bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0089-cgroup-Disable-cgroup-memory-by-default.patch b/target/linux/bcm27xx/patches-5.4/950-0089-cgroup-Disable-cgroup-memory-by-default.patch
new file mode 100644
index 0000000000..96ab11f8ab
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0089-cgroup-Disable-cgroup-memory-by-default.patch
@@ -0,0 +1,70 @@
+From 0f95a2f2688ff44dc7080beaa2076741a0bdf510 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
+@@ -5707,6 +5707,8 @@ 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
+@@ -5746,6 +5748,12 @@ 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 =
+@@ -6165,6 +6173,28 @@ 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);
++
+ void __init __weak enable_debug_cgroup(void) { }
+ 
+ static int __init enable_cgroup_debug(char *str)