openrisc: Define __ro_after_init to avoid crash
openrisc qemu tests fail with the following crash. Unable to handle kernel access at virtual address 0xc0300c34 Oops#: 0001 CPU #: 0 PC: c016c710 SR: 0000ae67 SP: c1017e04 GPR00: 00000000 GPR01: c1017e04 GPR02: c0300c34 GPR03: c0300c34 GPR04: 00000000 GPR05: c0300cb0 GPR06: c0300c34 GPR07: 000000ff GPR08: c107f074 GPR09: c0199ef4 GPR10: c1016000 GPR11: 00000000 GPR12: 00000000 GPR13: c107f044 GPR14: c0473774 GPR15: 07ce0000 GPR16: 00000000 GPR17: c107ed8a GPR18: 00009600 GPR19: c107f044 GPR20: c107ee74 GPR21: 00000003 GPR22: c0473770 GPR23: 00000033 GPR24: 000000bf GPR25: 00000019 GPR26: c046400c GPR27: 00000001 GPR28: c0464028 GPR29: c1018000 GPR30: 00000006 GPR31: ccf37483 RES: 00000000 oGPR11: ffffffff Process swapper (pid: 1, stackpage=c1001960) Stack: Stack dump [0xc1017cf8]: sp + 00: 0xc1017e04 sp + 04: 0xc0300c34 sp + 08: 0xc0300c34 sp + 12: 0x00000000 ... Bisect points to commit d2ec3f77 ("pty: make ptmx file ops read-only after init"). Fix by defining __ro_after_init for the openrisc architecture, similar to parisc. Fixes: d2ec3f77 ("pty: make ptmx file ops read-only after init") Cc: Kees Cook <keescook@chromium.org> Signed-off-by: NGuenter Roeck <linux@roeck-us.net> Acked-by: NStafford Horne <shorne@gmail.com>
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