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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:06:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:06:00 +0000
commitb15a952c52a6825376d3e7f6c1bf5c886c6d8b74 (patch)
tree1500f2f8f276908a36d8126cb632c0d6b1276764 /debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch
parentAdding upstream version 5.10.209. (diff)
downloadlinux-b15a952c52a6825376d3e7f6c1bf5c886c6d8b74.tar.xz
linux-b15a952c52a6825376d3e7f6c1bf5c886c6d8b74.zip
Adding debian version 5.10.209-2.debian/5.10.209-2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch')
-rw-r--r--debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch44
1 files changed, 44 insertions, 0 deletions
diff --git a/debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch b/debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch
new file mode 100644
index 000000000..2df18df08
--- /dev/null
+++ b/debian/patches-rt/0181-mm-memcontrol-Disable-preemption-in-__mod_memcg_lruv.patch
@@ -0,0 +1,44 @@
+From 6f35e0e3a90abef410034d9900a21e68131aa5d5 Mon Sep 17 00:00:00 2001
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Wed, 28 Oct 2020 18:15:32 +0100
+Subject: [PATCH 181/323] mm/memcontrol: Disable preemption in
+ __mod_memcg_lruvec_state()
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz
+
+The callers expect disabled preemption/interrupts while invoking
+__mod_memcg_lruvec_state(). This works mainline because a lock of
+somekind is acquired.
+
+Use preempt_disable_rt() where per-CPU variables are accessed and a
+stable pointer is expected. This is also done in __mod_zone_page_state()
+for the same reason.
+
+Cc: stable-rt@vger.kernel.org
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ mm/memcontrol.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/mm/memcontrol.c b/mm/memcontrol.c
+index ddc8ed096dec..49566afaef1c 100644
+--- a/mm/memcontrol.c
++++ b/mm/memcontrol.c
+@@ -816,6 +816,7 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
+ pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
+ memcg = pn->memcg;
+
++ preempt_disable_rt();
+ /* Update memcg */
+ __mod_memcg_state(memcg, idx, val);
+
+@@ -835,6 +836,7 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
+ x = 0;
+ }
+ __this_cpu_write(pn->lruvec_stat_cpu->count[idx], x);
++ preempt_enable_rt();
+ }
+
+ /**
+--
+2.43.0
+