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ipc: constify ipc_ops

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There is no need to recreate the very same ipc_ops structure on every
kernel entry for msgget/semget/shmget.  Just declare it static and be
done with it.  While at it, constify it as we don't modify the structure
at runtime.

Found in the PaX patch, written by the PaX Team.

Signed-off-by: Mathias Krause <[email protected]>
Cc: PaX Team <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Manfred Spraul <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mathias Krause 2014-06-06 14:37:36 -07:00 • committed by Linus Torvalds
commit eb66ec44f8
5 changed files with 19 additions and 20 deletions
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10
ipc/sem.c
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@ -564,7 +564,11 @@ static inline int sem_more_checks(struct kern_ipc_perm *ipcp,
SYSCALL_DEFINE3(semget, key_t, key, int, nsems, int, semflg)
{
struct ipc_namespace *ns;
struct ipc_ops sem_ops;
static const struct ipc_ops sem_ops = {
.getnew = newary,
.associate = sem_security,
.more_checks = sem_more_checks,
};
struct ipc_params sem_params;
ns = current->nsproxy->ipc_ns;
@ -572,10 +576,6 @@ SYSCALL_DEFINE3(semget, key_t, key, int, nsems, int, semflg)
if (nsems < 0 || nsems > ns->sc_semmsl)
return -EINVAL;
sem_ops.getnew = newary;
sem_ops.associate = sem_security;
sem_ops.more_checks = sem_more_checks;
sem_params.key = key;
sem_params.flg = semflg;
sem_params.u.nsems = nsems;