linux-kernel - Re: [PATCH 1/7] x86/entry: Introduce __entry

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Date:   Wed, 11 May 2022 22:09:18 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Joerg Roedel <jroedel@...e.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Marco Elver <elver@...gle.com>, Hao Luo <haoluo@...gle.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH 1/7] x86/entry: Introduce __entry_text for entry code
 written in C

On Wed, May 11 2022 at 11:01, Nick Desaulniers wrote:
> On Wed, May 11, 2022 at 12:27 AM Lai Jiangshan <jiangshanlai@...il.com> wrote:
>>  /* Section for code which can't be instrumented at all */
>> -#define noinstr                                                                \
>> -       noinline notrace __attribute((__section__(".noinstr.text")))    \
>> -       __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
>> +#define __noinstr_section(section)                             \
>> +       noinline notrace __section(section) __no_profile        \
>> +       __no_kcsan __no_sanitize_address __no_sanitize_coverage
>> +
>> +#define noinstr __noinstr_section(".noinstr.text")
>
> I haven't looked at the rest of the series, but isn't `noinstr` used
> in a bunch of places? Wont this commit break all those uses or at
> least make it break bisection?

Why so?

This is still applying all the 'no' annotations and puts the code in
the very same section as before, no?

Thanks,

        tglx