linux-kernel - Re: [PATCH] mm: Provide consistent declaration for num_poisoned

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Message-ID: <alpine.DEB.2.20.1802261556420.236524@chino.kir.corp.google.com>
Date:   Mon, 26 Feb 2018 15:57:32 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>
cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH] mm: Provide consistent declaration for
 num_poisoned_pages

On Mon, 26 Feb 2018, Guenter Roeck wrote:

> clang reports the following compile warning.
> 
> In file included from mm/vmscan.c:56:
> ./include/linux/swapops.h:327:22: warning:
> 	section attribute is specified on redeclared variable [-Wsection]
> extern atomic_long_t num_poisoned_pages __read_mostly;
>                      ^
> ./include/linux/mm.h:2585:22: note: previous declaration is here
> extern atomic_long_t num_poisoned_pages;
>                      ^
> 
> Let's use __read_mostly everywhere.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> Cc: Matthias Kaehlcke <mka@...omium.org>
> ---
>  include/linux/mm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ad06d42adb1a..bd4bd59f02c1 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2582,7 +2582,7 @@ extern int get_hwpoison_page(struct page *page);
>  extern int sysctl_memory_failure_early_kill;
>  extern int sysctl_memory_failure_recovery;
>  extern void shake_page(struct page *p, int access);
> -extern atomic_long_t num_poisoned_pages;
> +extern atomic_long_t num_poisoned_pages __read_mostly;
>  extern int soft_offline_page(struct page *page, int flags);
>  
>  

No objection to the patch, of course, but I'm wondering if it's (1) the 
only such clang compile warning for mm/, and (2) if the re-declaration in 
mm.h could be avoided by including swapops.h?