linux-kernel - Re: [PATCH mm] kasan, powerpc: Don't rename memintrinsics if compiler adds prefixes

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Message-Id: <20230227141646.084c9a49fcae018852ca60f5@linux-foundation.org>
Date:   Mon, 27 Feb 2023 14:16:46 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Liam Howlett <liam.howlett@...cle.com>,
        kasan-dev@...glegroups.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Daniel Axtens <dja@...ens.net>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH mm] kasan, powerpc: Don't rename memintrinsics if
 compiler adds prefixes

On Mon, 27 Feb 2023 10:47:27 +0100 Marco Elver <elver@...gle.com> wrote:

> With appropriate compiler support [1], KASAN builds use __asan prefixed
> meminstrinsics, and KASAN no longer overrides memcpy/memset/memmove.
> 
> If compiler support is detected (CC_HAS_KASAN_MEMINTRINSIC_PREFIX),
> define memintrinsics normally (do not prefix '__').
> 
> On powerpc, KASAN is the only user of __mem functions, which are used to
> define instrumented memintrinsics. Alias the normal versions for KASAN
> to use in its implementation.
> 
> Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ [1]
> Link: https://lore.kernel.org/oe-kbuild-all/202302271348.U5lvmo0S-lkp@intel.com/
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Marco Elver <elver@...gle.com>

Seems this is a fix against "kasan: treat meminstrinsic as builtins in
uninstrumented files", so I'll plan to fold this patch into that patch.