[LTP] [PATCH v1] Fixes: #776, tst_taint prints human readable error messages instead of numerical codes

[Kushal Chand]

This patch prints human readable messages when kernel is tainted instead
of numerical codes.

Git Hub Issue link  - https://github.com/linux-test-project/ltp/issues/776

Signed-off-by: Kushal Chand <kushalkataria5@gmail.com>

---
 lib/tst_taint.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/lib/tst_taint.c b/lib/tst_taint.c
index 49146aacb..049769873 100644
--- a/lib/tst_taint.c
+++ b/lib/tst_taint.c
@@ -8,6 +8,48 @@
 
 static unsigned int taint_mask = -1;
 
+struct pair {
+	const char *name;
+	int val;
+};
+
+#define PAIR(def)[def] = {.name = #def, .val = def},
+
+#define STRPAIR(key, value)[key] = {.name = value, .val = key},
+
+#define PAIR_LOOKUP(pair_arr, idx) do {			      \
+	if (idx < 0 || (size_t)idx >= ARRAY_SIZE(pair_arr) || \
+	    pair_arr[idx].name == NULL)			      \
+		return "???";				      \
+	return pair_arr[idx].name;			      \
+} while (0)
+
+const char *tst_strtaint(int err)
+{
+	static const struct pair taint_pairs[] = {
+		STRPAIR(TST_TAINT_A, "TAINT_A(ACPI table overridden)")
+		STRPAIR(TST_TAINT_B, "TAINT_B(Bad page reference)")
+		STRPAIR(TST_TAINT_C, "TAINT_C(Staging driver loaded)")
+		STRPAIR(TST_TAINT_D, "TAINT_D(OOPS/BUG)")
+		STRPAIR(TST_TAINT_E, "TAINT_E(Unsigned module loaded)")
+		STRPAIR(TST_TAINT_F, "TAINT_F(Module force loaded)")
+		STRPAIR(TST_TAINT_G, "TAINT_G(Propriety module loaded)")
+		STRPAIR(TST_TAINT_I, "TAINT_I(Workaround BIOS/FW bug)")
+		STRPAIR(TST_TAINT_K, "TAINT_K(Live patched)")
+		STRPAIR(TST_TAINT_L, "TAINT_L(Soft lock up occured)")
+		STRPAIR(TST_TAINT_M, "TAINT_M(Machine check exception)")
+		STRPAIR(TST_TAINT_O, "TAINT_O(Out of tree module loaded)")
+		STRPAIR(TST_TAINT_R, "TAINT_R(Module force unloaded)")
+		STRPAIR(TST_TAINT_S, "TAINT_S(Running on out of spec system)")
+		STRPAIR(TST_TAINT_T, "TAINT_T(Built with struct randomization)")
+		STRPAIR(TST_TAINT_U, "TAINT_U(User request)")
+		STRPAIR(TST_TAINT_W, "TAINT_W(Warning)")
+		STRPAIR(TST_TAINT_X, "TAINT_X(Auxilary)")
+	};
+
+	PAIR_LOOKUP(taint_pairs, err);
+}
+
 static unsigned int tst_taint_read(void)
 {
 	unsigned int val;
@@ -90,7 +132,8 @@ void tst_taint_init(unsigned int mask)
 	}
 
 	if ((taint & taint_mask) != 0)
-		tst_brk(TBROK, "Kernel is already tainted: %u", taint);
+		tst_brk(TBROK, "Kernel is already tainted: %s",
+			tst_strtaint(taint));
 }
 
 
-- 
2.25.1