alpha: Implement "current_stack_pointer"
To follow the existing per-arch conventions replace open-coded use of asm "$30" as "current_stack_pointer". This will let it be used in non-arch places (like HARDENED_USERCOPY). Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mike Rapoport <rppt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de> Cc: linux-alpha@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Matt Turner <mattst88@gmail.com>
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