linux-kernel - [PATCH v2 1/2] lib/test_bitmap: Correct test data offsets for 32-bit

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Date:   Thu,  9 Jan 2020 12:36:00 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Yury Norov <yury.norov@...il.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/2] lib/test_bitmap: Correct test data offsets for 32-bit

On 32-bit platform the size of long is only 32 bits which makes wrong offset
in the array of 64 bit size.

Calculate offset based on BITS_PER_LONG.

Fixes: 30544ed5de43 ("lib/bitmap: introduce bitmap_replace() helper")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: rename step -> nlongs to avoid confusion with a macro (Yury)
 lib/test_bitmap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index 5cb35a734462..707b0389db35 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -275,22 +275,23 @@ static void __init test_copy(void)
 static void __init test_replace(void)
 {
 	unsigned int nbits = 64;
+	unsigned int nlongs = DIV_ROUND_UP(nbits, BITS_PER_LONG);
 	DECLARE_BITMAP(bmap, 1024);
 
 	bitmap_zero(bmap, 1024);
-	bitmap_replace(bmap, &exp2[0], &exp2[1], exp2_to_exp3_mask, nbits);
+	bitmap_replace(bmap, &exp2[0 * nlongs], &exp2[1 * nlongs], exp2_to_exp3_mask, nbits);
 	expect_eq_bitmap(bmap, exp3_0_1, nbits);
 
 	bitmap_zero(bmap, 1024);
-	bitmap_replace(bmap, &exp2[1], &exp2[0], exp2_to_exp3_mask, nbits);
+	bitmap_replace(bmap, &exp2[1 * nlongs], &exp2[0 * nlongs], exp2_to_exp3_mask, nbits);
 	expect_eq_bitmap(bmap, exp3_1_0, nbits);
 
 	bitmap_fill(bmap, 1024);
-	bitmap_replace(bmap, &exp2[0], &exp2[1], exp2_to_exp3_mask, nbits);
+	bitmap_replace(bmap, &exp2[0 * nlongs], &exp2[1 * nlongs], exp2_to_exp3_mask, nbits);
 	expect_eq_bitmap(bmap, exp3_0_1, nbits);
 
 	bitmap_fill(bmap, 1024);
-	bitmap_replace(bmap, &exp2[1], &exp2[0], exp2_to_exp3_mask, nbits);
+	bitmap_replace(bmap, &exp2[1 * nlongs], &exp2[0 * nlongs], exp2_to_exp3_mask, nbits);
 	expect_eq_bitmap(bmap, exp3_1_0, nbits);
 }
 
-- 
2.24.1