cgroup: drop const from @buffer of cftype->write_string()

cftype->write_string() just passes on the writeable buffer from kernfs
and there's no reason to add const restriction on the buffer.  The
only thing const achieves is unnecessarily complicating parsing of the
buffer.  Drop const from @buffer.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>                                           
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

11 files changed, 15 insertions, 15 deletions

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 861c363e4129..033745cd7fba 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1408,13 +1408,13 @@ static int tg_set_conf(struct cgroup_subsys_state *css, struct cftype *cft,
 }
 
 static int tg_set_conf_u64(struct cgroup_subsys_state *css, struct cftype *cft,
-                           const char *buf)
+                           char *buf)
 {
         return tg_set_conf(css, cft, buf, true);
 }
 
 static int tg_set_conf_uint(struct cgroup_subsys_state *css, struct cftype *cft,
-                            const char *buf)
+                            char *buf)
 {
         return tg_set_conf(css, cft, buf, false);
 }
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 461187943392..f5de45b6af36 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1701,13 +1701,13 @@ static int __cfqg_set_weight_device(struct cgroup_subsys_state *css,
 }
 
 static int cfqg_set_weight_device(struct cgroup_subsys_state *css,
-                                  struct cftype *cft, const char *buf)
+                                  struct cftype *cft, char *buf)
 {
         return __cfqg_set_weight_device(css, cft, buf, false);
 }
 
 static int cfqg_set_leaf_weight_device(struct cgroup_subsys_state *css,
-                                       struct cftype *cft, const char *buf)
+                                       struct cftype *cft, char *buf)
 {
         return __cfqg_set_weight_device(css, cft, buf, true);
 }
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 77294fc66603..79993ac066c5 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -454,7 +454,7 @@ struct cftype {
          * Returns 0 or -ve error code.
          */
         int (*write_string)(struct cgroup_subsys_state *css, struct cftype *cft,
-                            const char *buffer);
+                            char *buffer);
         /*
          * trigger() callback can be used to get some kick from the
          * userspace, when the actual string written is not important
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 60ea16058c42..f5754910e80b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2143,7 +2143,7 @@ static int cgroup_procs_write(struct cgroup_subsys_state *css,
 }
 
 static int cgroup_release_agent_write(struct cgroup_subsys_state *css,
-                                      struct cftype *cft, const char *buffer)
+                                      struct cftype *cft, char *buffer)
 {
         struct cgroup_root *root = css->cgroup->root;
 
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 2ea98b216bff..2bc4a2256444 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -442,7 +442,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
 }
 
 static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft,
-                         const char *buffer)
+                         char *buffer)
 {
         bool freeze;
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 8d5324583aa4..efbf9baf77ec 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1610,7 +1610,7 @@ out_unlock:
  * Common handling for a write to a "cpus" or "mems" file.
  */
 static int cpuset_write_resmask(struct cgroup_subsys_state *css,
-                                struct cftype *cft, const char *buf)
+                                struct cftype *cft, char *buf)
 {
         struct cpuset *cs = css_cs(css);
         struct cpuset *trialcs;
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index b135853e68f3..595d7fd795e1 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -254,7 +254,7 @@ static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
 }
 
 static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
-                                struct cftype *cft, const char *buffer)
+                                struct cftype *cft, char *buffer)
 {
         int idx, name, ret;
         unsigned long long val;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d9c6ac1532e6..96f94a9f2faf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5242,7 +5242,7 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
  * RES_LIMIT.
  */
 static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
-                            const char *buffer)
+                            char *buffer)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
         enum res_type type;
@@ -6063,7 +6063,7 @@ static void memcg_event_ptable_queue_proc(struct file *file,
  * Interpretation of args is defined by control file implementation.
  */
 static int memcg_write_event_control(struct cgroup_subsys_state *css,
-                                     struct cftype *cft, const char *buffer)
+                                     struct cftype *cft, char *buffer)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
         struct mem_cgroup_event *event;
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index f9f3a40d3350..3825f669147b 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -186,7 +186,7 @@ static int read_priomap(struct seq_file *sf, void *v)
 }
 
 static int write_priomap(struct cgroup_subsys_state *css, struct cftype *cft,
-                         const char *buffer)
+                         char *buffer)
 {
         char devname[IFNAMSIZ + 1];
         struct net_device *dev;
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index 20a0aca9131e..d4f015ad6c84 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -103,7 +103,7 @@ static int tcp_update_limit(struct mem_cgroup *memcg, u64 val)
 }
 
 static int tcp_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
-                            const char *buffer)
+                            char *buffer)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
         unsigned long long val;
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 7f88bcde7c61..8365909f5f8c 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -496,7 +496,7 @@ static inline bool has_children(struct dev_cgroup *devcgroup)
  * parent cgroup has the access you're asking for.
  */
 static int devcgroup_update_access(struct dev_cgroup *devcgroup,
-                                   int filetype, const char *buffer)
+                                   int filetype, char *buffer)
 {
         const char *b;
         char temp[12];          /* 11 + 1 characters needed for a u32 */
@@ -652,7 +652,7 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
 }
 
 static int devcgroup_access_write(struct cgroup_subsys_state *css,
-                                  struct cftype *cft, const char *buffer)
+                                  struct cftype *cft, char *buffer)
 {
         int retval;