linux-kernel - [PATCH 5.5 08/23] lib/test_bitmap: correct test data offsets for 32-bit

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Date:   Mon,  3 Feb 2020 16:20:28 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Yury Norov <yury.norov@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.5 08/23] lib/test_bitmap: correct test data offsets for 32-bit

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

commit 69334ca530da80c1563ac6a3bd32afa40884ccd3 upstream.

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.

Link: http://lkml.kernel.org/r/20200109103601.45929-1-andriy.shevchenko@linux.intel.com
Fixes: 30544ed5de43 ("lib/bitmap: introduce bitmap_replace() helper")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reported-by: Guenter Roeck <linux@...ck-us.net>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Yury Norov <yury.norov@...il.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/test_bitmap.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- 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);
 }