* [PATCH] memory-failure: fix section mismatch
@ 2018-03-04 7:16 ` Nick Desaulniers
0 siblings, 0 replies; 4+ messages in thread
From: Nick Desaulniers @ 2018-03-04 7:16 UTC (permalink / raw)
Cc: Nick Desaulniers, Andrew Morton, Dan Williams, Michal Hocko,
Kirill A. Shutemov, Jan Kara, Jérôme Glisse,
Hugh Dickins, Matthew Wilcox, linux-mm, linux-kernel
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);
--
2.14.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] memory-failure: fix section mismatch
@ 2018-03-04 7:16 ` Nick Desaulniers
0 siblings, 0 replies; 4+ messages in thread
From: Nick Desaulniers @ 2018-03-04 7:16 UTC (permalink / raw)
Cc: Nick Desaulniers, Andrew Morton, Dan Williams, Michal Hocko,
Kirill A. Shutemov, Jan Kara, Jérôme Glisse,
Hugh Dickins, Matthew Wilcox, linux-mm, linux-kernel
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);
--
2.14.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] memory-failure: fix section mismatch
2018-03-04 7:16 ` Nick Desaulniers
(?)
@ 2018-03-13 14:45 ` Michal Hocko
-1 siblings, 0 replies; 4+ messages in thread
From: Michal Hocko @ 2018-03-13 14:45 UTC (permalink / raw)
To: Nick Desaulniers
Cc: Andrew Morton, Dan Williams, Kirill A. Shutemov, Jan Kara,
Jérôme Glisse, Hugh Dickins, Matthew Wilcox, linux-mm,
linux-kernel
On Sat 03-03-18 23:16:11, Nick Desaulniers wrote:
> 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.
Why do we need declarations in both places? This sounds like a mess to
me.
> 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);
>
>
> --
> 2.14.1
>
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] memory-failure: fix section mismatch
2018-03-04 7:16 ` Nick Desaulniers
(?)
(?)
@ 2018-03-16 23:04 ` Matthias Kaehlcke
-1 siblings, 0 replies; 4+ messages in thread
From: Matthias Kaehlcke @ 2018-03-16 23:04 UTC (permalink / raw)
To: Nick Desaulniers
Cc: Andrew Morton, Dan Williams, Michal Hocko, Kirill A. Shutemov,
Jan Kara, Jérôme Glisse, Hugh Dickins, Matthew Wilcox,
linux-mm, linux-kernel
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/
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-03-16 23:04 UTC | newest]
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2018-03-04 7:16 [PATCH] memory-failure: fix section mismatch Nick Desaulniers
2018-03-04 7:16 ` Nick Desaulniers
2018-03-13 14:45 ` Michal Hocko
2018-03-16 23:04 ` Matthias Kaehlcke
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