1 files changed, 34 insertions, 0 deletions
diff --git a/debian/patches-rt/0334-mm-slub-Don-t-resize-the-location-tracking-cache-on-.patch b/debian/patches-rt/0334-mm-slub-Don-t-resize-the-location-tracking-cache-on-.patch
new file mode 100644
index 000000000..827afb4dd
--- /dev/null
+++ b/debian/patches-rt/0334-mm-slub-Don-t-resize-the-location-tracking-cache-on-.patch
@@ -0,0 +1,34 @@
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Fri, 26 Feb 2021 17:26:04 +0100
+Subject: [PATCH 334/342] mm: slub: Don't resize the location tracking cache on
+ PREEMPT_RT
+Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=cbb851e2f49e471db5e2ea40478394b48139f4ca
+
+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.
+
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+(cherry picked from commit 87bd0bf324f4c5468ea3d1de0482589f491f3145)
+Signed-off-by: Clark Williams <williams@redhat.com>
+---
+ mm/slub.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/mm/slub.c b/mm/slub.c
+index de80b015fb99..46158ba761ce 100644
+--- a/mm/slub.c
++++ b/mm/slub.c
+@@ -4591,6 +4591,9 @@ 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);