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From 6f5d1f04864beb65079068f48faf17c269c8509b Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 26 Feb 2021 17:26:04 +0100
Subject: [PATCH 201/323] mm: slub: Don't resize the location tracking cache on
PREEMPT_RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz
The location tracking cache has a size of a page and is resized if its
current size is too small.
This allocation happens with disabled interrupts and can't happen on
PREEMPT_RT.
Should one page be too small, then we have to allocate more at the
beginning. The only downside is that less callers will be visible.
Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
mm/slub.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/slub.c b/mm/slub.c
index cb414c1f9ef6..57c598dd7454 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4682,6 +4682,9 @@ static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags)
struct location *l;
int order;
+ if (IS_ENABLED(CONFIG_PREEMPT_RT) && flags == GFP_ATOMIC)
+ return 0;
+
order = get_order(sizeof(struct location) * max);
l = (void *)__get_free_pages(flags, order);
--
2.43.0
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