Adding debian version 4.19.249-2.debian/4.19.249-2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 145 insertions, 0 deletions

diff --git a/debian/patches-rt/0079-mm-vmstat-Protect-per-cpu-variables-with-preempt-dis.patch b/debian/patches-rt/0079-mm-vmstat-Protect-per-cpu-variables-with-preempt-dis.patch
new file mode 100644
index 000000000..0c7ea39e8
--- /dev/null
+++ b/debian/patches-rt/0079-mm-vmstat-Protect-per-cpu-variables-with-preempt-dis.patch
@@ -0,0 +1,145 @@
+From a61a39e63a0af178f57da615a22877b00fee0a58 Mon Sep 17 00:00:00 2001
+From: Ingo Molnar <mingo@elte.hu>
+Date: Fri, 3 Jul 2009 08:30:13 -0500
+Subject: [PATCH 079/347] mm/vmstat: Protect per cpu variables with preempt
+ disable on RT
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+Disable preemption on -RT for the vmstat code. On vanila the code runs in
+IRQ-off regions while on -RT it is not. "preempt_disable" ensures that the
+same ressources is not updated in parallel due to preemption.
+
+Signed-off-by: Ingo Molnar <mingo@elte.hu>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ include/linux/vmstat.h |  4 ++++
+ mm/vmstat.c            | 12 ++++++++++++
+ 2 files changed, 16 insertions(+)
+
+diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
+index f25cef84b41d..febee8649220 100644
+--- a/include/linux/vmstat.h
++++ b/include/linux/vmstat.h
+@@ -54,7 +54,9 @@ DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
+  */
+ static inline void __count_vm_event(enum vm_event_item item)
+ {
++	preempt_disable_rt();
+ 	raw_cpu_inc(vm_event_states.event[item]);
++	preempt_enable_rt();
+ }
+ 
+ static inline void count_vm_event(enum vm_event_item item)
+@@ -64,7 +66,9 @@ static inline void count_vm_event(enum vm_event_item item)
+ 
+ static inline void __count_vm_events(enum vm_event_item item, long delta)
+ {
++	preempt_disable_rt();
+ 	raw_cpu_add(vm_event_states.event[item], delta);
++	preempt_enable_rt();
+ }
+ 
+ static inline void count_vm_events(enum vm_event_item item, long delta)
+diff --git a/mm/vmstat.c b/mm/vmstat.c
+index 21e07e71ea2d..ff7c0d08f2b6 100644
+--- a/mm/vmstat.c
++++ b/mm/vmstat.c
+@@ -320,6 +320,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ 	long x;
+ 	long t;
+ 
++	preempt_disable_rt();
+ 	x = delta + __this_cpu_read(*p);
+ 
+ 	t = __this_cpu_read(pcp->stat_threshold);
+@@ -329,6 +330,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
+ 		x = 0;
+ 	}
+ 	__this_cpu_write(*p, x);
++	preempt_enable_rt();
+ }
+ EXPORT_SYMBOL(__mod_zone_page_state);
+ 
+@@ -340,6 +342,7 @@ void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
+ 	long x;
+ 	long t;
+ 
++	preempt_disable_rt();
+ 	x = delta + __this_cpu_read(*p);
+ 
+ 	t = __this_cpu_read(pcp->stat_threshold);
+@@ -349,6 +352,7 @@ void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
+ 		x = 0;
+ 	}
+ 	__this_cpu_write(*p, x);
++	preempt_enable_rt();
+ }
+ EXPORT_SYMBOL(__mod_node_page_state);
+ 
+@@ -381,6 +385,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
+ 	s8 __percpu *p = pcp->vm_stat_diff + item;
+ 	s8 v, t;
+ 
++	preempt_disable_rt();
+ 	v = __this_cpu_inc_return(*p);
+ 	t = __this_cpu_read(pcp->stat_threshold);
+ 	if (unlikely(v > t)) {
+@@ -389,6 +394,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
+ 		zone_page_state_add(v + overstep, zone, item);
+ 		__this_cpu_write(*p, -overstep);
+ 	}
++	preempt_enable_rt();
+ }
+ 
+ void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+@@ -397,6 +403,7 @@ void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+ 	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+ 	s8 v, t;
+ 
++	preempt_disable_rt();
+ 	v = __this_cpu_inc_return(*p);
+ 	t = __this_cpu_read(pcp->stat_threshold);
+ 	if (unlikely(v > t)) {
+@@ -405,6 +412,7 @@ void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+ 		node_page_state_add(v + overstep, pgdat, item);
+ 		__this_cpu_write(*p, -overstep);
+ 	}
++	preempt_enable_rt();
+ }
+ 
+ void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
+@@ -425,6 +433,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
+ 	s8 __percpu *p = pcp->vm_stat_diff + item;
+ 	s8 v, t;
+ 
++	preempt_disable_rt();
+ 	v = __this_cpu_dec_return(*p);
+ 	t = __this_cpu_read(pcp->stat_threshold);
+ 	if (unlikely(v < - t)) {
+@@ -433,6 +442,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
+ 		zone_page_state_add(v - overstep, zone, item);
+ 		__this_cpu_write(*p, overstep);
+ 	}
++	preempt_enable_rt();
+ }
+ 
+ void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+@@ -441,6 +451,7 @@ void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+ 	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+ 	s8 v, t;
+ 
++	preempt_disable_rt();
+ 	v = __this_cpu_dec_return(*p);
+ 	t = __this_cpu_read(pcp->stat_threshold);
+ 	if (unlikely(v < - t)) {
+@@ -449,6 +460,7 @@ void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+ 		node_page_state_add(v - overstep, pgdat, item);
+ 		__this_cpu_write(*p, overstep);
+ 	}
++	preempt_enable_rt();
+ }
+ 
+ void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
+-- 
+2.36.1
+