linux-kernel - Re: [PATCH v1 1/1] printk: Remove printk.h inclusion in percpu.h

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Date:   Fri, 12 Nov 2021 13:15:51 -0500
From:   Dennis Zhou <dennis@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v1 1/1] printk: Remove printk.h inclusion in percpu.h

Hello,

On Fri, Nov 12, 2021 at 04:07:49PM +0200, Andy Shevchenko wrote:
> After the commit 42a0bb3f7138 ("printk/nmi: generic solution for safe printk
> in NMI") the printk.h is not needed anymore in percpu.h.
> 
> Moreover `make headerdep` complains (an excerpt)
> 
> In file included from linux/printk.h,
>                  from linux/dynamic_debug.h:188
>                  from linux/printk.h:559 <-- here
>                  from linux/percpu.h:9
>                  from linux/idr.h:17
> include/net/9p/client.h:13: warning: recursive header inclusion
> 
> Yeah, it's not a root cause of this, but removing will help to reduce
> the noise.
> 
> Fixes: 42a0bb3f7138 ("printk/nmi: generic solution for safe printk in NMI")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  include/linux/percpu.h | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/include/linux/percpu.h b/include/linux/percpu.h
> index 98a9371133f8..ae4004e7957e 100644
> --- a/include/linux/percpu.h
> +++ b/include/linux/percpu.h
> @@ -6,7 +6,6 @@
>  #include <linux/preempt.h>
>  #include <linux/smp.h>
>  #include <linux/cpumask.h>
> -#include <linux/printk.h>
>  #include <linux/pfn.h>
>  #include <linux/init.h>
>  
> -- 
> 2.33.0
> 

Acked-by: Dennis Zhou <dennis@...nel.org>

Hey Andrew, it doesn't seem like I have anything big coming through
percpu, do you mind taking this. I might have some stuff due to sh, but
I'm still working on that with them.

Thanks,
Dennis