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authorArnd Bergmann <arnd@arndb.de>2019-01-01 00:22:40 +0300
committerArnd Bergmann <arnd@arndb.de>2019-01-25 19:22:50 +0300
commit275f22148e8720e84b180d9e0cdf8abfd69bac5b (patch)
treef7cb9810f8415904589d73a8d8f3c15b0bc70246 /include/linux/syscalls.h
parent73a66023c937ef258f2aa340cdb53ae7d8b1d47c (diff)
downloadlinux-275f22148e8720e84b180d9e0cdf8abfd69bac5b.tar.xz
ipc: rename old-style shmctl/semctl/msgctl syscalls
The behavior of these system calls is slightly different between architectures, as determined by the CONFIG_ARCH_WANT_IPC_PARSE_VERSION symbol. Most architectures that implement the split IPC syscalls don't set that symbol and only get the modern version, but alpha, arm, microblaze, mips-n32, mips-n64 and xtensa expect the caller to pass the IPC_64 flag. For the architectures that so far only implement sys_ipc(), i.e. m68k, mips-o32, powerpc, s390, sh, sparc, and x86-32, we want the new behavior when adding the split syscalls, so we need to distinguish between the two groups of architectures. The method I picked for this distinction is to have a separate system call entry point: sys_old_*ctl() now uses ipc_parse_version, while sys_*ctl() does not. The system call tables of the five architectures are changed accordingly. As an additional benefit, we no longer need the configuration specific definition for ipc_parse_version(), it always does the same thing now, but simply won't get called on architectures with the modern interface. A small downside is that on architectures that do set ARCH_WANT_IPC_PARSE_VERSION, we now have an extra set of entry points that are never called. They only add a few bytes of bloat, so it seems better to keep them compared to adding yet another Kconfig symbol. I considered adding new syscall numbers for the IPC_64 variants for consistency, but decided against that for now. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index fb63045a0fb6..938d8908b9e0 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -717,6 +717,7 @@ asmlinkage long sys_mq_getsetattr(mqd_t mqdes, const struct mq_attr __user *mqst
/* ipc/msg.c */
asmlinkage long sys_msgget(key_t key, int msgflg);
+asmlinkage long sys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp,
size_t msgsz, long msgtyp, int msgflg);
@@ -726,6 +727,7 @@ asmlinkage long sys_msgsnd(int msqid, struct msgbuf __user *msgp,
/* ipc/sem.c */
asmlinkage long sys_semget(key_t key, int nsems, int semflg);
asmlinkage long sys_semctl(int semid, int semnum, int cmd, unsigned long arg);
+asmlinkage long sys_old_semctl(int semid, int semnum, int cmd, unsigned long arg);
asmlinkage long sys_semtimedop(int semid, struct sembuf __user *sops,
unsigned nsops,
const struct __kernel_timespec __user *timeout);
@@ -734,6 +736,7 @@ asmlinkage long sys_semop(int semid, struct sembuf __user *sops,
/* ipc/shm.c */
asmlinkage long sys_shmget(key_t key, size_t size, int flag);
+asmlinkage long sys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg);
asmlinkage long sys_shmdt(char __user *shmaddr);