From ae026b2aa19350f3c863df2dce7e0511dd78ff49 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Fri, 17 Jul 2015 16:23:48 -0700 Subject: [PATCH] mm, meminit: suppress unused memory variable warning The kbuild test robot reported the following tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 14a6f1989dae9445d4532941bdd6bbad84f4c8da commit: 3b242c66ccbd60cf47ab0e8992119d9617548c23 x86: mm: enable deferred struct page initialisation on x86-64 date: 3 days ago config: x86_64-randconfig-x006-201527 (attached as .config) reproduce: git checkout 3b242c66ccbd60cf47ab0e8992119d9617548c23 # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): mm/page_alloc.c: In function 'early_page_uninitialised': >> mm/page_alloc.c:247:6: warning: unused variable 'nid' [-Wunused-variable] int nid = early_pfn_to_nid(pfn); It's due to the NODE_DATA macro ignoring the nid parameter on !NUMA configurations. This patch avoids the warning by not declaring nid. Signed-off-by: Mel Gorman Reported-by: Wu Fengguang Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 506eac8b38af..ac05e7ae399e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -246,9 +246,7 @@ static inline void reset_deferred_meminit(pg_data_t *pgdat) /* Returns true if the struct page for the pfn is uninitialised */ static inline bool __meminit early_page_uninitialised(unsigned long pfn) { - int nid = early_pfn_to_nid(pfn); - - if (pfn >= NODE_DATA(nid)->first_deferred_pfn) + if (pfn >= NODE_DATA(early_pfn_to_nid(pfn))->first_deferred_pfn) return true; return false; -- GitLab