linux-kernel - Re: [PATCH v2 08/14] powerpc: Handle KCOV _

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Message-ID: <e50abba6c962772c73342bacf20fb87dc99dd542.camel@linux.ibm.com>
Date: Fri, 23 May 2025 15:24:30 +1000
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: Kees Cook <kees@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Michael Ellerman	
 <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy
	 <christophe.leroy@...roup.eu>,
        Naveen N Rao <naveen@...nel.org>,
        "Ritesh
 Harjani (IBM)" <ritesh.list@...il.com>,
        "Aneesh Kumar K.V"
 <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton	 <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org,
        "Gustavo A. R. Silva"
 <gustavoars@...nel.org>,
        Christoph Hellwig <hch@....de>, Marco Elver
 <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Andrey
 Ryabinin <ryabinin.a.a@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor
 <nathan@...nel.org>,
        Nicolas Schier	 <nicolas.schier@...ux.dev>,
        Nick
 Desaulniers <nick.desaulniers+lkml@...il.com>,
        Bill Wendling
 <morbo@...gle.com>,
        Justin Stitt <justinstitt@...gle.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, kasan-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
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        llvm@...ts.linux.dev
Subject: Re: [PATCH v2 08/14] powerpc: Handle KCOV __init vs inline
 mismatches

On Thu, 2025-05-22 at 21:39 -0700, Kees Cook wrote:
> When KCOV is enabled all functions get instrumented, unless
> the __no_sanitize_coverage attribute is used. To prepare for
> __no_sanitize_coverage being applied to __init functions, we have to
> handle differences in how GCC's inline optimizations get resolved.
> For
> s390 this requires forcing a couple functions to be inline with

I assume you mean powerpc here, though I'm sure my employer is happy
that you're at least confusing us with IBM's other architecture :)

-- 
Andrew Donnellan    OzLabs, ADL Canberra
ajd@...ux.ibm.com   IBM Australia Limited