Shrink task_struct if CONFIG_FUTEX=n

robust_list, compat_robust_list, pi_state_list, pi_state_cache are
really used if futexes are on.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 87f2eb2..5716658 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1132,13 +1132,14 @@ struct task_struct {
        int cpuset_mems_generation;
        int cpuset_mem_spread_rotor;
 #endif
+#ifdef CONFIG_FUTEX
        struct robust_list_head __user *robust_list;
 #ifdef CONFIG_COMPAT
        struct compat_robust_list_head __user *compat_robust_list;
 #endif
        struct list_head pi_state_list;
        struct futex_pi_state *pi_state_cache;
-
+#endif
        atomic_t fs_excl;       /* holding fs exclusive resources */
        struct rcu_head rcu;
 

diff --git a/kernel/exit.c b/kernel/exit.c
index 4c108df..2c704c8 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -947,12 +947,14 @@ fastcall NORET_TYPE void do_exit(long code)
                exit_itimers(tsk->signal);
        }
        acct_collect(code, group_dead);
+#ifdef CONFIG_FUTEX
        if (unlikely(tsk->robust_list))
                exit_robust_list(tsk);
-#if defined(CONFIG_FUTEX) && defined(CONFIG_COMPAT)
+#ifdef CONFIG_COMPAT
        if (unlikely(tsk->compat_robust_list))
                compat_exit_robust_list(tsk);
 #endif
+#endif
        if (group_dead)
                tty_audit_exit();
        if (unlikely(tsk->audit_context))
@@ -987,6 +989,7 @@ fastcall NORET_TYPE void do_exit(long code)
        mpol_free(tsk->mempolicy);
        tsk->mempolicy = NULL;
 #endif
+#ifdef CONFIG_FUTEX
        /*
         * This must happen late, after the PID is not
         * hashed anymore:
@@ -995,6 +998,7 @@ fastcall NORET_TYPE void do_exit(long code)
                exit_pi_state_list(tsk);
        if (unlikely(current->pi_state_cache))
                kfree(current->pi_state_cache);
+#endif
        /*
         * Make sure we are holding no locks:
         */

diff --git a/kernel/fork.c b/kernel/fork.c
index 8a97e92..3e764f6 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1156,13 +1156,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         * Clear TID on mm_release()?
         */
        p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL;
+#ifdef CONFIG_FUTEX
        p->robust_list = NULL;
 #ifdef CONFIG_COMPAT
        p->compat_robust_list = NULL;
 #endif
        INIT_LIST_HEAD(&p->pi_state_list);
        p->pi_state_cache = NULL;
-
+#endif
        /*
         * sigaltstack should be cleared when sharing the same VM
         */