linux-kernel - Re: [PATCH -next V17 1/7] compiler_types.h: Add __noinstr

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Message-ID: <87ilesu9mr.fsf@all.your.base.are.belong.to.us>
Date:   Wed, 22 Mar 2023 15:46:20 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     guoren@...nel.org, arnd@...db.de, guoren@...nel.org,
        palmer@...osinc.com, tglx@...utronix.de, peterz@...radead.org,
        luto@...nel.org, conor.dooley@...rochip.com, heiko@...ech.de,
        jszhang@...nel.org, lazyparser@...il.com, falcon@...ylab.org,
        chenhuacai@...nel.org, apatel@...tanamicro.com,
        atishp@...shpatra.org, mark.rutland@....com, ben@...adent.org.uk,
        palmer@...belt.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Björn Töpel 
        <bjorn@...osinc.com>
Subject: Re: [PATCH -next V17 1/7] compiler_types.h: Add __noinstr_section()
 for noinstr

guoren@...nel.org writes:

> From: Lai Jiangshan <laijs@...ux.alibaba.com>
>
> Using __noinstr_section() doesn't automatically disable all
> instrumentations on the section. Inhibition for some
> instrumentations requires extra code. I.E. KPROBES explicitly
> avoids instrumenting on .noinstr.text.

Guo, the generic entry series doesn't apply cleanly on
riscv/for-next >6.2-rc1, and this patch is the issue.

Could you do a respin (potentially w/o this patch)?


Cheers,
Björn