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Message-ID: <CABCJKufNUoJJPcraG-o2AvTBSWmFEQAzg0z-Z=xLohBqsMA3KQ@mail.gmail.com> Date: Fri, 29 Apr 2022 18:00:03 -0700 From: Sami Tolvanen <samitolvanen@...gle.com> To: Peter Zijlstra <peterz@...radead.org> Cc: LKML <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, X86 ML <x86@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Joao Moreira <joao@...rdrivepizza.com>, Sedat Dilek <sedat.dilek@...il.com>, Steven Rostedt <rostedt@...dmis.org>, linux-hardening@...r.kernel.org, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, llvm@...ts.linux.dev Subject: Re: [RFC PATCH 16/21] objtool: Add support for CONFIG_CFI_CLANG On Fri, Apr 29, 2022 at 4:30 PM Peter Zijlstra <peterz@...radead.org> wrote: > Urgh, what does this do for decode speed? This is a hash-lookup for > every single instruction. Two actually, since .kcfi_traps only contains compiler-emitted locations and we also have to check for manual type annotations. I haven't measured performance yet, but I also didn't notice a significant impact here. > Is that kcfi location array sorted by the compiler? Because then you can > keep a running iterator and replace the whole lookup with a simple > equality comparison. The compiler generates a separate .kcfi_types section for each text section and the entries are emitted in order, so this should be doable. Sami
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