linux-kernel - [PATCH BUGFIX RFC 0/2] reverting two commits causing freezes

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Date:   Fri, 18 Jan 2019 12:52:17 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, linus.walleij@...aro.org,
        broonie@...nel.org, bfq-iosched@...glegroups.com,
        oleksandr@...alenko.name, hurikhan77+bko@...il.com,
        Paolo Valente <paolo.valente@...aro.org>
Subject: [PATCH BUGFIX RFC 0/2] reverting two commits causing freezes

Hi Jens,
a user reported a warning, followed by freezes, in case he increases
nr_requests to more than 64 [1]. After reproducing the issues, I
reverted the commit f0635b8a416e ("bfq: calculate shallow depths at
init time"), plus the related commit bd7d4ef6a4c9 ("bfq-iosched:
remove unused variable"). The problem went away.

Maybe the assumption in commit f0635b8a416e ("bfq: calculate shallow
depths at init time") does not hold true?

Thanks,
Paolo

[1] https://bugzilla.kernel.org/show_bug.cgi?id=200813

Paolo Valente (2):
  Revert "bfq-iosched: remove unused variable"
  Revert "bfq: calculate shallow depths at init time"

 block/bfq-iosched.c | 116 ++++++++++++++++++++++----------------------
 block/bfq-iosched.h |   6 +++
 2 files changed, 63 insertions(+), 59 deletions(-)

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2.20.1