linux-kernel - [PATCH] mm: hide a #warning for COMPILE

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Date:   Fri, 16 Feb 2018 16:25:53 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dave Jiang <dave.jiang@...el.com>, Jan Kara <jack@...e.cz>,
        Ingo Molnar <mingo@...nel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Huang Ying <ying.huang@...el.com>,
        Matthew Wilcox <willy@...ux.intel.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>, Tobin C Harding <me@...in.cc>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: hide a #warning for COMPILE_TEST

We get a warning about some slow configurations in randconfig kernels:

mm/memory.c:83:2: error: #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. [-Werror=cpp]

The warning is reasonable by itself, but gets in the way of
randconfig build testing, so I'm hiding it whenever CONFIG_COMPILE_TEST
is set. The warning was added in 2013 in commit 75980e97dacc ("mm: fold
page->_last_nid into page->flags where possible").

Cc: stable@...r.kernel.org
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index a728bed16c20..fc7779165dcf 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -81,7 +81,7 @@
 
 #include "internal.h"
 
-#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
+#if defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) && !defined(CONFIG_COMPILE_TEST)
 #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.
 #endif
 
-- 
2.9.0