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Date:   Fri, 2 Nov 2018 19:59:07 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        dan.carpenter@...cle.com, adilger.kernel@...ger.ca,
        yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        rostedt@...dmis.org, mchehab+samsung@...nel.org, olof@...m.net,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        David Miller <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>, tglx@...utronix.de,
        Ingo Molnar <mingo@...nel.org>, paullawrence@...gle.com,
        sandipan@...ux.vnet.ibm.com, andreyknvl@...gle.com,
        David Woodhouse <dwmw2@...radead.org>, will.deacon@....com,
        Philippe Ombredanne <pombredanne@...b.com>,
        paul.burton@...s.com, rientjes@...gle.com, w@....eu,
        msebor@...il.com, Chris Li <sparse@...isli.org>,
        Jonathan Corbet <corbet@....net>,
        Theodore Ts'o <tytso@....edu>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>, joe@...ches.com,
        Arnd Bergmann <arnd@...db.de>, asmadeus@...ewreck.org,
        stefan@...er.ch, luc.vanoostenryck@...il.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-doc@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-sparse@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [GIT PULL] Compiler Attributes for v4.20-rc1



On 11/02/2018 07:11 PM, Linus Torvalds wrote:
> On Fri, Nov 2, 2018 at 6:16 AM Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
>>
>> On 11/02/2018 04:46 AM, Linus Torvalds wrote:
>>>
>>> So I _think_ the KASAN config should have a
>>>
>>>     depends on CC_IS_GCC && GCC_VERSION >= 40902
>>>
>>> on it, but maybe there is something I'm missing.
>>
>> I'd rather use cc-option instead of version check, since we also support clang.
> 
> That would be even better, but I thought the requirement for 4.9.2
> came not from the option existing, but because of some bugs getting
> fixed?

It looks unusual but -fsanitize=kernel-address really showed up only in 4.9.2.
It was actually backported from 5.0 branch to 4.9 for whatever reason.

> 
> But if we can do it without version checks, that would be lovely.
> 
>                     Linus
> 

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