brcm2708: organize kernel patches

[openwrt/staging/chunkeey.git] / target / linux / brcm2708 / patches-4.19 / 950-0102-cgroup-Disable-cgroup-memory-by-default.patch

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 (file)
index 0000000..f08cbeb
--- /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