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From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 25 Aug 2022 18:41:29 +0200
Subject: [PATCH 6/8] mm/compaction: Get rid of RT ifdeffery
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.0/older/patches-6.0-rt11.tar.xz
Move the RT dependency for the initial value of
sysctl_compact_unevictable_allowed into Kconfig.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Terrell <terrelln@fb.com>
Cc: linux-mm@kvack.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220825164131.402717-7-bigeasy@linutronix.de
---
mm/Kconfig | 6 ++++++
mm/compaction.c | 6 +-----
2 files changed, 7 insertions(+), 5 deletions(-)
--- 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@kvack.org.
+config COMPACT_UNEVICTABLE_DEFAULT
+ int
+ depends on COMPACTION
+ default 0 if PREEMPT_RT
+ default 1
+
#
# support for free page reporting
config PAGE_REPORTING
--- 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)
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