linux-kernel - Re: [PATCH v4 1/4] compiler_types: Introduce the Clang __preserve

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Date:   Tue, 15 Aug 2023 14:58:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Miguel Ojeda <ojeda@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, llvm@...ts.linux.dev,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev@...glegroups.com, linux-toolchains@...r.kernel.org
Subject: Re: [PATCH v4 1/4] compiler_types: Introduce the Clang __preserve_most function attribute

On Fri, 11 Aug 2023 17:18:38 +0200, Marco Elver wrote:
> [1]: "On X86-64 and AArch64 targets, this attribute changes the calling
> convention of a function. The preserve_most calling convention attempts
> to make the code in the caller as unintrusive as possible. This
> convention behaves identically to the C calling convention on how
> arguments and return values are passed, but it uses a different set of
> caller/callee-saved registers. This alleviates the burden of saving and
> recovering a large register set before and after the call in the caller.
> If the arguments are passed in callee-saved registers, then they will be
> preserved by the callee across the call. This doesn't apply for values
> returned in callee-saved registers.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/4] compiler_types: Introduce the Clang __preserve_most function attribute
      https://git.kernel.org/kees/c/7a0fd5e16785
[2/4] list_debug: Introduce inline wrappers for debug checks
      https://git.kernel.org/kees/c/b16c42c8fde8
[3/4] list: Introduce CONFIG_LIST_HARDENED
      https://git.kernel.org/kees/c/aebc7b0d8d91
[4/4] hardening: Move BUG_ON_DATA_CORRUPTION to hardening options
      https://git.kernel.org/kees/c/aa9f10d57056

Take care,

-- 
Kees Cook