linux-kernel - [PATCH 0/1] Possible bug in zram on ppc64le on vfat

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Message-Id: <20221107191136.18048-1-pvorel@suse.cz>
Date:   Mon,  7 Nov 2022 20:11:35 +0100
From:   Petr Vorel <pvorel@...e.cz>
To:     ltp@...ts.linux.it
Cc:     Petr Vorel <pvorel@...e.cz>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Jens Axboe <axboe@...nel.dk>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Martin Doucha <mdoucha@...e.cz>,
        Yang Xu <xuyang2018.jy@...itsu.com>
Subject: [PATCH 0/1] Possible bug in zram on ppc64le on vfat

Hi all,

following bug is trying to workaround an error on ppc64le, where
zram01.sh LTP test (there is also kernel selftest
tools/testing/selftests/zram/zram01.sh, but LTP test got further
updates) has often mem_used_total 0 although zram is already filled.

Patch tries to repeatedly read /sys/block/zram*/mm_stat for 1 sec,
waiting for mem_used_total > 0. The question if this is expected and
should be workarounded or a bug which should be fixed.

REPRODUCE THE ISSUE
Quickest way to install only zram tests and their dependencies:
make autotools && ./configure && for i in testcases/lib/ testcases/kernel/device-drivers/zram/; do cd $i && make -j$(getconf _NPROCESSORS_ONLN) && make install && cd -; done

Run the test (only on vfat)
PATH="/opt/ltp/testcases/bin:$PATH" LTP_SINGLE_FS_TYPE=vfat zram01.sh

Petr Vorel (1):
  zram01.sh: Workaround division by 0 on vfat on ppc64le

 .../kernel/device-drivers/zram/zram01.sh      | 27 +++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

-- 
2.38.0