linux-kernel - [PATCH net-next 3/4] lib/test_bitmap: cover explicitly byteordered arr64s

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Date:   Thu, 21 Jul 2022 17:59:49 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/4] lib/test_bitmap: cover explicitly byteordered arr64s

When testing converting bitmaps <-> arr64, test Big and Little
Endianned variants as well to make sure it works as expected on
all platforms.
Also, use more complex bitmap_validate_arr64_type() instead of just
checking the tail. It will handle different Endiannesses correctly
(note we don't pass `sizeof(arr)` to it as we poison it with 0xa5).

Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
---
 lib/test_bitmap.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index 98754ff9fe68..8a44290b60ba 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -585,7 +585,7 @@ static void __init test_bitmap_arr32(void)
 	}
 }
 
-static void __init test_bitmap_arr64(void)
+static void __init test_bitmap_arr64_type(u32 type)
 {
 	unsigned int nbits, next_bit;
 	u64 arr[EXP1_IN_BITS / 64];
@@ -594,9 +594,11 @@ static void __init test_bitmap_arr64(void)
 	memset(arr, 0xa5, sizeof(arr));
 
 	for (nbits = 0; nbits < EXP1_IN_BITS; ++nbits) {
+		int res;
+
 		memset(bmap2, 0xff, sizeof(arr));
-		bitmap_to_arr64(arr, exp1, nbits);
-		bitmap_from_arr64(bmap2, arr, nbits);
+		bitmap_to_arr64_type(arr, exp1, nbits, type);
+		bitmap_from_arr64_type(bmap2, arr, nbits, type);
 		expect_eq_bitmap(bmap2, exp1, nbits);
 
 		next_bit = find_next_bit(bmap2, round_up(nbits, BITS_PER_LONG), nbits);
@@ -604,17 +606,21 @@ static void __init test_bitmap_arr64(void)
 			pr_err("bitmap_copy_arr64(nbits == %d:"
 				" tail is not safely cleared: %d\n", nbits, next_bit);
 
-		if ((nbits % 64) &&
-		    (arr[(nbits - 1) / 64] & ~GENMASK_ULL((nbits - 1) % 64, 0)))
-			pr_err("bitmap_to_arr64(nbits == %d): tail is not safely cleared: 0x%016llx (must be 0x%016llx)\n",
-			       nbits, arr[(nbits - 1) / 64],
-			       GENMASK_ULL((nbits - 1) % 64, 0));
+		res = bitmap_validate_arr64_type(arr, bitmap_arr64_size(nbits),
+						 nbits, type);
+		expect_eq_uint(nbits ? 0 : -EINVAL, res);
 
 		if (nbits < EXP1_IN_BITS - 64)
 			expect_eq_uint(arr[DIV_ROUND_UP(nbits, 64)], 0xa5a5a5a5);
 	}
 }
 
+static void __init test_bitmap_arr64(void)
+{
+	for (u32 type = 0; type < __BITMAP_ARR_TYPE_NUM; type++)
+		test_bitmap_arr64_type(type);
+}
+
 static void noinline __init test_mem_optimisations(void)
 {
 	DECLARE_BITMAP(bmap1, 1024);
-- 
2.36.1