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Date: Tue, 1 Mar 2022 10:28:32 +0100 From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com> To: Nick Desaulniers <ndesaulniers@...gle.com> Cc: Dan Li <ashimida@...ux.alibaba.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Kees Cook <keescook@...omium.org>, Masahiro Yamada <masahiroy@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, Mark Rutland <mark.rutland@....com>, Sami Tolvanen <samitolvanen@...gle.com>, Nicholas Piggin <npiggin@...il.com>, Guenter Roeck <linux@...ck-us.net>, Masami Hiramatsu <mhiramat@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, Luc Van Oostenryck <luc.vanoostenryck@...il.com>, Marco Elver <elver@...gle.com>, linux-kernel <linux-kernel@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: Re: [PATCH] [PATCH v2] AARCH64: Add gcc Shadow Call Stack support On Mon, Feb 28, 2022 at 11:35 PM Nick Desaulniers <ndesaulniers@...gle.com> wrote: > > Or simply add a #define for __noscs to include/linux/compiler-gcc.h > with appropriate guard and leave the existing #ifndef in > include/linux/compiler_types.h as is. I'd prefer that when the > compilers differ in terms of feature detection since it's as explicit > as possible. The idea is to avoid differing here to begin with, i.e. to use the same code for both compilers (only whenever that is possible, of course), thus having a single `#define` in a single file. Do you think we will have to change in the future for some reason, thus needing to split it again? Cheers, Miguel
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