linux-kernel - Re: [PATCH v2] ARM: kprobes: move __kretprobe

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Message-ID: <YzN6rH6wOiC8a8sN@shell.armlinux.org.uk>
Date:   Tue, 27 Sep 2022 23:35:24 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>,
        sparkhuang <huangshaobo6@...wei.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, llvm@...ts.linux.dev,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        regressions@...ts.linux.dev, lkft-triage@...ts.linaro.org,
        Linux Kernel Functional Testing <lkft@...aro.org>,
        Logan Chien <loganchien@...gle.com>
Subject: Re: [PATCH v2] ARM: kprobes: move __kretprobe_trampoline to out of
 line assembler

On Tue, Sep 27, 2022 at 03:28:51PM -0700, Nick Desaulniers wrote:
> commit 1069c1dd20a3 ("ARM: 9231/1: Recover kretprobes return address for
> EABI stack unwinder")
> tickled a bug in clang's integrated assembler where the .save and .pad
> directives must have corresponding .fnstart directives. The integrated
> assembler is unaware that the compiler will be generating the .fnstart
> directive.

Has it been confirmed that gcc does generate a .fnstart for naked
functions?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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