linux-kernel - [PATCH] mm, page_alloc: Mark bad_range() and meminit_pfn_in_nid() as __maybe

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Date:   Thu, 18 May 2017 11:20:30 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] mm, page_alloc: Mark bad_range() and meminit_pfn_in_nid() as __maybe_unused

The functions are not used in some configurations. Adding the attribute
fixes the following warnings when building with clang:

mm/page_alloc.c:409:19: error: function 'bad_range' is not needed and
    will not be emitted [-Werror,-Wunneeded-internal-declaration]

mm/page_alloc.c:1106:30: error: unused function 'meminit_pfn_in_nid'
    [-Werror,-Wunused-function]

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 mm/page_alloc.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f9e450c6b6e4..30d0dede3cf4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -500,7 +500,7 @@ static int page_is_consistent(struct zone *zone, struct page *page)
 /*
  * Temporary debugging check for pages not lying within a given zone.
  */
-static int bad_range(struct zone *zone, struct page *page)
+static int __maybe_unused bad_range(struct zone *zone, struct page *page)
 {
 	if (page_outside_zone_boundaries(zone, page))
 		return 1;
@@ -510,7 +510,7 @@ static int bad_range(struct zone *zone, struct page *page)
 	return 0;
 }
 #else
-static inline int bad_range(struct zone *zone, struct page *page)
+static inline int __maybe_unused bad_range(struct zone *zone, struct page *page)
 {
 	return 0;
 }
@@ -1286,8 +1286,9 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
 #endif
 
 #ifdef CONFIG_NODES_SPAN_OTHER_NODES
-static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node,
-					struct mminit_pfnnid_cache *state)
+static inline bool __meminit __maybe_unused
+meminit_pfn_in_nid(unsigned long pfn, int node,
+		   struct mminit_pfnnid_cache *state)
 {
 	int nid;
 
@@ -1309,8 +1310,9 @@ static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
 {
 	return true;
 }
-static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node,
-					struct mminit_pfnnid_cache *state)
+static inline bool __meminit  __maybe_unused
+meminit_pfn_in_nid(unsigned long pfn, int node,
+		   struct mminit_pfnnid_cache *state)
 {
 	return true;
 }
-- 
2.13.0.303.g4ebf302169-goog