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Date: Thu, 3 Feb 2022 12:45:49 -0800 From: Nick Desaulniers <ndesaulniers@...gle.com> To: Kees Cook <keescook@...omium.org> Cc: x86@...nel.org, Arvind Sankar <nivedita@...m.mit.edu>, Fangrui Song <maskray@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, Nathan Chancellor <nathan@...nel.org>, Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: Re: [PATCH v2] x86/build: don't build CONFIG_X86_32 as -ffreestanding On Thu, Feb 3, 2022 at 12:40 PM Kees Cook <keescook@...omium.org> wrote: > > From: Nick Desaulniers <ndesaulniers@...gle.com> > > -ffreestanding typically inhibits "libcall optimizations" where calls to > certain library functions can be replaced by the compiler in certain > cases to calls to other library functions that may be more efficient. > This can be problematic for embedded targets that don't provide full > libc implementations. While the bcmp shenanigans were ultimately resolved by commit 5f074f3e192f ("lib/string.c: implement a basic bcmp") (and this popped up again in commit 1e1b6d63d634 ("lib/string.c: implement stpcpy") ). I'm still very much in favor of this patch, and should have pursued it. Thanks for resending! -- Thanks, ~Nick Desaulniers
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