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Message-ID: <46F7D5BD.7010803@openvz.org>
Date: Mon, 24 Sep 2007 19:20:29 +0400
From: Pavel Emelyanov <xemul@...nvz.org>
To: Andrew Morton <akpm@...l.org>
CC: Alexey Dobriyan <adobriyan@...nvz.org>,
Sukadev Bhattiprolu <sukadev@...ibm.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
devel@...nvz.org
Subject: [PATCH 1/2] Uninline find_task_by_xxx set of functions
The find_task_by_something is a set of macros are used to find
task by pid depending on what kind of pid is proposed - global
or virtual one. All of them are wrappers above the most generic
one - find_task_by_pid_type_ns() - and just substitute some
args for it.
It turned out, that dereferencing the current->nsproxy->pid_ns
construction and pushing one more argument on the stack inline
cause kernel text size to grow.
This patch moves all this stuff out-of-line into kernel/pid.c.
Together with the next patch it saves a bit less than 400 bytes
from the .text section.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 12ef317..8c0e146 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1495,9 +1495,8 @@ extern struct pid_namespace init_pid_ns;
* type and namespace specified
* find_task_by_pid_ns():
* finds a task by its pid in the specified namespace
- * find_task_by_pid_type():
- * finds a task by its global id with the specified type, e.g.
- * by global session id
+ * find_task_by_vpid():
+ * finds a task by its virtual pid
* find_task_by_pid():
* finds a task by its global pid
*
@@ -1507,12 +1506,10 @@ extern struct pid_namespace init_pid_ns;
extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
struct pid_namespace *ns);
-#define find_task_by_pid_ns(nr, ns) \
- find_task_by_pid_type_ns(PIDTYPE_PID, nr, ns)
-#define find_task_by_pid_type(type, nr) \
- find_task_by_pid_type_ns(type, nr, &init_pid_ns)
-#define find_task_by_pid(nr) \
- find_task_by_pid_type(PIDTYPE_PID, nr)
+extern struct task_struct *find_task_by_pid(pid_t nr);
+extern struct task_struct *find_task_by_vpid(pid_t nr);
+extern struct task_struct *find_task_by_pid_ns(pid_t nr,
+ struct pid_namespace *ns);
extern void __set_special_pids(pid_t session, pid_t pgrp);
diff --git a/kernel/pid.c b/kernel/pid.c
index e2e060e..f029c17 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -368,6 +380,25 @@ struct task_struct *find_task_by_pid_typ
EXPORT_SYMBOL(find_task_by_pid_type_ns);
+struct task_struct *find_task_by_pid(pid_t nr)
+{
+ return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
+}
+EXPORT_SYMBOL(find_task_by_pid);
+
+struct task_struct *find_task_by_vpid(pid_t vnr)
+{
+ return find_task_by_pid_type_ns(PIDTYPE_PID, vnr,
+ current->nsproxy->pid_ns);
+}
+EXPORT_SYMBOL(find_task_by_vpid);
+
+struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
+{
+ return find_task_by_pid_type_ns(PIDTYPE_PID, nr, ns);
+}
+EXPORT_SYMBOL(find_task_by_pid_ns);
+
struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
{
struct pid *pid;
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 0a615f8..d6ff77e 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -94,8 +94,7 @@ asmlinkage long sys_ioprio_set(int which
if (!who)
p = current;
else
- p = find_task_by_pid_ns(who,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(who);
if (p)
ret = set_task_ioprio(p, ioprio);
break;
@@ -182,8 +181,7 @@ asmlinkage long sys_ioprio_get(int which
if (!who)
p = current;
else
- p = find_task_by_pid_ns(who,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(who);
if (p)
ret = get_task_ioprio(p);
break;
diff --git a/kernel/capability.c b/kernel/capability.c
index 0440d6d..4a881b8 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -63,8 +63,7 @@ asmlinkage long sys_capget(cap_user_head
read_lock(&tasklist_lock);
if (pid && pid != task_pid_vnr(current)) {
- target = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
+ target = find_task_by_vpid(pid);
if (!target) {
ret = -ESRCH;
goto out;
@@ -198,8 +197,7 @@ asmlinkage long sys_capset(cap_user_head
read_lock(&tasklist_lock);
if (pid > 0 && pid != task_pid_vnr(current)) {
