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SubjectRE: clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add clang support)
Hi Kees,

When I raised the question of whether we want to add support for "asm goto" in llvm I got some feedback from the community that "asm goto" might not be the best solution for the problem it was invented for (optimizing support for tracepoints), so I stopped perusing this issue.
I'm CC-ing the developers that participated in the original thread and a few developers that might be interested in adding support of "asm goto".
I'm also adding the llvm-dev mailing list, in case there are additional parties interested in voicing their opinion.

I hope this will give this issue a push forward and we will find a solution that will not prevent llvm from compiling linux kernel.


-----Original Message-----
From: Kees Cook []
Sent: Wednesday, February 14, 2018 02:29
To: David Woodhouse <>; Chandler Carruth <>; Yatsina, Marina <>
Cc: Guenter Roeck <>; X86 ML <>; LKML <>; Alan Cox <>; Rik van Riel <>; Andi Kleen <>; Josh Poimboeuf <>; Tom Lendacky <>; Peter Zijlstra <>; Linus Torvalds <>; Jiri Kosina <>; Andy Lutomirski <>; Hansen, Dave <>; Tim Chen <>; Greg Kroah-Hartman <>; Paul Turner <>; Stephen Hines <>; Nick Desaulniers <>
Subject: clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add clang support)

On Tue, Feb 13, 2018 at 4:10 PM, David Woodhouse <> wrote:
> We also need to resolve the asm-goto thing.

Yes, this is becoming much more urgent, assuming we'll be raising the minimum GCC version soon and drop support for lacking asm-goto...

Do you happen to know who the right people are to include to move the discussion forward? I know various kernel folks that are passionate about it, but I'm still getting to know who to talk with from llvm.

I see an earlier thread here:

It seems to end there? I'm still coming up to speed on it, so I'm likely missing other context.


Kees Cook
Pixel Security
Intel Israel (74) Limited

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