linux-kernel - Re: [PATCH] kprobes: Fix build errors with CONFIG

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Date:   Wed, 4 May 2022 10:53:42 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kprobes: Fix build errors with CONFIG_KRETPROBES=n

On Tue, May 3, 2022 at 8:36 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> Max Filippov reported:
>
> When building kernel with CONFIG_KRETPROBES=n kernel/kprobes.c
> compilation fails with the following messages:
>
>   kernel/kprobes.c: In function ‘recycle_rp_inst’:
>   kernel/kprobes.c:1273:32: error: implicit declaration of function
>                                    ‘get_kretprobe’
>
>   kernel/kprobes.c: In function ‘kprobe_flush_task’:
>   kernel/kprobes.c:1299:35: error: ‘struct task_struct’ has no member
>                                    named ‘kretprobe_instances’
>
> This came from the commit d741bf41d7c7 ("kprobes: Remove
> kretprobe hash") which introduced get_kretprobe() and
> kretprobe_instances member in task_struct when CONFIG_KRETPROBES=y,
> but did not make recycle_rp_inst() and kprobe_flush_task()
> depending on CONFIG_KRETPORBES.
>
> Since those functions are only used for kretprobe, move those
> functions into #ifdef CONFIG_KRETPROBE area.
>
> Reported-by: Max Filippov <jcmvbkbc@...il.com>
> Fixes: d741bf41d7c7 ("kprobes: Remove kretprobe hash")
> Cc: stable@...r.kernel.org
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  include/linux/kprobes.h |    2 -
>  kernel/kprobes.c        |  144 +++++++++++++++++++++++------------------------
>  2 files changed, 72 insertions(+), 74 deletions(-)

Tested-by: Max Filippov <jcmvbkbc@...il.com>

-- 
Thanks.
-- Max