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Hi,
I'm trying to port the ipc stuff to work as a subsystem in order to
have sysfs outputs (/sysfs/ipc/sem {,shm,msg} ) .
Output I have is an early oops (which is not reported in /var/log
...)
It seems the ipc stuff init begins before kobject stuff or something
?
"EIP is at sysfs_create_dir
<0>kernel panic : attempted to kill the idle task!
"
Here is my patch attached + complete files
Someone could help ?
Regards,
Fabian
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diff -Naur ipc/shm.c ./../linux-2.5.74ff1/ipc/shm.c=0A=
--- ipc/shm.c 2003-07-02 22:48:07.000000000 +0200=0A=
+++ ./../linux-2.5.74ff1/ipc/shm.c 2003-07-07 22:32:45.000000000 =
+0200=0A=
@@ -13,6 +13,7 @@=0A=
* Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com>=0A=
* Move the mm functionality over to mm/shmem.c, Christoph Rohland =
<cr@sap.com>=0A=
*=0A=
+ * /sys/ipc support (c) 2003 Fabian =
Fr=E9d=E9rick<ffrederick@users.sourceforge.net>=0A=
*/=0A=
=0A=
#include <linux/config.h>=0A=
@@ -27,7 +28,8 @@=0A=
#include <linux/shmem_fs.h>=0A=
#include <linux/security.h>=0A=
#include <asm/uaccess.h>=0A=
-=0A=
+#include <linux/kobject.h>=0A=
+#include <linux/kobj_map.h>=0A=
#include "util.h"=0A=
=0A=
#define shm_flags shm_perm.mode=0A=
@@ -62,6 +64,9 @@=0A=
#ifdef CONFIG_PROC_FS=0A=
create_proc_read_entry("sysvipc/shm", 0, 0, sysvipc_shm_read_proc, =
NULL);=0A=
#endif=0A=
+ shm_ids.kobj.parent =3D &ipc_subsys.kset.kobj; =0A=
+ sprintf(shm_ids.kobj.name, "%s", "shm");=0A=
+ kobject_register(&shm_ids.kobj);=0A=
}=0A=
=0A=
static inline int shm_checkid(struct shmid_kernel *s, int id)=0A=
@@ -234,6 +239,10 @@=0A=
return error;=0A=
}=0A=
=0A=
+/* Create a shared memory segment with given size and flags=0A=
+ * Returns negative result in case of failure=0A=
+ */=0A=
+=0A=
asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)=0A=
{=0A=
struct shmid_kernel *shp;=0A=
diff -Naur ipc/util.c ./../linux-2.5.74ff1/ipc/util.c=0A=
--- ipc/util.c 2003-07-02 22:46:12.000000000 +0200=0A=
+++ ./../linux-2.5.74ff1/ipc/util.c 2003-07-07 22:32:10.000000000 =
+0200=0A=
@@ -24,6 +24,7 @@=0A=
#include <linux/security.h>=0A=
#include <linux/rcupdate.h>=0A=
#include <linux/workqueue.h>=0A=
+#include <linux/kobject.h>=0A=
=0A=
#if defined(CONFIG_SYSVIPC)=0A=
=0A=
@@ -35,9 +36,10 @@=0A=
* The various system5 IPC resources (semaphores, messages and =
shared=0A=
* memory are initialised=0A=
*/=0A=
- =0A=
void __init ipc_init (void)=0A=
{=0A=
+ sprintf(ipc_subsys.kset.kobj.name, "%s", "ipc");=0A=
+ subsystem_register(&ipc_subsys);=0A=
sem_init();=0A=
msg_init();=0A=
shm_init();=0A=
@@ -196,6 +198,8 @@=0A=
rcu_read_lock();=0A=
spin_lock(&new->lock);=0A=
ids->entries[id].p =3D new;=0A=
+ kobject_register(&ids->entries[id].kobj);=0A=
+ =0A=
return id;=0A=
}=0A=
=0A=
@@ -432,12 +436,12 @@=0A=
* So far only shm_get_stat() calls ipc_get() via shm_get(), so =
ipc_get()=0A=
* is called with shm_ids.sem locked. Since grow_ary() is also called =
with=0A=
* shm_ids.sem down(for Shared Memory), there is no need to add read =
=0A=
- * barriers here to gurantee the writes in grow_ary() are seen in =
order =0A=
+ * barriers here to guarantee the writes in grow_ary() are seen in =
order =0A=
* here (for Alpha).=0A=
*=0A=
- * However ipc_get() itself does not necessary require ipc_ids.sem =
down. So=0A=
+ * However ipc_get() itself does not necessarily require ipc_ids.sem =
down. So=0A=
* if in the future ipc_get() is used by other places without =
ipc_ids.sem=0A=
- * down, then ipc_get() needs read memery barriers as ipc_lock() =
does.=0A=
+ * down, then ipc_get() needs read memory barriers as ipc_lock() =
does.=0A=
*/=0A=
struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id)=0A=
{=0A=
diff -Naur ipc/util.h ./../linux-2.5.74ff1/ipc/util.h=0A=
--- ipc/util.h 2003-07-02 22:49:13.000000000 +0200=0A=
+++ ./../linux-2.5.74ff1/ipc/util.h 2003-07-07 22:32:11.000000000 =
+0200=0A=
@@ -7,6 +7,7 @@=0A=
#define USHRT_MAX 0xffff=0A=
#define SEQ_MULTIPLIER (IPCMNI)=0A=
=0A=
+static struct subsystem ipc_subsys;=0A=
void sem_init (void);=0A=
void msg_init (void);=0A=
void shm_init (void);=0A=
@@ -19,9 +20,11 @@=0A=
unsigned short seq_max;=0A=
struct semaphore sem; =0A=
struct ipc_id* entries;=0A=
+ struct kobject kobj;=0A=
};=0A=
=0A=
struct ipc_id {=0A=
+ struct kobject kobj;=0A=
struct kern_ipc_perm* p;=0A=
};=0A=
=0A=
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