• Arnd Bergmann's avatar
    ipc: rename old-style shmctl/semctl/msgctl syscalls · 275f2214
    Arnd Bergmann authored
    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: default avatarArnd Bergmann <arnd@arndb.de>
    275f2214
msg.c 30.5 KB