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Message-Id: <169213670578.656151.9756083800563304743.b4-ty@chromium.org>
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
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