line, "/dev/zram")) {
+			SAFE_FCLOSE(file);
+			tst_brk(TCONF, "zram-swap is being used!");
+		}
+	}
+	SAFE_FCLOSE(file);
 
 	init_meminfo();
 
 	switch (pid = SAFE_FORK()) {
-		case 0:
-			do_alloc(0);
-			do_alloc(1);
-			exit(0);
-		default:
-			check_swapping();
+	case 0:
+		do_alloc(0);
+		do_alloc(1);
+		exit(0);
+	default:
+		check_swapping();
 	}
 }
 
-- 
2.23.0