linux-kernel - Re: [PATCH 15/18] fix compilation with !CONFIG_NUMA

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Date:	Wed, 17 Jul 2013 21:53:53 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 15/18] fix compilation with !CONFIG_NUMA_BALANCING

On Mon, 15 Jul 2013 16:20:17 +0100
Mel Gorman <mgorman@...e.de> wrote:

> Ideally it would be possible to distinguish between NUMA hinting faults that
> are private to a task and those that are shared. If treated identically
> there is a risk that shared pages bounce between nodes depending on

Your patch 15 breaks the compile with !CONFIG_NUMA_BALANCING.

This little patch fixes it:


The code in change_pte_range unconditionally calls nidpid_to_pid,
even when CONFIG_NUMA_SCHED is disabled.  Returning -1 keeps the
value of last_nid at "don't care" and should result in the mprotect
code doing nothing NUMA-related when CONFIG_NUMA_SCHED is disabled.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 include/linux/mm.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 668f03c..0e0d190 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -731,6 +731,26 @@ static inline int page_nidpid_last(struct page *page)
 	return page_to_nid(page);
 }
 
+static inline int nidpid_to_nid(int nidpid)
+{
+	return -1;
+}
+
+static inline int nidpid_to_pid(int nidpid)
+{
+	return -1;
+}
+
+static inline int nid_pid_to_nidpid(int nid, int pid)
+{
+	return -1;
+}
+
+static inline bool nidpid_pid_unset(int nidpid)
+{
+	return 1;
+}
+
 static inline void page_nidpid_reset_last(struct page *page)
 {
 }
--
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