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Commit b2d75cdd authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by Linus Torvalds
Browse files

ipc: uninline some code from util.h 



ipc_lock_check_down(), ipc_lock_check() and ipcget() seem too large to be
inline.  Besides, they give no optimization being inline as they perform
calls inside in any case.

Moving them into ipc/util.c saves 500 bytes of vmlinux and shortens IPC
internal API.

$ ./scripts/bloat-o-meter vmlinux-orig vmlinux
add/remove: 3/2 grow/shrink: 0/10 up/down: 490/-989 (-499)
function                                     old     new   delta
ipcget                                         -     392    +392
ipc_lock_check_down                            -      49     +49
ipc_lock_check                                 -      49     +49
sys_semget                                   119     105     -14
sys_shmget                                   108      86     -22
sys_msgget                                   100      78     -22
do_msgsnd                                    665     631     -34
do_msgrcv                                    680     644     -36
do_shmat                                     771     733     -38
sys_msgctl                                  1302    1229     -73
ipcget_new                                    80       -     -80
sys_semtimedop                              1534    1452     -82
sys_semctl                                  2034    1922    -112
sys_shmctl                                  1919    1765    -154
ipcget_public                                322       -    -322

The ipcget() growth is the result of gcc inlining of currently static
ipcget_new/_public.

Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a46c9994

ipc/util.c

+53 −2
Original line number Diff line number Diff line
@@ -248,7 +248,7 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size) 
 *	This routine is called by sys_msgget, sys_semget() and sys_shmget()

 *	when the key is IPC_PRIVATE.

 */

int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,

static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,

		struct ipc_ops *ops, struct ipc_params *params)

{

	int err;
@@ -312,7 +312,7 @@ static int ipc_check_perms(struct kern_ipc_perm *ipcp, struct ipc_ops *ops, 
 *

 *	On success, the ipc id is returned.

 */

int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,

static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,

		struct ipc_ops *ops, struct ipc_params *params)

{

	struct kern_ipc_perm *ipcp;
@@ -710,6 +710,57 @@ struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *ids, int id) 
	return out;

}



struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id)

{

	struct kern_ipc_perm *out;



	out = ipc_lock_down(ids, id);

	if (IS_ERR(out))

		return out;



	if (ipc_checkid(out, id)) {

		ipc_unlock(out);

		return ERR_PTR(-EIDRM);

	}



	return out;

}



struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id)

{

	struct kern_ipc_perm *out;



	out = ipc_lock(ids, id);

	if (IS_ERR(out))

		return out;



	if (ipc_checkid(out, id)) {

		ipc_unlock(out);

		return ERR_PTR(-EIDRM);

	}



	return out;

}



/**

 * ipcget - Common sys_*get() code

 * @ns : namsepace

 * @ids : IPC identifier set

 * @ops : operations to be called on ipc object creation, permission checks

 *        and further checks

 * @params : the parameters needed by the previous operations.

 *

 * Common routine called by sys_msgget(), sys_semget() and sys_shmget().

 */

int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,

			struct ipc_ops *ops, struct ipc_params *params)

{

	if (params->key == IPC_PRIVATE)

		return ipcget_new(ns, ids, ops, params);

	else

		return ipcget_public(ns, ids, ops, params);

}



#ifdef __ARCH_WANT_IPC_PARSE_VERSION

ipc/util.h

+4 −56
Original line number Diff line number Diff line
@@ -131,10 +131,6 @@ int ipc_parse_version (int *cmd); 
extern void free_msg(struct msg_msg *msg);

extern struct msg_msg *load_msg(const void __user *src, int len);

extern int store_msg(void __user *dest, struct msg_msg *msg, int len);

extern int ipcget_new(struct ipc_namespace *, struct ipc_ids *,

			struct ipc_ops *, struct ipc_params *);

extern int ipcget_public(struct ipc_namespace *, struct ipc_ids *,

			struct ipc_ops *, struct ipc_params *);



static inline int ipc_buildid(int id, int seq)

{
@@ -163,57 +159,9 @@ static inline void ipc_unlock(struct kern_ipc_perm *perm) 
	rcu_read_unlock();

}



static inline struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids,

						int id)

{

	struct kern_ipc_perm *out;



	out = ipc_lock_down(ids, id);

	if (IS_ERR(out))

		return out;



	if (ipc_checkid(out, id)) {

		ipc_unlock(out);

		return ERR_PTR(-EIDRM);

	}



	return out;

}



static inline struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids,

						int id)

{

	struct kern_ipc_perm *out;



	out = ipc_lock(ids, id);

	if (IS_ERR(out))

		return out;



	if (ipc_checkid(out, id)) {

		ipc_unlock(out);

		return ERR_PTR(-EIDRM);

	}



	return out;

}



/**

 * ipcget - Common sys_*get() code

 * @ns : namsepace

 * @ids : IPC identifier set

 * @ops : operations to be called on ipc object creation, permission checks

 *        and further checks

 * @params : the parameters needed by the previous operations.

 *

 * Common routine called by sys_msgget(), sys_semget() and sys_shmget().

 */

static inline int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,

			struct ipc_ops *ops, struct ipc_params *params)

{

	if (params->key == IPC_PRIVATE)

		return ipcget_new(ns, ids, ops, params);

	else

		return ipcget_public(ns, ids, ops, params);

}

struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id);

struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);

int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,

			struct ipc_ops *ops, struct ipc_params *params);



#endif