linux-kernel - Re: [PATCH] kcov: Remove kcov include from sched.h and move it to its users.

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Message-ID: <CAAeHK+x92X_NZt7MXw1a_=23tLqKyiuOesGHo_Y=aqdZZqdzEQ@mail.gmail.com>
Date:   Thu, 18 Feb 2021 19:52:26 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johannes Berg <johannes@...solutions.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] kcov: Remove kcov include from sched.h and move it to its users.

On Thu, Feb 18, 2021 at 6:31 PM Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
>
> The recent addition of in_serving_softirq() to kconv.h results in
> compile failure on PREEMPT_RT because it requires
> task_struct::softirq_disable_cnt. This is not available if kconv.h is
> included from sched.h.
>
> It is not needed to include kconv.h from sched.h. All but the net/ user
> already include the kconv header file.
>
> Move the include of the kconv.h header from sched.h it its users.
> Additionally include sched.h from kconv.h to ensure that everything
> task_struct related is available.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  include/linux/kcov.h  | 1 +
>  include/linux/sched.h | 1 -
>  net/core/skbuff.c     | 1 +
>  net/mac80211/iface.c  | 1 +
>  net/mac80211/rx.c     | 1 +
>  5 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/kcov.h b/include/linux/kcov.h
> index 4e3037dc12048..55dc338f6bcdd 100644
> --- a/include/linux/kcov.h
> +++ b/include/linux/kcov.h
> @@ -2,6 +2,7 @@
>  #ifndef _LINUX_KCOV_H
>  #define _LINUX_KCOV_H
>
> +#include <linux/sched.h>
>  #include <uapi/linux/kcov.h>
>
>  struct task_struct;
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 7337630326751..183e9d90841cb 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -14,7 +14,6 @@
>  #include <linux/pid.h>
>  #include <linux/sem.h>
>  #include <linux/shm.h>
> -#include <linux/kcov.h>
>  #include <linux/mutex.h>
>  #include <linux/plist.h>
>  #include <linux/hrtimer.h>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 785daff48030d..e64d0a2e21c31 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -60,6 +60,7 @@
>  #include <linux/prefetch.h>
>  #include <linux/if_vlan.h>
>  #include <linux/mpls.h>
> +#include <linux/kcov.h>
>
>  #include <net/protocol.h>
>  #include <net/dst.h>
> diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
> index b31417f40bd56..39943c33abbfa 100644
> --- a/net/mac80211/iface.c
> +++ b/net/mac80211/iface.c
> @@ -15,6 +15,7 @@
>  #include <linux/if_arp.h>
>  #include <linux/netdevice.h>
>  #include <linux/rtnetlink.h>
> +#include <linux/kcov.h>
>  #include <net/mac80211.h>
>  #include <net/ieee80211_radiotap.h>
>  #include "ieee80211_i.h"
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index 972895e9f22dc..3527b17f235a8 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -17,6 +17,7 @@
>  #include <linux/etherdevice.h>
>  #include <linux/rcupdate.h>
>  #include <linux/export.h>
> +#include <linux/kcov.h>
>  #include <linux/bitops.h>
>  #include <net/mac80211.h>
>  #include <net/ieee80211_radiotap.h>
> --
> 2.30.0

Acked-by: Andrey Konovalov <andreyknvl@...gle.com>