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Date: Fri, 10 Jul 2009 17:42:31 +0900
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To: linux-kernel@...r.kernel.org
Subject: [RFC 1/2] move binfmt filed to signal_struct
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Because the binfmt is not different between threads in the same process,
it can be moved from task_struct to signal_struct.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
fs/exec.c | 6 +++---
include/linux/sched.h | 2 +-
kernel/exit.c | 4 ++--
kernel/fork.c | 7 ++++---
4 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index 4a8849e..402d3b8 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1377,13 +1377,13 @@ out_ret:
int set_binfmt(struct linux_binfmt *new)
{
- struct linux_binfmt *old = current->binfmt;
+ struct linux_binfmt *old = current->signal->binfmt;
if (new) {
if (!try_module_get(new->module))
return -1;
}
- current->binfmt = new;
+ current->signal->binfmt = new;
if (old)
module_put(old->module);
return 0;
@@ -1730,7 +1730,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
audit_core_dumps(signr);
- binfmt = current->binfmt;
+ binfmt = current->signal->binfmt;
if (!binfmt || !binfmt->core_dump)
goto fail;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0085d75..2a6eb81 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -576,6 +576,7 @@ struct signal_struct {
int leader;
struct tty_struct *tty; /* NULL if no tty */
+ struct linux_binfmt *binfmt;
/*
* Cumulative resource counters for dead threads in the group,
@@ -1211,7 +1212,6 @@ struct task_struct {
struct mm_struct *mm, *active_mm;
/* task state */
- struct linux_binfmt *binfmt;
int exit_state;
int exit_code, exit_signal;
int pdeath_signal; /* The signal sent when the parent dies */
diff --git a/kernel/exit.c b/kernel/exit.c
index 628d41f..708348a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -971,8 +971,8 @@ NORET_TYPE void do_exit(long code)
disassociate_ctty(1);
module_put(task_thread_info(tsk)->exec_domain->module);
- if (tsk->binfmt)
- module_put(tsk->binfmt->module);
+ if (tsk->signal->binfmt)
+ module_put(tsk->signal->binfmt->module);
proc_exit_connector(tsk);
diff --git a/kernel/fork.c b/kernel/fork.c
index 467746b..dfb9d0a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -847,6 +847,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->leader = 0; /* session leadership doesn't inherit */
sig->tty_old_pgrp = NULL;
sig->tty = NULL;
+ sig->binfmt = current->signal->binfmt;
sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
sig->gtime = cputime_zero;
@@ -1014,7 +1015,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (!try_module_get(task_thread_info(p)->exec_domain->module))
goto bad_fork_cleanup_count;
- if (p->binfmt && !try_module_get(p->binfmt->module))
+ if (p->signal->binfmt && !try_module_get(p->signal->binfmt->module))
goto bad_fork_cleanup_put_domain;
p->did_exec = 0;
@@ -1301,8 +1302,8 @@ bad_fork_cleanup_cgroup:
#endif
cgroup_exit(p, cgroup_callbacks_done);
delayacct_tsk_free(p);
- if (p->binfmt)
- module_put(p->binfmt->module);
+ if (p->signal->binfmt)
+ module_put(p->signal->binfmt->module);
bad_fork_cleanup_put_domain:
module_put(task_thread_info(p)->exec_domain->module);
bad_fork_cleanup_count:
--
1.6.2.5
--
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