linux-kernel - compaction.h: undefined CONFIG_ZONE_HIGHMEM

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Message-ID: <20150923084320.GA16863@ubuntu-vm>
Date:	Wed, 23 Sep 2015 10:43:20 +0200
From:	Valentin Rothberg <valentinrothberg@...il.com>
To:	vbabka@...e.cz
Cc:	rostedt@...dmis.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ziegler@...fau.de, Paul Bolle <pebolle@...cali.nl>
Subject: compaction.h: undefined CONFIG_ZONE_HIGHMEM_

Hi Vlastimil,

your commit 1434c81a47e3 ("mm, compaction: export tracepoints zone names
to userspace") has shown up in todays linux-next tree (i.e., 20150923)
adding the following lines of code:

--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -18,6 +18,31 @@
[...]
+#ifdef CONFIG_ZONE_HIGHMEM_
+#define IFDEF_ZONE_HIGHMEM(X) X
+#else
+#define IFDEF_ZONE_HIGHMEM(X)
+#endif

At the current state, the #ifdef block will not see a compiler since
CONFIG_ZONE_HIGHMEM_ is not defined anywhere.  At first I thought it's a
typo as it ends with '_', but even ZONE_HIGHMEM isn't defined in
Kconfig.  Is there a patch queued somewhere to fix the issue?

I detected the issue with undertaker-checkpatch from [1].  We run a bot
daily on linux-next to detect some Kconfig related issues and bugs.

Kind regards,
 Valentin

[1] https://undertaker.cs.fau.de
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