compaction.h: undefined CONFIG_ZONE_HIGHMEM_

[Valentin Rothberg]

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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