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arch: Reserve map_shadow_stack() syscall number for all architectures
commit c35559f ("x86/shstk: Introduce map_shadow_stack syscall") recently added support for map_shadow_stack() but it is limited to x86 only for now. There is a possibility that other architectures (namely, arm64 and RISC-V), that are implementing equivalent support for shadow stacks, might need to add support for it. Independent of that, reserving arch-specific syscall numbers in the syscall tables of all architectures is good practice and would help avoid future conflicts. map_shadow_stack() is marked as a conditional syscall in sys_ni.c. Adding it to the syscall tables of other architectures is harmless and would return ENOSYS when exercised. Note, map_shadow_stack() was assigned #453 during the merge process since torvalds#452 was taken by fchmodat2(). For Powerpc, map it to sys_ni_syscall() as is the norm for Powerpc syscall tables. For Alpha, map_shadow_stack() takes up torvalds#563 as Alpha still diverges from the common syscall numbering system in the other architectures. Link: https://lore.kernel.org/lkml/[email protected]/ Link: https://lore.kernel.org/lkml/[email protected]/ Signed-off-by: Sohil Mehta <[email protected]> Reviewed-by: Rick Edgecombe <[email protected]> Reviewed-by: Arnd Bergmann <[email protected]> Acked-by: Michael Ellerman <[email protected]> (powerpc) Acked-by: Catalin Marinas <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Arnd Bergmann <[email protected]>
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