• Arnd Bergmann's avatar
    mips: fix n32 compat_ipc_parse_version · 5a9372f7
    Arnd Bergmann authored
    While reading through the sysvipc implementation, I noticed that the n32
    semctl/shmctl/msgctl system calls behave differently based on whether
    o32 support is enabled or not: Without o32, the IPC_64 flag passed by
    user space is rejected but calls without that flag get IPC_64 behavior.
    
    As far as I can tell, this was inadvertently changed by a cleanup patch
    but never noticed by anyone, possibly nobody has tried using sysvipc
    on n32 after linux-3.19.
    
    Change it back to the old behavior now.
    
    Fixes: 78aaf956 ("MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.")
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
    Cc: linux-mips@vger.kernel.org
    Cc: stable@vger.kernel.org # 3.19+
    5a9372f7
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