- target = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
+ target = find_task_by_vpid(pid);
if (!target) {
ret = -ESRCH;
goto out;
diff --git a/kernel/futex.c b/kernel/futex.c
index 0c1b777..0d51412 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -444,9 +444,7 @@ static struct task_struct * futex_find_g
struct task_struct *p;
rcu_read_lock();
- p = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
-
+ p = find_task_by_vpid(pid);
if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
p = ERR_PTR(-ESRCH);
else
@@ -1856,8 +1854,7 @@ sys_get_robust_list(int pid, struct robu
ret = -ESRCH;
rcu_read_lock();
- p = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(pid);
if (!p)
goto err_unlock;
ret = -EPERM;
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index a21e766..d64f7c3 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -118,8 +118,7 @@ compat_sys_get_robust_list(int pid, comp
ret = -ESRCH;
read_lock(&tasklist_lock);
- p = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(pid);
if (!p)
goto err_unlock;
ret = -EPERM;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 812f1f3..593afeb 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -444,8 +444,7 @@ struct task_struct *ptrace_get_task_stru
return ERR_PTR(-EPERM);
read_lock(&tasklist_lock);
- child = find_task_by_pid_ns(pid,
- current->nsproxy->pid_ns);
+ child = find_task_by_vpid(pid);
if (child)
get_task_struct(child);
diff --git a/kernel/sched.c b/kernel/sched.c
index 80f5695..ec03e40 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4156,8 +4156,7 @@ struct task_struct *idle_task(int cpu)
*/
static inline struct task_struct *find_process_by_pid(pid_t pid)
{
- return pid ?
- find_task_by_pid_ns(pid, current->nsproxy->pid_ns) : current;
+ return pid ? find_task_by_vpid(pid) : current;
}
/* Actually do priority change: must hold rq lock. */
diff --git a/kernel/signal.c b/kernel/signal.c
index c5d72be..c308c2d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2237,7 +2237,7 @@ static int do_tkill(int tgid, int pid, i
info.si_uid = current->uid;
read_lock(&tasklist_lock);
- p = find_task_by_pid_ns(pid, current->nsproxy->pid_ns);
+ p = find_task_by_vpid(pid);
if (p && (tgid <= 0 || task_tgid_vnr(p) == tgid)) {
error = check_kill_permission(sig, &info, p);
/*
diff --git a/kernel/sys.c b/kernel/sys.c
index 787b73e..796299c 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -151,8 +151,7 @@ asmlinkage long sys_setpriority(int whic
switch (which) {
case PRIO_PROCESS:
if (who)
- p = find_task_by_pid_ns(who,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(who);
else
p = current;
if (p)
@@ -209,8 +208,7 @@ asmlinkage long sys_getpriority(int whic
switch (which) {
case PRIO_PROCESS:
if (who)
- p = find_task_by_pid_ns(who,
- current->nsproxy->pid_ns);
+ p = find_task_by_vpid(who);
else
p = current;
if (p) {
@@ -1065,7 +1063,8 @@ asmlinkage long sys_setsid(void)
* session id and so the check will always fail and make it so
* init cannot successfully call setsid.
*/
- if (session > 1 && find_task_by_pid_type(PIDTYPE_PGID, session))
+ if (session > 1 && find_task_by_pid_type_ns(PIDTYPE_PGID,
+ session, &init_pid_ns))
goto out;
group_leader->signal->leader = 1;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a09ca3b..c1592a9 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -941,8 +941,7 @@ asmlinkage long sys_migrate_pages(pid_t
/* Find the mm_struct */
read_lock(&tasklist_lock);
- task = pid ?
- find_task_by_pid_ns(pid, current->nsproxy->pid_ns) : current;
+ task = pid ? find_task_by_vpid(pid) : current;
if (!task) {
read_unlock(&tasklist_lock);
return -ESRCH;
diff --git a/mm/migrate.c b/mm/migrate.c
index 6f7e4f3..7fff95d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -931,8 +931,7 @@ asmlinkage long sys_move_pages(pid_t pid
/* Find the mm_struct */
read_lock(&tasklist_lock);
- task = pid ?
- find_task_by_pid_ns(pid, current->nsproxy->pid_ns) : current;
+ task = pid ? find_task_by_vpid(pid) : current;
if (!task) {
read_unlock(&tasklist_lock);
return -ESRCH;
-
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