linux-kernel - Re: [PATCH 5.4 000/168] 5.4.25-stable review

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Date:   Tue, 10 Mar 2020 15:02:37 +0100
From:   Holger Hoffstätte <holger@...lied-asynchrony.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     linux@...ck-us.net, shuah@...nel.org, stable@...r.kernel.org,
        Paolo Valente <paolo.valente@...aro.org>
Subject: Re: [PATCH 5.4 000/168] 5.4.25-stable review

On 3/10/20 1:37 PM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 5.4.25 release.

This fails to compile due to broken patch 001/168:
"block, bfq: get a ref to a group when adding it to a service tree":

..
block/bfq-wf2q.c: In function 'bfq_get_entity':
./include/linux/kernel.h:994:51: error: 'struct bfq_group' has no member named 'entity'
..

The calls to bfq_get_entity::bfqg_and_blkg_get and bfq_forget_entity::bfqg_and_blkg_put
in bfq-wf2q.c need to be wrapped in #ifdef CONFIG_BFQ_GROUP_IOSCHED, otherwise
the build will fail when CONFIG_BFQ_GROUP_IOSCHED is not enabled.
This horribly error-prone #ifdef mess was finally removed in upstream commit
4d8340d0d4d9. For 5.4 we'll either need that as well or add them back.

-h