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ipc: rename old-style shmctl/semctl/msgctl syscalls

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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>
This commit is contained in:
Arnd Bergmann
2018-12-31 22:22:40 +01:00
parent 73a66023c9
commit 275f22148e
14 changed files with 137 additions and 62 deletions
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6
arch/mips/kernel/syscalls/syscall_n32.tbl
View File

@@ -37,7 +37,7 @@
27 n32 madvise sys_madvise
28 n32 shmget sys_shmget
29 n32 shmat sys_shmat
30 n32 shmctl compat_sys_shmctl
30 n32 shmctl compat_sys_old_shmctl
31 n32 dup sys_dup
32 n32 dup2 sys_dup2
33 n32 pause sys_pause
@@ -71,12 +71,12 @@
61 n32 uname sys_newuname
62 n32 semget sys_semget
63 n32 semop sys_semop
64 n32 semctl compat_sys_semctl
64 n32 semctl compat_sys_old_semctl
65 n32 shmdt sys_shmdt
66 n32 msgget sys_msgget
67 n32 msgsnd compat_sys_msgsnd
68 n32 msgrcv compat_sys_msgrcv
69 n32 msgctl compat_sys_msgctl
69 n32 msgctl compat_sys_old_msgctl
70 n32 fcntl compat_sys_fcntl
71 n32 flock sys_flock
72 n32 fsync sys_fsync

6
arch/mips/kernel/syscalls/syscall_n64.tbl
View File

@@ -37,7 +37,7 @@
27 n64 madvise sys_madvise
28 n64 shmget sys_shmget
29 n64 shmat sys_shmat
30 n64 shmctl sys_shmctl
30 n64 shmctl sys_old_shmctl
31 n64 dup sys_dup
32 n64 dup2 sys_dup2
33 n64 pause sys_pause
@@ -71,12 +71,12 @@
61 n64 uname sys_newuname
62 n64 semget sys_semget
63 n64 semop sys_semop
64 n64 semctl sys_semctl
64 n64 semctl sys_old_semctl
65 n64 shmdt sys_shmdt
66 n64 msgget sys_msgget
67 n64 msgsnd sys_msgsnd
68 n64 msgrcv sys_msgrcv
69 n64 msgctl sys_msgctl
69 n64 msgctl sys_old_msgctl
70 n64 fcntl sys_fcntl
71 n64 flock sys_flock
72 n64 fsync sys_fsync