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-rw-r--r--target/linux/brcm2708/patches-4.19/950-0102-cgroup-Disable-cgroup-memory-by-default.patch70
1 files changed, 70 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0102-cgroup-Disable-cgroup-memory-by-default.patch b/target/linux/brcm2708/patches-4.19/950-0102-cgroup-Disable-cgroup-memory-by-default.patch
new file mode 100644
index 0000000000..f08cbebc47
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0102-cgroup-Disable-cgroup-memory-by-default.patch
@@ -0,0 +1,70 @@
+From 7ae6ba03434344f90403936ae79bfd7ba005b49c Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 27 Nov 2017 17:14:54 +0000
+Subject: [PATCH] cgroup: Disable cgroup "memory" by default
+
+Some Raspberry Pis have limited RAM and most users won't use the
+cgroup memory support so it is disabled by default. Enable with:
+
+ cgroup_enable=memory
+
+See: https://github.com/raspberrypi/linux/issues/1950
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ kernel/cgroup/cgroup.c | 30 ++++++++++++++++++++++++++++++
+ 1 file changed, 30 insertions(+)
+
+--- a/kernel/cgroup/cgroup.c
++++ b/kernel/cgroup/cgroup.c
+@@ -5334,6 +5334,8 @@ int __init cgroup_init_early(void)
+ }
+
+ static u16 cgroup_disable_mask __initdata;
++static u16 cgroup_enable_mask __initdata;
++static int __init cgroup_disable(char *str);
+
+ /**
+ * cgroup_init - cgroup initialization
+@@ -5374,6 +5376,12 @@ int __init cgroup_init(void)
+
+ mutex_unlock(&cgroup_mutex);
+
++ /* Apply an implicit disable... */
++ cgroup_disable("memory");
++
++ /* ...knowing that an explicit enable will override it. */
++ cgroup_disable_mask &= ~cgroup_enable_mask;
++
+ for_each_subsys(ss, ssid) {
+ if (ss->early_init) {
+ struct cgroup_subsys_state *css =
+@@ -5765,6 +5773,28 @@ static int __init cgroup_disable(char *s
+ }
+ __setup("cgroup_disable=", cgroup_disable);
+
++static int __init cgroup_enable(char *str)
++{
++ struct cgroup_subsys *ss;
++ char *token;
++ int i;
++
++ while ((token = strsep(&str, ",")) != NULL) {
++ if (!*token)
++ continue;
++
++ for_each_subsys(ss, i) {
++ if (strcmp(token, ss->name) &&
++ strcmp(token, ss->legacy_name))
++ continue;
++
++ cgroup_enable_mask |= 1 << i;
++ }
++ }
++ return 1;
++}
++__setup("cgroup_enable=", cgroup_enable);
++
+ /**
+ * css_tryget_online_from_dir - get corresponding css from a cgroup dentry
+ * @dentry: directory dentry of interest