From: Matthias Kaehlcke <mka@chromium.org>
To: Nick Desaulniers <nick.desaulniers@gmail.com>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Michal Hocko" <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Jan Kara" <jack@suse.cz>, "Jérôme Glisse" <jglisse@redhat.com>,
"Hugh Dickins" <hughd@google.com>,
"Matthew Wilcox" <willy@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] memory-failure: fix section mismatch
Date: Fri, 16 Mar 2018 16:04:49 -0700 [thread overview]
Message-ID: <20180316230448.GA37438@google.com> (raw)
In-Reply-To: <20180304071613.16899-1-nick.desaulniers@gmail.com>
El Sat, Mar 03, 2018 at 11:16:11PM -0800 Nick Desaulniers ha dit:
> Clang complains when a variable is declared extern twice, but with two
> different sections. num_poisoned_pages is marked extern and __read_mostly
> in include/linux/swapops.h, but only extern in include/linux/mm.h. Some
> c source files must include both, and thus see the conflicting
> declarations.
>
> Signed-off-by: Nick Desaulniers <nick.desaulniers@gmail.com>
> ---
> 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);
An equivalent patch was posted by Guenter Roeck and has been picked up
by Andrew: https://patchwork.kernel.org/patch/10243919/
prev parent reply other threads:[~2018-03-16 23:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-04 7:16 [PATCH] memory-failure: fix section mismatch Nick Desaulniers
2018-03-13 14:45 ` Michal Hocko
2018-03-16 23:04 ` Matthias Kaehlcke [this message]
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