linux-kernel - [PATCH v2 6/8] mm/compaction: Get rid of RT ifdeffery

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Message-Id: <20220825164131.402717-7-bigeasy@linutronix.de>
Date:   Thu, 25 Aug 2022 18:41:29 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Terrell <terrelln@...com>, linux-mm@...ck.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v2 6/8] mm/compaction: Get rid of RT ifdeffery

From: Thomas Gleixner <tglx@...utronix.de>

Move the RT dependency for the initial value of
sysctl_compact_unevictable_allowed into Kconfig.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nick Terrell <terrelln@...com>
Cc: linux-mm@...ck.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 mm/Kconfig      | 6 ++++++
 mm/compaction.c | 6 +-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 0331f1461f81c..3897e924e40f2 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -579,6 +579,12 @@ config COMPACTION
 	  it and then we would be really interested to hear about that at
 	  linux-mm@...ck.org.
 
+config COMPACT_UNEVICTABLE_DEFAULT
+	int
+	depends on COMPACTION
+	default 0 if PREEMPT_RT
+	default 1
+
 #
 # support for free page reporting
 config PAGE_REPORTING
diff --git a/mm/compaction.c b/mm/compaction.c
index 640fa76228dd9..10561cb1aaad9 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1727,11 +1727,7 @@ typedef enum {
  * Allow userspace to control policy on scanning the unevictable LRU for
  * compactable pages.
  */
-#ifdef CONFIG_PREEMPT_RT
-int sysctl_compact_unevictable_allowed __read_mostly = 0;
-#else
-int sysctl_compact_unevictable_allowed __read_mostly = 1;
-#endif
+int sysctl_compact_unevictable_allowed __read_mostly = CONFIG_COMPACT_UNEVICTABLE_DEFAULT;
 
 static inline void
 update_fast_start_pfn(struct compact_control *cc, unsigned long pfn)
-- 
2.37.2