linux-kernel - Re: [PATCH v2 1/3] compiler_types: Introduce the Clang __preserve

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Message-ID: <CANiq72=-o49qkW+mPW45P_+jbS2jO=5_qks14HOtzVOukb0Mpw@mail.gmail.com>
Date:   Sat, 5 Aug 2023 08:35:43 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Miguel Ojeda <ojeda@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...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 v2 1/3] compiler_types: Introduce the Clang
 __preserve_most function attribute

On Fri, Aug 4, 2023 at 11:06 AM Marco Elver <elver@...gle.com> wrote:
>
> will imply notrace. It is recommended to restrict use of the attribute
> to functions that should or already disable tracing.

Should the last sentence here be added into the code comment?

Apart from that this looks fine from a `compiler_attributes.h`
perspective (even if we are not there anymore):

Reviewed-by: Miguel Ojeda <ojeda@...nel.org>

Cheers,
Miguel