Sohil Mehta 2fd0ebad27 arch: Reserve map_shadow_stack() syscall number for all architectures ... commit c35559f94e ("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 #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 #563 as Alpha still diverges from the common syscall numbering system in the other architectures. Link: https://lore.kernel.org/lkml/20230515212255.GA562920@debug.ba.rivosinc.com/ Link: https://lore.kernel.org/lkml/b402b80b-a7c6-4ef0-b977-c0f5f582b78a@sirena.org.uk/ Signed-off-by: Sohil Mehta <sohil.mehta@intel.com> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>		2023-10-06 22:26:51 +02:00
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boot	alpha/boot/misc: trim unused declarations	2023-02-24 23:14:22 -05:00
configs	alpha: update config files	2023-02-14 12:37:18 -05:00
include	Kbuild updates for v6.6	2023-09-05 11:01:47 -07:00
kernel	arch: Reserve map_shadow_stack() syscall number for all architectures	2023-10-06 22:26:51 +02:00
lib	alpha: replace #include <asm/export.h> with #include <linux/export.h>	2023-08-22 18:12:46 +09:00
math-emu	alpha: move __udiv_qrnnd library function to arch/alpha/lib/	2021-09-18 14:45:48 -07:00
mm	mm/fault: convert remaining simple cases to lock_mm_and_find_vma()	2023-06-24 14:12:58 -07:00
Kbuild	kbuild: use more subdir- for visiting subdirectories while cleaning	2021-10-24 13:49:46 +09:00
Kconfig	mm/fault: convert remaining simple cases to lock_mm_and_find_vma()	2023-06-24 14:12:58 -07:00
Kconfig.debug
Makefile	kbuild: remove head-y syntax	2022-10-02 18:06:03 +09:00