lkml.org 
[lkml]   [2022]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/5] lib/bitmap: add test for bitmap_{from,to}_arr64
On 5/19/22 09:01, Yury Norov wrote:
> On Thu, May 19, 2022 at 8:09 AM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> 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@gmail.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.
>
> Hi Guenter,
>
> Thanks for letting me know. It's really weird because it has already
> been for 2 weeks
> in next with no issues. But I tested it on mips32, not powerpc. I'll
> check what happens
> there.
>
Oh, I have seen the problem for a while, it is just that -next is in
such a bad shape that it is difficult to bisect individual problems.

> Can you please share your config and qemu image if possible?
>

First, you have to revert commit b033767848c411
("powerpc/code-patching: Use jump_label for testing freed initmem")
to avoid a crash. After that, a recent version of qemu should work
with the following command line.

qemu-system-ppc -kernel arch/powerpc/boot/uImage -M mpc8544ds \
-m 256 -no-reboot -initrd rootfs.cpio \
--append "rdinit=/sbin/init coherent_pool=512k mem=256M console=ttyS0" \
-monitor none -nographic

Configuration is mpc85xx_defconfig with CONFIG_TEST_BITMAP enabled.
I used the root file system (initrd) from
https://github.com/groeck/linux-build-test/blob/master/rootfs/ppc/rootfs.cpio.gz

Hope this helps,
Guenter

\
 
 \ /
  Last update: 2022-05-19 20:06    [W:0.088 / U:0.688 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site