Re: [tip: x86/asm] x86/asm: Make ASM_CALL_CONSTRAINT conditional on frame pointers
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- Subject: Re: [tip: x86/asm] x86/asm: Make ASM_CALL_CONSTRAINT conditional on frame pointers
- From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
- Date: Fri, 7 Mar 2025 15:21:57 -0800
- Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, tip-bot2 for Josh Poimboeuf <tip-bot2@xxxxxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, x86@xxxxxxxxxx
- In-reply-to: <Z8t7ubUE5P7woAr5@gmail.com>
- References: <174108458405.14745.4864877018394987266.tip-bot2@tip-bot2> <90B1074B-E7D4-4CE0-8A82-ADEB7BAED7AD@zytor.com> <Z8t7ubUE5P7woAr5@gmail.com>
On Sat, Mar 08, 2025 at 12:05:29AM +0100, Ingo Molnar wrote:
>
> * H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> > > #endif /* __ASSEMBLY__ */
> >
> > So we are going to be using this version despite the gcc maintainers
> > telling us it is not supported?
>
> No, neither patches are in the x86 tree at the moment.
FWIW, the existing ASM_CALL_CONSTRAINT is also not supported, so this
patch wouldn't have changed anything in that respect.
Regardless I plan to post a new patch set soon with a bunch of cleanups.
It will keep the existing ASM_CALL_CONSTRAINT in place for GCC, and will
use the new __builtin_frame_address(0) input constraint for Clang only.
There will be a new asm_call() interface to hide the mess.
--
Josh
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