From: Uros Bizjak <ubizjak@gmail.com>
To: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@kernel.org>, Nadav Amit <namit@vmware.com>,
Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
kasan-dev@googlegroups.com
Subject: Re: [PATCH 4/4] x86/percpu: Use C for percpu read/write accessors
Date: Wed, 10 Apr 2024 13:21:23 +0200 [thread overview]
Message-ID: <CAFULd4aJd6YKXZr=AZ7yzNkiR4_DfL5soQSvhMhNiQEPUOS87g@mail.gmail.com> (raw)
In-Reply-To: <CA+fCnZen+5XC4LFYuzhdAjSjY_Jh0Yk=KYXxcYxkMDNj3kY9kA@mail.gmail.com>
On Wed, Apr 10, 2024 at 1:11 PM Andrey Konovalov <andreyknvl@gmail.com> wrote:
>
> On Mon, Oct 9, 2023 at 4:35 PM Uros Bizjak <ubizjak@gmail.com> wrote:
> >
> > On Mon, Oct 9, 2023 at 1:41 PM Ingo Molnar <mingo@kernel.org> wrote:
> > >
> > >
> > > * Uros Bizjak <ubizjak@gmail.com> wrote:
> > >
> > > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > > > index ecb256954351..1edf4a5b93ca 100644
> > > > --- a/arch/x86/Kconfig
> > > > +++ b/arch/x86/Kconfig
> > > > @@ -2393,7 +2393,7 @@ config CC_HAS_NAMED_AS
> > > >
> > > > config USE_X86_SEG_SUPPORT
> > > > def_bool y
> > > > - depends on CC_HAS_NAMED_AS && SMP
> > > > + depends on CC_HAS_NAMED_AS && SMP && !KASAN
> > > > + depends on CC_HAS_NAMED_AS && SMP && !KASAN
> > >
> > > So I'd rather express this as a Kconfig quirk line, and explain each quirk.
> > >
> > > Something like:
> > >
> > > depends on CC_HAS_NAMED_AS
> > > depends on SMP
> > > #
> > > # -fsanitize=kernel-address (KASAN) is at the moment incompatible
> > > # with named address spaces - see GCC bug #12345.
> > > #
> > > depends on !KASAN
> >
> > This is now PR sanitizer/111736 [1], but perhaps KASAN people [CC'd]
> > also want to be notified about this problem.
> >
> > [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111736
>
> Filed a KASAN bug to track this:
> https://bugzilla.kernel.org/show_bug.cgi?id=218703
Please note the fix in -tip tree that reenables sanitizers for fixed compilers:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/percpu&id=9ebe5500d4b25ee4cde04eec59a6764361a60709
Thanks,
Uros.
next prev parent reply other threads:[~2024-04-10 11:21 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-04 14:49 [PATCH 0/4] x86/percpu: Use segment qualifiers Uros Bizjak
2023-10-04 14:49 ` [PATCH 1/4] x86/percpu: Update arch/x86/include/asm/percpu.h to the current tip Uros Bizjak
2023-10-04 14:49 ` [PATCH 2/4] x86/percpu: Enable named address spaces with known compiler version Uros Bizjak
2023-10-05 7:20 ` [tip: x86/percpu] " tip-bot2 for Uros Bizjak
2023-10-04 14:49 ` [PATCH 3/4] x86/percpu: Use compiler segment prefix qualifier Uros Bizjak
2023-10-05 7:20 ` [tip: x86/percpu] " tip-bot2 for Nadav Amit
2023-10-04 14:49 ` [PATCH 4/4] x86/percpu: Use C for percpu read/write accessors Uros Bizjak
2023-10-04 16:37 ` Ingo Molnar
2023-10-04 16:40 ` Ingo Molnar
2023-10-04 19:23 ` [PATCH v2 " Uros Bizjak
2023-10-04 19:42 ` Linus Torvalds
2023-10-04 20:07 ` Uros Bizjak
2023-10-04 20:12 ` Linus Torvalds
2023-10-04 20:19 ` Linus Torvalds
2023-10-04 20:22 ` Uros Bizjak
2023-10-05 7:06 ` Ingo Molnar
2023-10-05 7:40 ` Uros Bizjak
2023-10-05 7:20 ` [tip: x86/percpu] " tip-bot2 for Uros Bizjak
2023-10-08 17:59 ` [PATCH 4/4] " Linus Torvalds
2023-10-08 19:17 ` Uros Bizjak
2023-10-08 20:13 ` Linus Torvalds
2023-10-08 20:48 ` Linus Torvalds
2023-10-08 21:41 ` Uros Bizjak
2023-10-09 11:41 ` Ingo Molnar
2023-10-09 11:51 ` Ingo Molnar
2023-10-09 12:00 ` Uros Bizjak
2023-10-09 12:20 ` Ingo Molnar
2023-10-09 12:21 ` Nadav Amit
2023-10-09 12:42 ` Uros Bizjak
2023-10-09 12:53 ` Nadav Amit
2023-10-09 12:27 ` Uros Bizjak
2023-10-09 14:35 ` Uros Bizjak
2024-04-10 11:11 ` Andrey Konovalov
2024-04-10 11:21 ` Uros Bizjak [this message]
2024-04-10 11:24 ` Andrey Konovalov
2023-10-09 11:42 ` Ingo Molnar
2023-10-10 6:37 ` Uros Bizjak
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