linux-kernel - Re: [PATCH 3/5] lib/bitmap: add test for bitmap_{from,to}

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Message-ID: <20220519150929.GA3145933@roeck-us.net>
Date:   Thu, 19 May 2022 08:09:29 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Yury Norov <yury.norov@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] lib/bitmap: add test for bitmap_{from,to}_arr64

On Thu, Apr 28, 2022 at 01:51:14PM -0700, Yury Norov wrote:
> Test newly added bitmap_{from,to}_arr64() functions similarly to
> already existing bitmap_{from,to}_arr32() tests.
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>

With this patch in linux-next (including next-20220519), I see lots of
bitmap test errors when booting 32-bit ppc images in qemu. Examples:

test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0", got "0,65"
...
test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128"
test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128-129"
test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65", got "0,65,128-130"
...
test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65,128-143", got "0,65,128-143,208-209"
test_bitmap: [lib/test_bitmap.c:600] bitmaps contents differ: expected "0,65,128-143", got "0,65,128-143,208-210"

and so on. It only  gets worse from there, and ends with:

test_bitmap: parselist: 14: input is '0-2047:128/256' OK, Time: 4274
test_bitmap: bitmap_print_to_pagebuf: input is '0-32767
', Time: 127267
test_bitmap: failed 337 out of 3801 tests

Other architectures and 64-bit ppc builds seem to be fine. 

Guenter