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[PATCH/RFC 1/3] mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC

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  [PATCH/RFC 1/3] mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-26 10:20 +0100
    Re: [PATCH/RFC 1/3] mm: provide debug_pagealloc_enabled() without  CONFIG_DEBUG_PAGEALLOC David Rientjes <rientjes@google.com> - 2016-01-27 00:30 +0100

#1317658 — [PATCH/RFC 1/3] mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC

We can provide debug_pagealloc_enabled() also if CONFIG_DEBUG_PAGEALLOC
is not set. It will return false in that case.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 include/linux/mm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7783073..fbc5354 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2148,6 +2148,10 @@ kernel_map_pages(struct page *page, int numpages, int enable)
 extern bool kernel_page_present(struct page *page);
 #endif /* CONFIG_HIBERNATION */
 #else
+static inline bool debug_pagealloc_enabled(void)
+{
+	return false;
+}
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable) {}
 #ifdef CONFIG_HIBERNATION
-- 
2.3.0

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#1318465 — Re: [PATCH/RFC 1/3] mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG_PAGEALLOC

On Tue, 26 Jan 2016, Christian Borntraeger wrote:

> We can provide debug_pagealloc_enabled() also if CONFIG_DEBUG_PAGEALLOC
> is not set. It will return false in that case.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  include/linux/mm.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 7783073..fbc5354 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2148,6 +2148,10 @@ kernel_map_pages(struct page *page, int numpages, int enable)
>  extern bool kernel_page_present(struct page *page);
>  #endif /* CONFIG_HIBERNATION */
>  #else
> +static inline bool debug_pagealloc_enabled(void)
> +{
> +	return false;
> +}
>  static inline void
>  kernel_map_pages(struct page *page, int numpages, int enable) {}
>  #ifdef CONFIG_HIBERNATION

Since the patchset needs to be refreshed based on Heiko and Thomas's 
comments, please add some /* CONFIG_DEBUG_PAGEALLOC */ annotation to the 
#else and #endif lines so this block is easier to read.  After that, feel 
free to add

	Acked-by: David Rientjes <rientjes@google.com>

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