linux-kernel - [PATCH v2 1/3] mm: provide debug_pagealloc_enabled() without CONFIG_DEBUG

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Message-Id: <1453884618-33852-2-git-send-email-borntraeger@de.ibm.com>
Date:	Wed, 27 Jan 2016 09:50:16 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
	x86@...nel.org, linuxppc-dev@...ts.ozlabs.org, davem@...emloft.net,
	Joonsoo Kim <iamjoonsoo.kim@....com>, davej@...emonkey.org.uk,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH v2 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@...ibm.com>
Acked-by: David Rientjes <rientjes@...gle.com>
---
 include/linux/mm.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7783073..56cab4e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2147,13 +2147,18 @@ kernel_map_pages(struct page *page, int numpages, int enable)
 #ifdef CONFIG_HIBERNATION
 extern bool kernel_page_present(struct page *page);
 #endif /* CONFIG_HIBERNATION */
-#else
+#else  /* CONFIG_DEBUG_PAGEALLOC */
+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
 static inline bool kernel_page_present(struct page *page) { return true; }
 #endif /* CONFIG_HIBERNATION */
-#endif
+#endif /* CONFIG_DEBUG_PAGEALLOC */
 
 #ifdef __HAVE_ARCH_GATE_AREA
 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
-- 
2.3.0