From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Nathan Chancellor <nathan@kernel.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
stable@vger.kernel.org
Subject: Re: [PATCH] x86/boot/compressed: Disable jump tables for clang
Date: Wed, 24 Jun 2026 11:55:10 +0200 [thread overview]
Message-ID: <ajupfkcZTTxGP2dG@gmail.com> (raw)
In-Reply-To: <ajuoqIk4tSV7CmFC@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
> > I'm sitting on a patch to unconditionally disable jump-tables for
> > x86_64:
> >
> > https://web.git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=x86/syscall
>
> In particular:
>
> https://web.git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=x86/syscall&id=76612388fe7aa41a8eb88f890d451bc17255eda0
Side note: since arch/x86/boot/compressed/Makefile constructs
its own KBUILD_CFLAGS, so a change to that Makefile will still
be required to universally apply -fno-jump-tables and work
around this Clang optimization in the decompression code.
Thanks,
Ingo
prev parent reply other threads:[~2026-06-24 9:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-23 21:47 [PATCH] x86/boot/compressed: Disable jump tables for clang Nathan Chancellor
2026-06-24 9:36 ` Ingo Molnar
2026-06-24 9:38 ` Peter Zijlstra
2026-06-24 9:51 ` Ingo Molnar
2026-06-24 9:55 ` Ingo Molnar [this message]
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