linux-kernel - Re: [PATCH 06/13] mm: meminit: Inline some helper functions

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Date:	Mon, 4 May 2015 10:33:56 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nathan Zimmer <nzimmer@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Waiman Long <waiman.long@...com>,
	Scott Norton <scott.norton@...com>,
	Daniel J Blueman <daniel@...ascale.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/13] mm: meminit: Inline some helper functions

On Tue 28-04-15 15:37:03, Mel Gorman wrote:
> early_pfn_in_nid() and meminit_pfn_in_nid() are small functions that are
> unnecessarily visible outside memory initialisation. As well as unnecessary
> visibility, it's unnecessary function call overhead when initialising pages.
> This patch moves the helpers inline.

This is causing:
  CC      mm/page_alloc.o
mm/page_alloc.c: In function ‘deferred_init_memmap’:
mm/page_alloc.c:1135:4: error: implicit declaration of function ‘meminit_pfn_in_nid’ [-Werror=implicit-function-declaration]
    if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) {
    ^

with randconfig test. CONFIG_NODES_SPAN_OTHER_NODES is not defined.
The full config is attached.

I guess we need something like this:

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3e0257debce0..a48128d882d8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1044,6 +1044,11 @@ 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)
+{
+	return true;
+}
 #endif
 
-- 
Michal Hocko
SUSE Labs

View attachment "config-failed" of type "text/plain" (100882 bytes)